期刊
JOURNAL OF APPLIED ELECTROCHEMISTRY
卷 50, 期 4, 页码 463-473出版社
SPRINGER
DOI: 10.1007/s10800-020-01404-5
关键词
N,S co-doping; Graphene hydrogel; Hierarchical network; Supercapacitor
资金
- National Natural Science Foundation of China [11890674]
In this investigation, nitrogen and sulfur co-doped graphene hydrogel (N,S-GH) with well-connected hierarchical networks was prepared using a simple one-step process. The hierarchical structures provide electrically conductive channels for ion transfer, whereas N,S heteroatoms improve the chemical reactivity and pseudocapacitance of the electrode material. An optimized N,S-GH as a bind-free supercapacitor electrode demonstrates a large gravimetric capacitance (294.8 F g(-1) at 1 A g(-1)), long lifetime (89.4% retention after 10,000 cycles), and excellent rate capability, twice as that of pure GH due to the synergistic effect of N and S doping. Therefore, a large capacitance of the optimized N,S-GH is ascribed to fast ion diffusion, large accessible area (hierarchical network), and pseudocapacitance (N and S co-doping). Furthermore, the optimized N,S-GH-based supercapacitor delivers a high energy density (8.6 Wh kg(-1)) at a high power density (2.4 kW kg(-1)). Overall, the obtained N,S-GH through this investigation presents a promising electrode material with outstanding electrochemical properties for energy storage applications.
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