期刊
ELECTROCHIMICA ACTA
卷 282, 期 -, 页码 813-821出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.06.131
关键词
Graphene functionalized carbon xerogel; Hydrothermal carbonization; Supercapacitor; High stability
资金
- National Key Research and Development Program of China [2017YFD0600804]
Biomass carbons have attracted considerable attention in the pursuit of cheap and renewable electrode materials. However, a low-energy route (like hydrothermal carbonization) is still a challenge for achieving bio-carbon electrodes with high-performance. Herein, a high-rate and high stability super-capacitor was fabricated based on graphene functionalized bio-carbon xerogel. The supercapacitor shows comparable or even higher performance than reported supercapacitors derived from bio-carbons and graphene-based materials, which can be attributed to sandwich-like porous structure that carbon spheres interspersed between porous graphene nanoplatelets. It demonstrates a superior specific capacitance of 139 F g(-1) at a superhigh current of 100 A g(-1) in an aqueous electrolyte, maintaining 73.5% of that at 1 A g(-1) (189 F g(-1)). More importantly, the device retains 100% of initial specific capacitance, energy density and power density after 10000 cycles at 5 A g(-1). This work paves the way to develop renewable supercapacitors based on low-cost biomass resources and low-energy fabrication. (C) 2018 Elsevier Ltd. All rights reserved.
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