超级电容器
石墨烯
电容
自愈水凝胶
材料科学
氧化物
功率密度
电流密度
化学工程
纳米技术
电极
功率(物理)
化学
高分子化学
冶金
物理化学
物理
量子力学
工程类
摘要
Graphene hydrogels prepared via hydrothermal reduction of graphene oxide dispersions (GH-Hs) were further reduced with hydrazine (Hz) or hydroiodic acid (HI) to improve their conductivities. The chemically reduced graphene hydrogels possess high conductivities of 1.3–3.2 S m–1, which are 1 order of magnitude higher than that of a GH-H (0.3 S m–1). The supercapacitor based on the Hz-reduced GH-H exhibited a high specific capacitance of 220 F g–1 at 1 A g–1, and this capacitance can be maintained for 74% as the discharging current density was increased up to 100 A g–1. Furthermore, it showed high power density and long cycle life. The high-performances of this supercapacitor make it promising for high rate charge/discharge applications.
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