Formation of hierarchical 3D cross-linked porous carbon with small addition of graphene for supercapacitors

Qian Li, Dongren Chen, Rui Hu, Jiqiu Qi, Yanwei Sui, Yezeng He, Qingkun Meng, Fuxiang Wei, Yaojian Ren, Yulong Zhao, Wenqing Wei

科研成果: 期刊稿件文章同行评审

23 引用 (Scopus)

摘要

In the present paper, starch was used as raw material to prepare carbon material with low-temperature hydrothermal route and hierarchical three-dimensional cross-linked porous carbon was successfully synthesized with the help of a small amount of graphene for high-performance supercapacitors. It's found that presence of graphene is a crucial condition for the formation of 3D porous carbon and graphene acts as a skeleton in the porous carbon. This kind of carbon material exhibited very high surface area of 1887.8 m2 g−1 and delivered excellent electrochemical performance. Its specific capacitance can reach 141 F g−1 at 0.5 A g−1 and more importantly, after 10,000 cycles 98.6% of initial specific capacitance can be maintained. To explore the practical application of the 3D porous carbon, an asymmetric supercapacitor coin-type device was assembled with 3D porous carbon and graphene as electrode materials in organic electrolyte. The constructed device exhibited high energy density of 48.5 Wh·kg−1 at a power density of 1.5 kW kg−1 and still maintains 39.625 Wh·kg−1 under the high power density (15 kW kg−1). These results will promote the rapid development of 3D porous carbon prepared by low-temperature route and the application in supercapacitors.

源语言英语
页(从-至)27471-27481
页数11
期刊International Journal of Hydrogen Energy
45
51
DOI
出版状态已出版 - 16 10月 2020

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