Full
Outline
Supercapacitors，as a new type of energy storage device between traditional capacitors and secondary batteries，show broad application prospects in many fields. In this study，graphene oxide （GO） is prepared by the Hummers method，and ZIF-8 with a regular dodecahedral structure is grown in-situ. Then，the ZnSe@rGO nanocomposite is successfully prepared via the chemical vapor deposition （CVD） method. SEM images show that the ZnSe@rGO nanocomposite has a regular dodecahedral structure. ZnSe grows along a layer of yarn-like rGO surface and exhibits good crystallization performance. BET tests indicate that the specific surface area of ZnSe@rGO is 57.36 m²·g-1，which is larger than that of ZIF-8@GO. Electrochemical performance tests of the samples show that，in 3 mol·L-1 KOH solution，the ZnSe@rGO nanocomposite has a high specific capacitance of 971.4 F·g-1 at a current density of 1 A·g-1，confirming the material has good pseudocapacitive behavior. Moreover，at a current density of 2 A·g-1，the ZnSe@rGO nanocomposite still maintains 74.49% of its initial capacitance and nearly 100% Coulombic efficiency after 5000 cycles，demonstrating excellent cycling stability. When assembled into an asymmetric supercapacitor （ZnSe@rGO∥AC），the device achieves a specific capacitance of 112.5 F·g-1 at a current density of 1.0 A·g-1. It also delivers an energy density of 40.0 Wh·kg-1 at a power density of 2057.1 W·kg-1，making ZnSe@rGO a promising candidate material for asymmetric supercapacitors.
83
41
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
