High power density of graphene-based supercapacitors in ionic liquid electrolytes

被引：27

作者：

Chen, Yao ^{[1
,2
]}

Zhang, Xiong ^{[1
]}

Zhang, Dacheng ^{[1
,2
]}

Ma, Yanwei ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Elect Engn, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 68卷

基金：

中国国家自然科学基金;

关键词：

Carbon materials; Energy storage and conversion;

D O I：

10.1016/j.matlet.2011.11.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reduced graphene oxide (RGO) has been prepared with HBr as a reducing reagent. RGO-based supercapacitors in two-electrode systems have been fabricated in ionic liquid electrolytes of 1-butyl-3-methylimidazolium hexafluorphosphate (BMIPF6) and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIBF4), respectively. RGO in BMIBF4 shows higher capacitance of 74 F g(-1) at 10 mV s(-1), while RGO in BMIPF6 merely exhibits 45 F g(-1). However, due to wider potential window of 4 V for BMIPF6. RGO in BMIPF6 has higher energy and power densities. The highest power density of 27.8 kW kg(-1) is obtained at 14 A g(-1) and the maximum energy density of 18.9 Wh kg(-1) at 1 A g(-1) for BMIPF6. The exciting results infer potential application for RGO in BMIPF6. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：475 / 477

页数：3

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