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Ni-based supported catalyst was prepared by supercritical carbon dioxide deposition method using NiCl2 as precursor and carbon nanotubes (CNT) as carrier, and characterized by XRD, Raman, SEM, TEM, EDS and BET for its crystal structure, microstructure and pore structure. The effects of reaction temperature (55~75 ℃) and pressure (9~18 MPa) on the Ni loading (the mass fraction of Ni measured by ICP, the same below) of S-Ni-CNT were evaluated. The S-Ni-CNT was further used as cathode of Li-CO2 battery, followed by analysis on the electrochemical performance of the battery. The results showed that the S-Ni-CNT had a Ni loading of 3.61% under the optimal synthesis conditions of temperature 65 ℃ and pressure 18 MPa, showing excellent single-atom dispersion, with a specific surface area of 220.14 m2/g, which was only reduced by 13.6% compared with that of the CNT carrier (254.74 m2/g). The mesoporous structure of S-Ni-CNT accounted for 90%. At a current density of 100 mA/g, the discharge specific capacity of S-Ni-CNT battery could reach 16427 mA·h/g, at a current density of 300 mA/g, the discharge voltage platform was 2.67 V and the charge voltage platform was 3.85 V. At a density current of 500 mA/g, after the battery undergone 100 charge-discharge cycles, the voltage retention rate was 94%.
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| 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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