期刊
ENERGY & FUELS
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.2c02723
关键词
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资金
- National Natural Science Foundation of China [22065005, 52062004, 51972070]
- Key Project of Natural Science Foundation of Guizhou Province [[2020] 1Z042]
- Cultivation Project of Guizhou University [GDPY [2019] 01]
- Science and Technology Support Project of Guizhou Province [QKHZC [2021] YB317]
- Introduction of Talent Research Fund of Guizhou University [202052]
A hierarchically porous graphene aerogel with abundant oxygenated groups and hand-tearing bread-like macromorphology has been successfully achieved using a sacrificial MnO2 template approach. The resulting aerogel exhibits improved wettability and pseudocapacitance, making it a promising candidate for supercapacitor applications.
A hierarchically porous graphene aerogel (HP-GA) with abundant oxygenated groups and hand-tearing bread-like macromorphology is achieved by a sacrificial MnO2 template approach. Oxygenated groups on graphene sheets improve the wettability of HP-GA to an aqueous electrolyte and contribute to pseudocapacitance. The chlorine (Cl2) gas as a result of the reaction of MnO2 and HCl is responsible for the formation of the hierarchically porous microstructure and hand-tearing bread-like macromorphology, ensuring a large electrolyte accessible surface area within the electrodes. When used as the active electrode material in supercapacitors, HP-GA exhibits a large specific capacitance of 284 F g-1 at 1 A g-1 and ultrahigh energy density of 10 Wh kg-1 at 250 W kg-1 in an aqueous electrolyte. This work provides a versitile, simple, and easy to control way to alter the microstructure and macromorphology of graphene-based areogels that have promising applications in many areas, including adsorption, energy storage, heat insulation, acoustical insulation, and intelligent sensing system.
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