燃料化学学报（中英文）

Data title (V0.1)	Electrocatalytic oxygen evolution activity database of nickel and cobalt-based phosphides
Author’s name	LU Xinyu, WANG He, WANG Chao
Corresponding author’s name	WANG Chao
Data content description	This database contains the experimental oxygen evolution reaction (OER) results for a series of Ni and Co-based phosphides in alkaline electrolyte (1 mol/L KOH). These metal phosphides were synthesized via the solvothermal phosphidization method or the electrodeposition method. The OER activity was evaluated by linear sweep voltammetry (LSV) at scan rates lower than 5 mV/s, using a standard three-electrode setup with a saturated calomel electrode (SCE) as the reference electrode, a graphite rod as the counter electrode, and 1 mol/L KOH as the electrolyte at room temperature. Additionally, the cyclic voltammetry and impedance spectroscopy data for part of the Ni and Co-based phosphides are included, obtained under identical experimental conditions
Data generation time	2020-2025
Data volume	15.2 MB
Data format	.csv, .bin, .txt, .opj
Data source location	https://doi.org/10.57760/sciencedb.32783
Citation format of data	LU Xinyu, WANG He, WANG Chao. Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[J]. J Fuel Chem Technol, 2026, 54, 20250386. LU Xinyu, WANG He, WANG Chao . Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[DS/OL]. V1. Science Data Bank, 2025. https://doi.org/10.57760/sciencedb.32783. DOI:10.57760/sciencedb.32783.

Data title (V0.1)	Electrocatalytic oxygen evolution activity database of nickel and cobalt-based phosphides
Author’s name	LU Xinyu, WANG He, WANG Chao
Corresponding author’s name	WANG Chao
Data content description	This database contains the experimental oxygen evolution reaction (OER) results for a series of Ni and Co-based phosphides in alkaline electrolyte (1 mol/L KOH). These metal phosphides were synthesized via the solvothermal phosphidization method or the electrodeposition method. The OER activity was evaluated by linear sweep voltammetry (LSV) at scan rates lower than 5 mV/s, using a standard three-electrode setup with a saturated calomel electrode (SCE) as the reference electrode, a graphite rod as the counter electrode, and 1 mol/L KOH as the electrolyte at room temperature. Additionally, the cyclic voltammetry and impedance spectroscopy data for part of the Ni and Co-based phosphides are included, obtained under identical experimental conditions
Data generation time	2020-2025
Data volume	15.2 MB
Data format	.csv, .bin, .txt, .opj
Data source location	https://doi.org/10.57760/sciencedb.32783
Citation format of data	LU Xinyu, WANG He, WANG Chao. Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[J]. J Fuel Chem Technol, 2026, 54, 20250386. LU Xinyu, WANG He, WANG Chao . Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[DS/OL]. V1. Science Data Bank, 2025. https://doi.org/10.57760/sciencedb.32783. DOI:10.57760/sciencedb.32783.

Label	Crystalline phase	η₁₀ /mV	Tafel slope /(mV·dec⁻¹)	Electrochemical active atoms /(mol·cm⁻²)	C_dl /(mF·cm⁻²)	R_ct /Ω
NiP-1	Ni₂P	310	42	6.48×10⁻⁷	−	−
NiP-2	Ni₂P	263	40	4.84×10⁻⁷	−	−
NiP-3	Ni₂P	243	30	3.73×10⁻⁷	−	0.85
NiP-4	Ni₂P	270	43	2.84×10⁻⁷	−	−
NiP-5	Ni₂P	350	97	8.70×10⁻⁷	−	2.16
NiP-6	Ni₂P	300	86	1.29×10⁻⁶	−	1.39
NiP-7	amorphous	317	108	9.90×10⁻⁷	−	0.89
NiP-8	Ni₂P	300	145	1.65×10⁻³	2.22	4.99
NiP-9	Ni₂P	283	92	3.48×10⁻⁴	2.01	3.16
NiP-10	Ni₂P	240	57	2.1×10⁻⁴	2.14	2.69
NiP-11	Ni₂P	270	63	1.4×10⁻⁴	1.90	2.82
NiP-12	Ni₂P	215	31	−	60.34	0.33
NiP-13	Ni₂P	310	67	−	80.72	2.08
NiP-14	NiCoP	248	49	4.1×10⁻⁷	6.6	1.21
NiP-15	Ni₂P	293	99	1.8×10⁻⁷	2.1	1.71
NiP-16	NiCoP	302	77	8.3×10⁻⁸	4.6	1.39
NiP-17	Ni₂P	335	138	6.45×10⁻⁴	−	3.50
NiP-18	Ni₂P	399	151	2.01×10⁻⁴	−	10.60
NiP-19	Ni₂P	502	200	1.02×10⁻⁴	−	25.90
NiP-20	amorphous	230	63	−	2.7	0.56
NiP-21	amorphous	312	168	−	9.8	3.20
NiP-22	amorphous	317	120	−	85.2	−
NiP-23	amorphous	277	64	−	183.6	−
NiP-24	amorphous	320	73	−	220.1	−
NiP-25	amorphous	350	102	−	332.9	−
NiP-26	amorphous	382	122	−	142.2	−
CoP-1	Co₂P	275	115	−	5.3	1.26
CoP-2	Co₂P	232	92	−	3.2	0.19
CoP-3	Co₂P	248	83	−	4.8	1.14
CoP-4	Co₂P	262	87	−	5.1	1.30
CoP-5	Co₂P	270	112	−	3.8	0.28
CoP-6	Co₂P	292	128	−	3.7	0.33
CoP-7	amorphous	301	142	−	4.6	0.30
CoP-8	amorphous	363	135	−	354.9	−
CoP-9	Co₂P	300	119	1.76×10⁻³	21.44	2.31
CoP-10	Co₂P	240	53	1.59×10⁻³	9.07	0.62
CoP-11	Co₂P	340	85	3.9×10⁻⁷	4.8	5.09

Label	Crystalline phase	η₁₀ /mV	Tafel slope /(mV·dec⁻¹)	Electrochemical active atoms /(mol·cm⁻²)	C_dl /(mF·cm⁻²)	R_ct /Ω
NiP-1	Ni₂P	310	42	6.48×10⁻⁷	−	−
NiP-2	Ni₂P	263	40	4.84×10⁻⁷	−	−
NiP-3	Ni₂P	243	30	3.73×10⁻⁷	−	0.85
NiP-4	Ni₂P	270	43	2.84×10⁻⁷	−	−
NiP-5	Ni₂P	350	97	8.70×10⁻⁷	−	2.16
NiP-6	Ni₂P	300	86	1.29×10⁻⁶	−	1.39
NiP-7	amorphous	317	108	9.90×10⁻⁷	−	0.89
NiP-8	Ni₂P	300	145	1.65×10⁻³	2.22	4.99
NiP-9	Ni₂P	283	92	3.48×10⁻⁴	2.01	3.16
NiP-10	Ni₂P	240	57	2.1×10⁻⁴	2.14	2.69
NiP-11	Ni₂P	270	63	1.4×10⁻⁴	1.90	2.82
NiP-12	Ni₂P	215	31	−	60.34	0.33
NiP-13	Ni₂P	310	67	−	80.72	2.08
NiP-14	NiCoP	248	49	4.1×10⁻⁷	6.6	1.21
NiP-15	Ni₂P	293	99	1.8×10⁻⁷	2.1	1.71
NiP-16	NiCoP	302	77	8.3×10⁻⁸	4.6	1.39
NiP-17	Ni₂P	335	138	6.45×10⁻⁴	−	3.50
NiP-18	Ni₂P	399	151	2.01×10⁻⁴	−	10.60
NiP-19	Ni₂P	502	200	1.02×10⁻⁴	−	25.90
NiP-20	amorphous	230	63	−	2.7	0.56
NiP-21	amorphous	312	168	−	9.8	3.20
NiP-22	amorphous	317	120	−	85.2	−
NiP-23	amorphous	277	64	−	183.6	−
NiP-24	amorphous	320	73	−	220.1	−
NiP-25	amorphous	350	102	−	332.9	−
NiP-26	amorphous	382	122	−	142.2	−
CoP-1	Co₂P	275	115	−	5.3	1.26
CoP-2	Co₂P	232	92	−	3.2	0.19
CoP-3	Co₂P	248	83	−	4.8	1.14
CoP-4	Co₂P	262	87	−	5.1	1.30
CoP-5	Co₂P	270	112	−	3.8	0.28
CoP-6	Co₂P	292	128	−	3.7	0.33
CoP-7	amorphous	301	142	−	4.6	0.30
CoP-8	amorphous	363	135	−	354.9	−
CoP-9	Co₂P	300	119	1.76×10⁻³	21.44	2.31
CoP-10	Co₂P	240	53	1.59×10⁻³	9.07	0.62
CoP-11	Co₂P	340	85	3.9×10⁻⁷	4.8	5.09

Label	Mass content/%		Atomic content/%
NiP-1	28.8	−	−	71.2	17.8	−	−	82.2
NiP-2	19.2	0.7	−	80.2	11.3	0.4	−	88.3
NiP-3	16.2	5.8	−	78.0	9.6	3.6	−	86.8
NiP-4	15.0	7.7	−	77.3	9.0	4.8	−	86.3
NiP-5	71.3	−	−	28.8	57.0	−	−	43.0
NiP-6	50.0	−	−	50.0	34.8	−	−	65.2
NiP-7	32.1	−	−	67.9	20.2	−	−	79.8
NiP-8	79.3	−	−	20.7	67.2	−	−	32.8
NiP-9	46.4	13.3	−	40.0	16.99	5.0	−	27.2
NiP-10	72.0	13.8	−	14.2	63.8	12.7	−	23.5
NiP-11	60.4	23.4	−	16.2	52.6	21.1	−	26.3
NiP-12	68.2	13.5	−	18.3	58.6	11.99	−	29.44
NiP-13	36.6	−	−	63.4	23.6	−	−	76.4
NiP-14	25.3	12.2	25.7	36.7	19.2	9.6	19.2	52.1
NiP-15	43.5	20.1	−	36.4	32.9	15.7	−	51.4
NiP-16	27.5	23.6	−	48.9	19.1	17	−	63.8
NiP-17	56.3	−	−	43.7	40.8	−	−	59.2
NiP-18	33.4	−	−	66.6	21.2	−	−	78.8
NiP-19	23.6	−	−	76.4	14.2	−	−	85.8
NiP-20	47.9	33.5	−	18.6	40.8	29.6	−	29.6
NiP-21	83.7	−	−	16.3	73.3	−	−	26.7
NiP-22	14.8	−	13.9	71.3	9.1	−	8.4	82.4
NiP-23	15.0	−	13.5	71.5	9.3	−	8.2	82.6
NiP-24	15.2	−	13.6	71.2	9.4	−	8.3	82.3
NiP-25	15.3	−	13.2	71.5	9.4	−	8.0	82.5
NiP-26	15.5	−	12.0	72.3	9.5	−	7.3	83.2
CoP-1	−	−	75.0	25.0	−	−	61.2	38.8
CoP-2	−	27.7	41.6	30.7	−	22.6	32.2	45.2
CoP-3	−	18.9	56.6	24.5	−	16.1	46.0	37.9
CoP-4	−	4.2	75.3	20.5	−	3.7	63.4	32.9
CoP-5	−	−	53.4	46.6	−	−	37.6	62.4
CoP-6	−	−	73.6	26.4	−	−	59.4	40.6
CoP-7	−	−	74.0	26.0	−	−	59.9	40.1
CoP-8	−	−	22.2	77.8	−	−	13.0	87.0
CoP-9	−	−	81.0	19.0	−	−	69.2	30.8
CoP-10	−	11.2	81.2	7.6	−	10.9	75.5	13.6
CoP-11	−	5.1	55.4	39.5	−	3.9	40.8	55.3

Label	Mass content/%		Atomic content/%
NiP-1	28.8	−	−	71.2	17.8	−	−	82.2
NiP-2	19.2	0.7	−	80.2	11.3	0.4	−	88.3
NiP-3	16.2	5.8	−	78.0	9.6	3.6	−	86.8
NiP-4	15.0	7.7	−	77.3	9.0	4.8	−	86.3
NiP-5	71.3	−	−	28.8	57.0	−	−	43.0
NiP-6	50.0	−	−	50.0	34.8	−	−	65.2
NiP-7	32.1	−	−	67.9	20.2	−	−	79.8
NiP-8	79.3	−	−	20.7	67.2	−	−	32.8
NiP-9	46.4	13.3	−	40.0	16.99	5.0	−	27.2
NiP-10	72.0	13.8	−	14.2	63.8	12.7	−	23.5
NiP-11	60.4	23.4	−	16.2	52.6	21.1	−	26.3
NiP-12	68.2	13.5	−	18.3	58.6	11.99	−	29.44
NiP-13	36.6	−	−	63.4	23.6	−	−	76.4
NiP-14	25.3	12.2	25.7	36.7	19.2	9.6	19.2	52.1
NiP-15	43.5	20.1	−	36.4	32.9	15.7	−	51.4
NiP-16	27.5	23.6	−	48.9	19.1	17	−	63.8
NiP-17	56.3	−	−	43.7	40.8	−	−	59.2
NiP-18	33.4	−	−	66.6	21.2	−	−	78.8
NiP-19	23.6	−	−	76.4	14.2	−	−	85.8
NiP-20	47.9	33.5	−	18.6	40.8	29.6	−	29.6
NiP-21	83.7	−	−	16.3	73.3	−	−	26.7
NiP-22	14.8	−	13.9	71.3	9.1	−	8.4	82.4
NiP-23	15.0	−	13.5	71.5	9.3	−	8.2	82.6
NiP-24	15.2	−	13.6	71.2	9.4	−	8.3	82.3
NiP-25	15.3	−	13.2	71.5	9.4	−	8.0	82.5
NiP-26	15.5	−	12.0	72.3	9.5	−	7.3	83.2
CoP-1	−	−	75.0	25.0	−	−	61.2	38.8
CoP-2	−	27.7	41.6	30.7	−	22.6	32.2	45.2
CoP-3	−	18.9	56.6	24.5	−	16.1	46.0	37.9
CoP-4	−	4.2	75.3	20.5	−	3.7	63.4	32.9
CoP-5	−	−	53.4	46.6	−	−	37.6	62.4
CoP-6	−	−	73.6	26.4	−	−	59.4	40.6
CoP-7	−	−	74.0	26.0	−	−	59.9	40.1
CoP-8	−	−	22.2	77.8	−	−	13.0	87.0
CoP-9	−	−	81.0	19.0	−	−	69.2	30.8
CoP-10	−	11.2	81.2	7.6	−	10.9	75.5	13.6
CoP-11	−	5.1	55.4	39.5	−	3.9	40.8	55.3

镍基及钴基磷化物碱性电催化析氧反应数据集

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卢欣宇 ¹ , 武江红 ² , 王鹤 ³^,^* , 王超 ¹^,^*

燃料化学学报（中英文） | 2026,54(6): 20250386-1195-20250386-1201

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燃料化学学报（中英文） 2026 , 54 (6) : 20250386-1195 -20250386-1201

镍基及钴基磷化物碱性电催化析氧反应数据集

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卢欣宇¹, 武江红², 王鹤³^,^*, 王超¹^,^*

作者信息

¹内蒙古工业大学新能源学院, 内蒙古鄂尔多斯 017010

²山西能源学院能源化学与材料工程系, 山西晋中 030600

³中国科学院山西煤炭化学研究所煤炭高效低碳利用全国重点实验室, 山西太原 030001

通讯作者:

王鹤, 王超

A dataset of nickel and cobalt based phosphides for the application of electrocatalytic oxygen evolution reaction in alkaline solution

Xinyu LU¹, Jianghong WU², He WANG³^,^*, Chao WANG¹^,^*

Affiliations

¹School of Renewable Energy, Inner Mongolia University of Technology, Ordos 017010, China

²Department of Energy Chemistry and Materials Engineering, Shanxi Institute of Energy, Jinzhong 030600, China

³Institute of Coal Chemistry, Chinese Academy of Sciences, State Key Laboratory of Coal Conversion, Taiyuan 030001, China

Corresponding Author:

Tel: 19946235450, 15227479902, E-mail: wanghe@sxicc.ac.cn

cwang@imut.edu.cn

出版时间: 2026-06-10 doi: 10.1016/S1872-5813(26)60675-5

文章导航

摘要

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氢能作为能源载体是缓解化石燃料使用带来的环境问题的有前景的解决方案。开发高效且廉价的碱性析氧电催化剂对加速碱性水电解槽的广泛应用至关重要。过渡金属磷化物有望成为高活性且稳定的析氧催化剂。此数据集收集并比较了镍和钴基磷化物的电催化析氧反应活性。数据集中的金属磷化物样品由溶剂热磷化或电沉积技术合成，并使用线性扫描伏安法在1 mol/L KOH中评估了这些磷化物的析氧活性。此外，还对这些金属磷化物进行了循环伏安法和电化学阻抗谱分析。数据集大小为14.5 MB，包含312个文件。此数据集的数据能够为设计高性能金属磷化物电催化剂提供实验依据。

关键词

磷化镍 / 磷化钴 / 析氧反应 / 碱性

Abstract

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Hydrogen as the energy carrier is a promising solution to mitigate the environmental issues associated with the use of fossil fuels. Efficient and inexpensive electrocatalysts for oxygen evolution in alkaline media are crucial for advancing the widespread application of alkaline water electrolyzers for hydrogen generation. Transition metal phosphides are promising candidates as the (pre-)catalysts for electrocatalytic oxygen evolution reactions. This dataset compiles and compares the electrocatalytic oxygen evolution reaction activity of nickel- and cobalt-based phosphides. The metal phosphides reported were synthesized using solvothermal phosphidization or electrodeposition methods, and the oxygen evolution activities of these phosphides were evaluated using linear sweep voltammetry in 1 mol/L KOH. Besides, cyclic voltammetry and electrochemical impedance spectroscopy were performed on these metal phosphides. The total volume of this dataset is 14.5 MB, comprising 312 files. It serves as a valuable reference for the design of active metal phosphide-based materials for electrocatalysis.

Key words

nickel phosphide / cobalt phosphide / oxygen evolution reaction / alkaline solution

引用本文

卢欣宇, 武江红, 王鹤, 王超. 镍基及钴基磷化物碱性电催化析氧反应数据集. 燃料化学学报（中英文）, 2026 , 54 (6) : 20250386-1195 -20250386-1201 . DOI: 10.1016/S1872-5813(26)60675-5

Xinyu LU, Jianghong WU, He WANG, Chao WANG. A dataset of nickel and cobalt based phosphides for the application of electrocatalytic oxygen evolution reaction in alkaline solution[J]. Journal of Fuel Chemistry and Technology, 2026 , 54 (6) : 20250386-1195 -20250386-1201 . DOI: 10.1016/S1872-5813(26)60675-5

正文

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Hydrogen is among the most promising energy carriers to address the potential energy crisis and reduce environmental pollution caused by the utilization of fossil fuels. Producing hydrogen via water electrolysis can utilize the intermittent electricity generated from wind, solar, tidal, or other renewable energy sources. In contrast to the hydrogen evolution reaction that happens at the cathode of water electrolyzers, the oxygen evolution reaction (OER) requires consecutive transfer of four electrons, coupled with proton transfer, leading to sluggish kinetics. Therefore, active electrocatalysts are required to accelerate the kinetics of OER^[1−2].

Transition metal phosphides (TMPs) exhibit high electrical conductivity and abundant electrocatalytic active sites, making them ideal (pre-)electrocatalysts for OER^[3]. When used to electrocatalyze OER in alkaline media, the surface of metal phosphides undergoes restructuring to form metal oxides and oxyhydroxides, which are the actual active species for OER. The in situ formed metal phosphide core and oxide/oxyhydroxide shell offer abundant active sites, and introduce electronic interaction to achieve high OER activities^[4].

The synthesis of metal phosphides often relies on high temperature calcination using NaH₂PO₂ as the phosphorus source. Under elevated temperature ( > 623 K), excessive phosphine gas is generated to react with the precursors. This high temperature calcination synthesis method is undesirable, as the phosphine gas is toxic, and mixed phases of the metal phosphides are frequently formed. To address these limitations, our group developed a low-temperature solvothermal phosphidization method, where metal-organic framework (MOF) precursors are reacted with white phosphorus to generate metal phosphides^[2−4]. The key advantages of this solvothermal phosphidization method are that metal phosphide nanoparticles can be synthesized at a lower temperature (< 473 K), and that the morphology of MOF precursors is preserved in metal phosphides. Furthermore, the structural features of the generated metal phosphide nanostructures can be readily tuned by altering the reactant ratio, solvent, ligand of the MOF, reaction temperature, etc. In addition, we have developed an alternative room-temperature electrodeposition method for preparing amorphous multi-metallic transition metal phosphides^[5].

This dataset reports the experimental electrocatalytic OER activity of a series of Ni and Co-based phosphides synthesized via solvothermal phosphidization or electrodeposition method, and can providing a reference to facilitate the future design of metal phosphide-based materials for electrocatalysis.

1　Main part

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1.1　Data profile

Table 1 lists the detailed information of this dataset, including the title, authors, data generation time, data format etc.

1.2　Data value

The dataset presents here is generated from a systematic study of the Ni and Co-based phosphides towards the electrocatalytic OER in alkaline media. The phosphides were synthesized using low-temperature solvothermal method or an electrodeposition method. The data serve as the benchmark for the OER activity of metal phosphide-type materials (Table 2), with the corresponding compositions detailed in Table 3. In Table 2, key parameters in evaluating the OER performance of electrocatalysts are given, including overpotential at 10 mA/cm² (η₁₀), Tafel slope, number of electrochemically active atoms, double layer capacitance (C_dl), and charge transfer resistance (R_ct). The η₁₀ is a widely accepted parameter in the area of OER. A lower η₁₀ indicates superior OER activity. Tafel slope and R_ct values are related to the OER kinetics. Generally, lower Tafel slope values and R_ct values indicate the more favorable kinetics and thus higher catalytic OER activity. Besides, the mechanism of OER can be inferred from the Tafel slope values. The number of electrochemically active atoms and C_dl are related to the number of active sites of the catalysts. Furthermore, users can use the data to compare the OER activity of metal phosphides that are synthesized with variations in methods, surface structures, metal doping, crystallinity and other properties. The format of these data includes .bin (original data file generated using CHI software), .opj (Origin project file), .txt (text file), and .csv (spreadsheet file), which can be easily plotted to compare with the user’s experimental results. Through activity comparison and key electrochemical parameter analyses, reasons for the inferior or superior OER activity can be inferred to aid the rational design of more efficient metal phosphide-based electrocatalysts for alkaline OER reaction.

1.3　Data generation method or process

The data were generated using a CHI 660E potentiostat, with the corresponding software developed by the company. The original data was stored as .bin format. To generate the data, metal phosphide nanostructures were synthesized using the solvothermal phosphidization or electrodeposition method described later. For the samples synthesized using the solvothermal phosphidization method, the working electrode was prepared by drop-casting of an ink that contains the metal phosphide samples. The substrate used was a piece of cleaned nickel foam or carbon paper. Inks were prepared by dispersing certain amounts of powdery sample in water or water/ethanol mixed solvent, with 1% Nafion ionomer added as the binder.

After sonication for 20 min, appropriate amounts of inks were dropped onto the substrate surface to cover 1 cm² geometric area, to achieve the loading of the metal phosphide on the electrode surface at about 1 mg/cm². For the samples synthesized using the electrodeposition method, no ink was required to prepare the working electrode, as the electrodeposition method was used to generate a thin layer of metal phosphides at the substrate surface with good adhesion. The loading for the electrodeposited film is higher, typically at around 2 mg/cm². The OER activity was measured, and cyclic voltammogram (CV) and electrochemical impedance spectroscopy were performed using the three electrode setup. Approximately 1 cm² geometric surface area of the working electrode was immersed in the 1 mol/L KOH electrolyte. The counter electrode was a cleaned graphite rod, and the reference electrode was a saturated calomel electrode (SCE). The electrochemical measurements were carried out at room temperature. The CV was scanned for 20 cycles in the potential region of 0−0.6 V vs. SCE to activate the working electrode till a stable CV was acquired. Then anodic or cathodic linear sweep voltammetry (LSV) was applied at 1, 2 or 5 mV/s covering the OER region. The overpotential of OER at a certain current density was acquired following the Equation (1),

$ \mathrm{\eta =} \mathit{E} _{ \mathrm{RHE}} \mathrm{-1.229} $

(1)

where E_RHE is the acquire potential in the reversible hydrogen scale and 1.229 V is the standard redox potential for OER. The Tafel slope value (b) is acquired by plotting the LSV curve in the OER region following Equation (2),

$ \mathrm{\eta =} \mathit{b} \mathrm{log} \mathit{j} \mathrm+ \mathit{a} $

(2)

where a is a constant, and j is the current density. To acquire the number of electrochemically active sites (n), CV at 50 mV/s is acquired covering the redox of Ni^2+/3+ peaks or Co^2+/3+ peaks. The total charge (Q) for the reduction peak is integrated. Following Equation (3), n can be acquired.

$ \mathit{n} \mathrm= \mathit{Q} \mathrm{/} \mathit{zF} $

(3)

where F is the Faraday constant, and z is the number of electrons transferred in the redox processes (assumed to be 1). In some cases where the redox peaks are unable to be identified, the C_dl was used to estimate the number of surface active sites. CVs in the non-Faradaic region were collected at different scan rates. By plotting the difference between anodic current and cathodic current against the scan rate, the slope yields the C_dl value. The electrochemical impedance data were acquired at the applied potential corresponding to the η at 10 mA/cm², with the alternating potential amplitude at 10 mV and the frequency range in 10⁵−0.01 Hz. The solution resistance ranged from 0.5 to 1 Ω, and the LSV data were iR-corrected using the solution resistance value for each sample. The R_ct value is acquired from the impedance data.

The crystallinity of the metal phosphides was acquired using a Rigaku Smartlab 9 kW Diffraction System using a Cu Kα source (λ = 0.15406 nm). The composition of the metal phosphides was determined using the inductively coupled plasma-atomic emission spectroscopy (ICP-AES) with an iCAP 7400 analyzer. The measurement conditions are as follows: forward power 1350 W, plasma gas flow rate 12.0 L/min, nebulizer gas flow rate 1.0 L/min, auxiliary gas flow rate 1.0 L/min, sample uptake speed 50 r/min with white/orange Tygon tubing. A concentric nebulizer was used with a cyclonic spray chamber. ICP-AES analysis was performed without an internal standard. Each value was measured three times, and the results are reported in the form of mass ratio and atomic ratio in Table 3.

1.4　Data sample description

The data provided in this database include LSV, CV, and electrochemical impedance data. For NiP-1 to NiP-19, CoP-1 to CoP-7 and CoP-9 to CoP-11, the samples were synthesized using the solvothermal phosphidization method^{[1−4,6−9]}. These samples are powdery with nanostructures. The general procedure of this solvothermal phosphidization method is as follows: MOF (0.2 g) was dispersed in 30 mL N, N-dimethylformamide (DMF). Then 0.15 g white phosphorus (P₄) was added, and the suspension was transferred into a 50 mL Teflon-lined stainless-steel autoclave. The autoclave was heated at 160 °C for 14 h, and the black precipitates were collected, washed with water, ethanol, and benzene, and dried. All these samples were synthesized following this typical procedure with slight modification as detailed below. NiP-1 to NiP-4 were prepared with NiFe-BTC (trimesic acid) MOF, where different amounts of Ni and Fe exist in the MOF. NiP-6, NiP-7 and NiP-8 were prepared by reacting 0.1 g Ni-BTC MOF with 0.025, 0.065 and 0.105 g P₄, respectively. NiP-9 to NiP-11 were heterostructures of Ni₂P/FeOOH, where Ni₂P was formed using the solvothermal phosphidization method using 0.1 g Ni-BTC MOF and 0.065 g P₄. Then, 0.02 g Ni₂P was dispersed in 20 mL of water and ethanol with 0.17, 1.33 and 6.67 mg/mL FeCl₃ 6H₂O for 4 h at room temperature to form NiP-9, NiP-10 and NiP-11, respectively. NiP-12 and NiP-13 were synthesized using NiFe-BTC-MOF and Ni-BTC MOF with 0.6 mmol P₄ at 180 °C for 12 h. NiP-14, NiP-15 and NiP-16 were synthesized using 0.3 g FeCoNi-BPDC (biphenyl-4,4′-dicarboxylic acid)-MOF, NiFe-BPDC-MOF, and NiCo-BPDC-MOF, respectively, and 0.27 g P₄. NiP-17, NiP-18 and NiP-19 were synthesized using 0.1 g Ni-BDC (1,4-dicarboxybenzene), Ni-BPDC and Ni-NDC (2,6-naphthalenedicarboxylic acid) MOF, respectively, with 0.065 g P₄. CoP-1 to CoP-4 were synthesized using CoFe-BTC-MOF with different Co to Fe ratios, with 0.09 g P₄ in DMF/ethylene glycol (v∶v = 1) solvent at 170 °C for 16 h. CoP-5, CoP-6 and CoP-7 were synthesized using Co-BTC-MOF with 0.09 g P₄ in DMF/ethanol, DMF and DMF/glycerol (v∶v = 1) solvents, respectively, at 170 °C for 16 h. CoP-9 and CoP-10 were prepared using 0.085 g Co-BTC MOF and CoFe-BTC MOF, respectively, at 170 °C for 14 h. CoP-11 was prepared using 0.3 g CoFe-MOF with 0.27 g P₄ at 160 °C for 16 h.

For NiP-20 to NiP-26 and CoP-8, the samples were synthesized via electrodeposition from aqueous electrolytes containing metal ions and sodium hypophosphite^[5,10]. Samples are thin film at the surface of conductive substrates. The general procedure for electrodeposition is as follows. A three-electrode setup was used with a conductive substrate nickel foam or carbon cloth (1 cm²) as the working electrode. The counter electrode was a cleaned graphite rod, and the reference electrode was SCE. The CV method was used to deposit the metal phosphide layers. For NiP-20 and NiP-21, the electrolytes consisted of 0.025 mol/L Ni(NO₃)₂ + 0.025 mol/L Fe(NO₃)₃ + 0.25 mol/L NaH₂PO₂ and 0.025 mol/L Ni(NO₃)₂ + 0.25 mol/L NaH₂PO₂, respectively. CV scan of −0.3−(−1) vs. SCE was applied at 5 mV/s for 8 cycles. For NiP-22 to NiP-26, the electrolyte was 0.04 mol/L Ni(NO₃)₂ + 0.01 mol/L Co(NO₃)₂ + 0.25 mol/L CH₃COONa + 0.25 mol/L NaH₂PO₂. CV scans of −0.3− (−1) vs. SCE were applied at 5 mV/s for 5, 10, 15, 20 and 25 cycles over NiP-22, NiP-23, NiP-24, NiP-25 and NiP-26, respectively.

Analysis of these data reveals several correlations. For nickel phosphides with the Ni₂P crystalline phase (NiP-5 to NiP-7), moderate crystallinity exhibits the optimum OER activity. Incorporation of Fe increases the OER activity, and the optimum extent of Fe incorporation lies in 30%−40% (NiP-1 to NiP-4, NiP-12 to NiP-13, CoP-1 to CoP-4 and CoP-9 and CoP-10). Deviation from this optimal Fe content, either higher or lower, compromises OER activity by affecting the OER kinetics, as observed by the increased Tafel slope and R_ct values. Forming Ni₂P/Fe(O)OH heterointerface can enhance the OER activity (NiP-8 to NiP-11), with an optimum thickness of the surface Fe(O)OH layer, reflected by the atomic percentage of Fe (NiP-10). Compared to samples from solvothermal phosphidation, metal phosphides prepared via electrodeposition usually exhibits higher C_dl values, which probably due to more uniform electrode surface coverage and higher specific surface area.

1.5　Data quality

To ensure the reliability and repeatability of sample preparation, all these samples were synthesized at least three times, and the electrochemical measurements were performed using different batches of samples. The reported results represent the average activity performance of these phosphides. In the three electrode tests, the pH value of the electrolyte was measured using a pH value meter, and the reference electrode potential was calibrated against a new SCE before and after each test. The overpotential values and R_ct are reported as the average from more than three independent tests.

1.6　Data usage methods and suggestions

It is recommended that when using these data, users should first identify the synthesis method before making a fair comparison, as the surface states of powder-based and electrodeposited working electrode differ significantly. Typically, metal phosphides synthesized via the solvothermal phosphidization method exhibit a higher surface phosphorus content. Furthermore, when comparing with OER activity data generated from other sources, attention should be paid to the key variables including the synthetic method, test temperature, electrolyte, active material loading, and the composition. The data provided in the .bin file are directly generated without any post-treatment. Some data is provided in the .opj file, where the potential is adjusted to the RHE scale, and where iR-compensation is applied. For convenience and optimal comparability, data in the .opj file are preferably recommended.

2　Conclusion

收起

A database of the OER activity of Ni and Co-based metal phosphides is constructed based on experimental results. The dataset encompasses phosphides synthesized via solvothermal phosphidization and electrodeposition methods. It provides key electrocatalytic parameters, and enables the analysis of the influence of metal doping, solvothermal condition (solvent and precursors), and crystallinity on the OER activity. This dataset can serve as as a benchmark for evaluating Ni and Co-based phosphide materials for alkaline OER, and provides a foundation for designing more active metal phosphide-based electrocatalysts through comparative analysis. The metal phosphides reported in this dataset can be potentially applied as electrocatalytic materials for other critical reactions, including hydrogen evolution, alcohol oxidation, and carbon dioxide reduction reactions, which are vital for energy conversion devices such as fuel cells, electrolyzers, and metal-air batteries. In addition, these nanostructured metal phosphides can be applied as the electrode materials in lithium or sodium ion batteries, and as protective anticorrosion coating on metal surface protection.

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XING Y, LIU S, LIU Y, et al. Construction of nickel phosphide/iron oxyhydroxide heterostructure nanoparticles for oxygen evolution[J]. Nano Energy, 2024, 123: 109402.

WANG C, CHAI L, LUO C, et al. Solvothermal preparation of nickel-iron phosphides hollow nanospheres derived from metal-organic frameworks for water oxidation reaction[J]. Appl Surf Sci, 2021, 540: 148336.

WANG C, CHAI L, CUI X, et al. Amorphous/crystalline heterostructured nickel phosphide nanospheres for electrocatalytic water and methanol oxidation reactions[J]. J Phys Chem C, 2021, 125(39): 21443−21452.

LIU S, CUI X, WANG Q, et al. Iron and oxygen codoped cobalt phosphide solvothermally prepared from a metal–organic framework for oxygen evolution[J]. J Phys Chem C, 2022, 126(36): 15205−15214.

WANG C, WU Y, ZHOU Z, et al. Electrodeposited amorphous nickel–iron phosphide and sulfide derived films for electrocatalytic oxygen evolution[J]. Int J Hydrog Energy, 2022, 47(97): 40849−40859.

GAO J, LIU S, LI Z, et al. Cobalt phosphide nanoparticles synthesized by solvothermal phosphidization of metal‐organic frameworks for electrocatalytic oxygen evolution[J]. Int J Energy Res, 2023, 2023(1): 3893229.

TONG J, XING Y, XIAO X, et al. Iron-doped cobalt phosphide nanowires prepared via one-step solvothermal phosphidization of metal–organic frameworks for the oxygen evolution reactions[J]. Green Chem, 2024, 26(9): 5308−5325.

WANG Z, LIU S, DU J, et al. Iron-doped nickel phosphide hollow nanospheres synthesized by solvothermal phosphidization of layered double hydroxides for electrocatalytic oxygen evolution[J]. Green Chem, 2024, 26(13): 7779−7788.

LIU X, HU Z, XING P, et al. Construction of iron-doped nickel cobalt phosphide nanoparticles via solvothermal phosphidization and their application in alkaline oxygen evolution[J]. J Colloid Interface Sci, 2025, 677: 441−451.

CHAI L, LIU S, PEI S, et al. Electrodeposited amorphous cobalt-nickel-phosphide-derived films as catalysts for electrochemical overall water splitting[J]. Chem Eng J, 2021, 420: 129686.

2026年第54卷第6期

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doi: 10.1016/S1872-5813(26)60675-5

接收时间：2025-12-03
首发时间：2026-09-23
出版时间：2026-06-10

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收稿日期：2025-12-03
修回日期：2025-12-27
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¹内蒙古工业大学新能源学院, 内蒙古鄂尔多斯 017010

²山西能源学院能源化学与材料工程系, 山西晋中 030600

³中国科学院山西煤炭化学研究所煤炭高效低碳利用全国重点实验室, 山西太原 030001

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
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Data title (V0.1)	Electrocatalytic oxygen evolution activity database of nickel and cobalt-based phosphides
Author’s name	LU Xinyu, WANG He, WANG Chao
Corresponding author’s name	WANG Chao
Data content description	This database contains the experimental oxygen evolution reaction (OER) results for a series of Ni and Co-based phosphides in alkaline electrolyte (1 mol/L KOH). These metal phosphides were synthesized via the solvothermal phosphidization method or the electrodeposition method. The OER activity was evaluated by linear sweep voltammetry (LSV) at scan rates lower than 5 mV/s, using a standard three-electrode setup with a saturated calomel electrode (SCE) as the reference electrode, a graphite rod as the counter electrode, and 1 mol/L KOH as the electrolyte at room temperature. Additionally, the cyclic voltammetry and impedance spectroscopy data for part of the Ni and Co-based phosphides are included, obtained under identical experimental conditions
Data generation time	2020-2025
Data volume	15.2 MB
Data format	.csv, .bin, .txt, .opj
Data source location	https://doi.org/10.57760/sciencedb.32783
Citation format of data	LU Xinyu, WANG He, WANG Chao. Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[J]. J Fuel Chem Technol, 2026, 54, 20250386. LU Xinyu, WANG He, WANG Chao . Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[DS/OL]. V1. Science Data Bank, 2025. https://doi.org/10.57760/sciencedb.32783. DOI:10.57760/sciencedb.32783.

Data title (V0.1)

Electrocatalytic oxygen evolution activity database of nickel and cobalt-based phosphides

Author’s name

LU Xinyu, WANG He, WANG Chao

Corresponding author’s name

WANG Chao

Data content description

This database contains the experimental oxygen evolution reaction (OER) results for a series of Ni and Co-based phosphides in alkaline electrolyte (1 mol/L KOH). These metal phosphides were synthesized via the solvothermal phosphidization method or the electrodeposition method. The OER activity was evaluated by linear sweep voltammetry (LSV) at scan rates lower than 5 mV/s, using a standard three-electrode setup with a saturated calomel electrode (SCE) as the reference electrode, a graphite rod as the counter electrode, and 1 mol/L KOH as the electrolyte at room temperature. Additionally, the cyclic voltammetry and impedance spectroscopy data for part of the Ni and Co-based phosphides are included, obtained under identical experimental conditions

Data generation time

2020-2025

Data volume

15.2 MB

Data format

.csv, .bin, .txt, .opj

Data source location

https://doi.org/10.57760/sciencedb.32783

Citation format of data

LU Xinyu, WANG He, WANG Chao. Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[J]. J Fuel Chem Technol, 2026, 54, 20250386.
LU Xinyu, WANG He, WANG Chao . Electrocatalytic oxygen evolution activity databased of nickel and cobalt-based phosphides[DS/OL]. V1. Science Data Bank, 2025. https://doi.org/10.57760/sciencedb.32783. DOI:10.57760/sciencedb.32783.

Label	Crystalline phase	η₁₀ /mV	Tafel slope /(mV·dec⁻¹)	Electrochemical active atoms /(mol·cm⁻²)	C_dl /(mF·cm⁻²)	R_ct /Ω
NiP-1	Ni₂P	310	42	6.48×10⁻⁷	−	−
NiP-2	Ni₂P	263	40	4.84×10⁻⁷	−	−
NiP-3	Ni₂P	243	30	3.73×10⁻⁷	−	0.85
NiP-4	Ni₂P	270	43	2.84×10⁻⁷	−	−
NiP-5	Ni₂P	350	97	8.70×10⁻⁷	−	2.16
NiP-6	Ni₂P	300	86	1.29×10⁻⁶	−	1.39
NiP-7	amorphous	317	108	9.90×10⁻⁷	−	0.89
NiP-8	Ni₂P	300	145	1.65×10⁻³	2.22	4.99
NiP-9	Ni₂P	283	92	3.48×10⁻⁴	2.01	3.16
NiP-10	Ni₂P	240	57	2.1×10⁻⁴	2.14	2.69
NiP-11	Ni₂P	270	63	1.4×10⁻⁴	1.90	2.82
NiP-12	Ni₂P	215	31	−	60.34	0.33
NiP-13	Ni₂P	310	67	−	80.72	2.08
NiP-14	NiCoP	248	49	4.1×10⁻⁷	6.6	1.21
NiP-15	Ni₂P	293	99	1.8×10⁻⁷	2.1	1.71
NiP-16	NiCoP	302	77	8.3×10⁻⁸	4.6	1.39
NiP-17	Ni₂P	335	138	6.45×10⁻⁴	−	3.50
NiP-18	Ni₂P	399	151	2.01×10⁻⁴	−	10.60
NiP-19	Ni₂P	502	200	1.02×10⁻⁴	−	25.90
NiP-20	amorphous	230	63	−	2.7	0.56
NiP-21	amorphous	312	168	−	9.8	3.20
NiP-22	amorphous	317	120	−	85.2	−
NiP-23	amorphous	277	64	−	183.6	−
NiP-24	amorphous	320	73	−	220.1	−
NiP-25	amorphous	350	102	−	332.9	−
NiP-26	amorphous	382	122	−	142.2	−
CoP-1	Co₂P	275	115	−	5.3	1.26
CoP-2	Co₂P	232	92	−	3.2	0.19
CoP-3	Co₂P	248	83	−	4.8	1.14
CoP-4	Co₂P	262	87	−	5.1	1.30
CoP-5	Co₂P	270	112	−	3.8	0.28
CoP-6	Co₂P	292	128	−	3.7	0.33
CoP-7	amorphous	301	142	−	4.6	0.30
CoP-8	amorphous	363	135	−	354.9	−
CoP-9	Co₂P	300	119	1.76×10⁻³	21.44	2.31
CoP-10	Co₂P	240	53	1.59×10⁻³	9.07	0.62
CoP-11	Co₂P	340	85	3.9×10⁻⁷	4.8	5.09

Label

Crystalline phase

η₁₀
/mV

Tafel slope
/(mV·dec⁻¹)

Electrochemical active atoms
/(mol·cm⁻²)

C_dl
/(mF·cm⁻²)

R_ct
/Ω

NiP-1

Ni₂P

310

6.48×10⁻⁷

−

NiP-2

Ni₂P

263

4.84×10⁻⁷

−

NiP-3

Ni₂P

243

3.73×10⁻⁷

−

0.85

NiP-4

Ni₂P

270

2.84×10⁻⁷

−

NiP-5

Ni₂P

350

8.70×10⁻⁷

−

2.16

NiP-6

Ni₂P

300

1.29×10⁻⁶

−

1.39

NiP-7

amorphous

317

108

9.90×10⁻⁷

−

0.89

NiP-8

Ni₂P

300

145

1.65×10⁻³

2.22

4.99

NiP-9

Ni₂P

283

3.48×10⁻⁴

2.01

3.16

NiP-10

Ni₂P

240

2.1×10⁻⁴

2.14

2.69

NiP-11

Ni₂P

270

1.4×10⁻⁴

1.90

2.82

NiP-12

Ni₂P

215

−

60.34

0.33

NiP-13

Ni₂P

310

−

80.72

2.08

NiP-14

NiCoP

248

4.1×10⁻⁷

6.6

1.21

NiP-15

Ni₂P

293

1.8×10⁻⁷

2.1

1.71

NiP-16

NiCoP

302

8.3×10⁻⁸

4.6

1.39

NiP-17

Ni₂P

335

138

6.45×10⁻⁴

−

3.50

NiP-18

Ni₂P

399

151

2.01×10⁻⁴

−

10.60

NiP-19

Ni₂P

502

200

1.02×10⁻⁴

−

25.90

NiP-20

amorphous

230

−

2.7

0.56

NiP-21

amorphous

312

168

−

9.8

3.20

NiP-22

amorphous

317

120

−

85.2

−

NiP-23

amorphous

277

−

183.6

−

NiP-24

amorphous

320

−

220.1

−

NiP-25

amorphous

350

102

−

332.9

−

NiP-26

amorphous

382

122

−

142.2

−

CoP-1

Co₂P

275

115

−

5.3

1.26

CoP-2

Co₂P

232

−

3.2

0.19

CoP-3

Co₂P

248

−

4.8

1.14

CoP-4

Co₂P

262

−

5.1

1.30

CoP-5

Co₂P

270

112

−

3.8

0.28

CoP-6

Co₂P

292

128

−

3.7

0.33

CoP-7

amorphous

301

142

−

4.6

0.30

CoP-8

amorphous

363

135

−

354.9

−

CoP-9

Co₂P

300

119

1.76×10⁻³

21.44

2.31

CoP-10

Co₂P

240

1.59×10⁻³

9.07

0.62

CoP-11

Co₂P

340

3.9×10⁻⁷

4.8

5.09

Label	Mass content/%		Atomic content/%
NiP-1	28.8	−	−	71.2	17.8	−	−	82.2
NiP-2	19.2	0.7	−	80.2	11.3	0.4	−	88.3
NiP-3	16.2	5.8	−	78.0	9.6	3.6	−	86.8
NiP-4	15.0	7.7	−	77.3	9.0	4.8	−	86.3
NiP-5	71.3	−	−	28.8	57.0	−	−	43.0
NiP-6	50.0	−	−	50.0	34.8	−	−	65.2
NiP-7	32.1	−	−	67.9	20.2	−	−	79.8
NiP-8	79.3	−	−	20.7	67.2	−	−	32.8
NiP-9	46.4	13.3	−	40.0	16.99	5.0	−	27.2
NiP-10	72.0	13.8	−	14.2	63.8	12.7	−	23.5
NiP-11	60.4	23.4	−	16.2	52.6	21.1	−	26.3
NiP-12	68.2	13.5	−	18.3	58.6	11.99	−	29.44
NiP-13	36.6	−	−	63.4	23.6	−	−	76.4
NiP-14	25.3	12.2	25.7	36.7	19.2	9.6	19.2	52.1
NiP-15	43.5	20.1	−	36.4	32.9	15.7	−	51.4
NiP-16	27.5	23.6	−	48.9	19.1	17	−	63.8
NiP-17	56.3	−	−	43.7	40.8	−	−	59.2
NiP-18	33.4	−	−	66.6	21.2	−	−	78.8
NiP-19	23.6	−	−	76.4	14.2	−	−	85.8
NiP-20	47.9	33.5	−	18.6	40.8	29.6	−	29.6
NiP-21	83.7	−	−	16.3	73.3	−	−	26.7
NiP-22	14.8	−	13.9	71.3	9.1	−	8.4	82.4
NiP-23	15.0	−	13.5	71.5	9.3	−	8.2	82.6
NiP-24	15.2	−	13.6	71.2	9.4	−	8.3	82.3
NiP-25	15.3	−	13.2	71.5	9.4	−	8.0	82.5
NiP-26	15.5	−	12.0	72.3	9.5	−	7.3	83.2
CoP-1	−	−	75.0	25.0	−	−	61.2	38.8
CoP-2	−	27.7	41.6	30.7	−	22.6	32.2	45.2
CoP-3	−	18.9	56.6	24.5	−	16.1	46.0	37.9
CoP-4	−	4.2	75.3	20.5	−	3.7	63.4	32.9
CoP-5	−	−	53.4	46.6	−	−	37.6	62.4
CoP-6	−	−	73.6	26.4	−	−	59.4	40.6
CoP-7	−	−	74.0	26.0	−	−	59.9	40.1
CoP-8	−	−	22.2	77.8	−	−	13.0	87.0
CoP-9	−	−	81.0	19.0	−	−	69.2	30.8
CoP-10	−	11.2	81.2	7.6	−	10.9	75.5	13.6
CoP-11	−	5.1	55.4	39.5	−	3.9	40.8	55.3

Label

Mass content/%

Atomic content/%

NiP-1

28.8

−

71.2

17.8

−

82.2

NiP-2

19.2

0.7

−

80.2

11.3

0.4

−

88.3

NiP-3

16.2

5.8

−

78.0

9.6

3.6

−

86.8

NiP-4

15.0

7.7

−

77.3

9.0

4.8

−

86.3

NiP-5

71.3

−

28.8

57.0

−

43.0

NiP-6

50.0

−

50.0

34.8

−

65.2

NiP-7

32.1

−

67.9

20.2

−

79.8

NiP-8

79.3

−

20.7

67.2

−

32.8

NiP-9

46.4

13.3

−

40.0

16.99

5.0

−

27.2

NiP-10

72.0

13.8

−

14.2

63.8

12.7

−

23.5

NiP-11

60.4

23.4

−

16.2

52.6

21.1

−

26.3

NiP-12

68.2

13.5

−

18.3

58.6

11.99

−

29.44

NiP-13

36.6

−

63.4

23.6

−

76.4

NiP-14

25.3

12.2

25.7

36.7

19.2

9.6

19.2

52.1

NiP-15

43.5

20.1

−

36.4

32.9

15.7

−

51.4

NiP-16

27.5

23.6

−

48.9

19.1

−

63.8

NiP-17

56.3

−

43.7

40.8

−

59.2

NiP-18

33.4

−

66.6

21.2

−

78.8

NiP-19

23.6

−

76.4

14.2

−

85.8

NiP-20

47.9

33.5

−

18.6

40.8

29.6

−

29.6

NiP-21

83.7

−

16.3

73.3

−

26.7

NiP-22

14.8

−

13.9

71.3

9.1

−

8.4

82.4

NiP-23

15.0

−

13.5

71.5

9.3

−

8.2

82.6

NiP-24

15.2

−

13.6

71.2

9.4

−

8.3

82.3

NiP-25

15.3

−

13.2

71.5

9.4

−

8.0

82.5

NiP-26

15.5

−

12.0

72.3

9.5

−

7.3

83.2

CoP-1

−

75.0

25.0

−

61.2

38.8

CoP-2

−

27.7

41.6

30.7

−

22.6

32.2

45.2

CoP-3

−

18.9

56.6

24.5

−

16.1

46.0

37.9

CoP-4

−

4.2

75.3

20.5

−

3.7

63.4

32.9

CoP-5

−

53.4

46.6

−

37.6

62.4

CoP-6

−

73.6

26.4

−

59.4

40.6

CoP-7

−

74.0

26.0

−

59.9

40.1

CoP-8

−

22.2

77.8

−

13.0

87.0

CoP-9

−

81.0

19.0

−

69.2

30.8

CoP-10

−

11.2

81.2

7.6

−

10.9

75.5

13.6

CoP-11

−

5.1

55.4

39.5

−

3.9

40.8

55.3