High energy supercapacitors based on interconnected porous carbon nanosheets with ionic liquid electrolyte
By Zhou, Dong; Wang, Huanlei; Mao, Nan; Chen, Yanran; Zhou, Ying; Yin, Taiping; Xie, Hui; Liu, Wei; Chen, Shougang; Wang, Xin
Published in Microporous and Mesoporous Materials
2017
Abstract
Abstract Future development of electrochemical energy storage systems requires low-cost supercapacitors with not only an outstanding power performance but also the high energy. Herein, interconnected porous carbon nanosheets are prepared via a simple hydrothermal process combined with chemical activation route by using reed as the precursor and {KOH} as the activating agent. The as-prepared carbon nanosheets exhibits a high specific surface area (up to 2183 m2 g?1), and a hierarchical porous structure containing combined macroporous scaffolds and meso/microporous textures. When tested as electrode materials for ionic liquid-based supercapacitors, the carbon nanosheet exhibits a high capacitance of 147 F g?1 and a good capacitance retention ratio of 48.3% at 100 A g?1, with a high cycling life stability (10% loss after 10000 cycles). Moreover, the assembled supercapacitor yields a maximum energy and power density of 11.4 Wh kg?1 and 98 kW kg?1 based on the all components of the packaged device. The remarkable characteristics of the produced carbon materials indicate that the novel precursor-synthesis route offers promising potential for low-cost production for supercapacitors.