Uncovering charge transport dynamics and electrostatic storage origin for high-energy-density polymer films through configuration-tailored PDA@KNb<sub>3</sub>O<sub>8</sub>

Uncovering charge transport dynamics and electrostatic storage origin for high-energy-density polymer films through configuration-tailored PDA@KNb₃O₈

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Ziyue Wang^a^,^b, Jiajun Zhu^a, Jiyang Xie^a^,^c^,^*, Chengding Gu^a^,^c^,^**, Wanbiao Hu^a^,^b^,^c^,^d^,^***

Journal of Materiomics | 2026, 12(2) : 101120

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Journal of Materiomics | 2026, 12(2): 101120

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Uncovering charge transport dynamics and electrostatic storage origin for high-energy-density polymer films through configuration-tailored PDA@KNb₃O₈

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Ziyue Wang^a^,^b, Jiajun Zhu^a, Jiyang Xie^a^,^c^,^*, Chengding Gu^a^,^c^,^**, Wanbiao Hu^a^,^b^,^c^,^d^,^***

Affiliations

^aYunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China

^bSouthwest United Graduate School, Kunming 650092, China

^cElectron Microscopy Center, Yunnan University, Kunming 650091, China

^dSchool of Engineering, Yunnan University, Kunming 650091, China

Published: 2026-03-20 doi: 10.1016/j.jmat.2025.101120

Outline

Abstract

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Tuning the structure-activity of fillers and matrix is crucial for designing polymer-based dielectric capacitors with high energy storage performance. Up to date, how the fillers' structural characteristics (surface/interface configurations, dimensions, orientations etc.) contribute to the overall energy storage is far from unveiled. To this end, a combined filler-polymer dual-side design strategy is developed, which involves the DFT guidance for the electronic transport criteria for the designable synthesis of KNb₃O₈ fillers. Four different structural configurations are constructed, which are surface-modified with polydopamine (PDA) to fabricate the final composite films, i.e. PDA@KNb₃O₈/PVDF-P(VDF-HFP)-PMMA with particular orientations and arrangements, through a well-controlled solution casting method. Comprehensive structural and electrical investigations reveal that 1D/2D-orientated PDA@KNb₃O₈ fillers could obviously enhance the breakdown field and energy storage performance. The difference is that the 1D fillers more effectively improve the energy efficiency (up to 72%), while the 2D fillers more steadily achieve high energy density (U_e = 28.35 J/cm³) among the highest U_e reported for the composites. This work not only uncovers the structural origin of the electrostatic storage in inorganic-polymer composite films but also provides critical insights in designing high-energy-density film capacitors.

Key words

Polymer-based composites / Energy storage / KNb₃O₈ / Morphology regulation / Orientation distribution

Cite this Article

Ziyue Wang, Jiajun Zhu, Jiyang Xie, Chengding Gu, Wanbiao Hu. Uncovering charge transport dynamics and electrostatic storage origin for high-energy-density polymer films through configuration-tailored PDA@KNb₃O₈[J]. Journal of Materiomics, 2026 , 12 (2) : 101120 - . DOI: 10.1016/j.jmat.2025.101120

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Funding

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Natural Science Foundation of China(22175150; 52402204; 52362037)
Yunnan Fundamental Research Projects(202401AT070473; 202501AV070011)

Appendix

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Year 2026 volume 12 Issue 2

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Article Info

doi: 10.1016/j.jmat.2025.101120

Receive Date：2025-05-30
Online Date：2026-08-13
Published：2026-03-20

Article Data

Affiliations

History

Received：2025-05-30
Revised：2025-07-06
Accepted：2025-07-10

Funding

Natural Science Foundation of China(22175150; 52402204; 52362037)

Yunnan Fundamental Research Projects(202401AT070473; 202501AV070011)

Affiliations

^bSouthwest United Graduate School, Kunming 650092, China

^cElectron Microscopy Center, Yunnan University, Kunming 650091, China

^dSchool of Engineering, Yunnan University, Kunming 650091, China

Corresponding:

^* Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China. E-mail addresses: xiejiyang@ynu.edu.cn (J. Xie)

^** Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China. chengdinggu@ynu.edu.cn (C. Gu)

^*** Yunnan Key Laboratory of Electromagnetic Materials and Devices, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China. huwanbiao@ynu.edu.cn (W. Hu).

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表12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
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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