3D MnO2-graphene composites with large areal capacitance for high-performance asymmetric supercapacitors

被引:247
|
作者
Zhai, Teng [1 ]
Wang, Fuxin [1 ]
Yu, Minghao [1 ]
Xie, Shilei [1 ]
Liang, Chaolun [1 ,2 ]
Li, Cheng [1 ]
Xiao, Fangming [3 ]
Tang, Renheng [3 ]
Wu, Qixiu [4 ]
Lu, Xihong [1 ]
Tong, Yexiang [1 ]
机构
[1] Sun Yat Sen Univ, KLGHEI Environm & Energy Chem, Sch Chem & Chem Engn, Key Lab Bioinorgan & Synthet Chem,MOE, Guangzhou 510275, Guangdong, Peoples R China
[2] Sun Yat Sen Univ, Instrumental Anal & Res Ctr, Guangzhou 510275, Guangdong, Peoples R China
[3] Guangzhou Res Inst Nonferrous Met, Guangzhou 510651, Guangdong, Peoples R China
[4] Zhanjiang Juxin New Energy Co Ltd, Guangzhou 524300, Guangdong, Peoples R China
基金
高等学校博士学科点专项科研基金;
关键词
CORE-SHELL NANOWIRES; GRAPHENE OXIDE; HIGH-ENERGY; FUNCTIONALIZED GRAPHENE; FACILE SYNTHESIS; GRAPHITE OXIDE; HIGH-POWER; ELECTRODES; ARRAYS; REDUCTION;
D O I
10.1039/c3nr01589k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this paper, we reported an effective and simple strategy to prepare large areal mass loading of MnO2 on porous graphene gel/Ni foam (denoted as MnO2/G-gel/NF) for supercapacitors (SCs). The MnO2/G-gel/NF (MnO2 mass: 13.6 mg cm(-2)) delivered a large areal capacitance of 3.18 F cm(-2) (234.2 F g(-1)) and good rate capability. The prominent electrochemical properties of MnO2/G-gel/NF are attributed to the enhanced conductivities and improved accessible area for ions in electrolytes. Moreover, an asymmetric supercapacitor (ASC) based on MnO2/G-gel/NF (MnO2 mass: 6.1 mg cm(-2)) as the positive electrode and G-gel/NF as the negative electrode achieved a remarkable energy density of 0.72 mW h cm(-3). Additionally, the fabricated ASC device also exhibited excellent cycling stability, with less than 1.5% decay after 10 000 cycles. The ability to effectively develop SC electrodes with high mass loading should open up new opportunities for SCs with high areal capacitance and high energy density.
引用
收藏
页码:6790 / 6796
页数:7
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