材料科学
超级电容器
石墨烯
电压
泄漏(经济)
自放电
氧化物
电极
电化学
光电子学
纳米技术
电气工程
功率(物理)
冶金
热力学
电池(电)
化学
工程类
宏观经济学
物理化学
经济
物理
作者
Rajneesh Kumar Mishra,Gyu Jin Choi,Youngku Sohn,Seung Hee Lee,Rajneesh Kumar Mishra
标识
DOI:10.1016/j.matlet.2019.06.073
摘要
Herein, we report the electrochemical properties such as self-discharge, leakage current and voltage holding tests (VHTs) of reduced graphene oxide (RGO) based solid-state symmetric supercapacitors (SSCs). SSC device demonstrates wide potential window (1.2 V), high specific capacity of 110.3 mA h g−1 at 1 A g−1, high energy density of 22.1 W h kg−1 and ultra-high power density of 7304.5 W kg−1. Further, SSC device depicts the high stability of 89.4% after 10,000 galvanostatic charge/discharge (GCD) cycles and 82.3% after 20 h VHTs. It also shows the small leakage current of 0.029 mA. Furthermore, SSC device retains the voltage of 0.7 V of its initial voltage (1.2 V) after 1 h self-discharge test, which suggests good state of health of the SSC device.
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