Volumetric capacitance of compressed activated microwave-expanded graphite oxide (a-MEGO) electrodes

被引：217

作者：

Murali, Shanthi ^{[1
,2
]}

Quarles, Neil ^{[1
,2
]}

Zhang, Li Li ^{[1
,2
]}

Potts, Jeffrey R. ^{[1
,2
]}

Tan, Ziqi ^{[3
,4
]}

Lu, Yalin ^{[3
,4
]}

Zhu, Yanwu ^{[3
,4
]}

Ruoff, Rodney S. ^{[1
,2
]}

机构：

[1] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA

[2] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[3] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China

[4] Univ Sci & Technol China, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China

来源：

NANO ENERGY | 2013年 / 2卷 / 05期

关键词：

Graphene; Pore size; Supercapacitors; Volumetric capacitance; Organic electrolyte; Compression; a-MEGO; DOUBLE-LAYER CAPACITORS; IMPEDANCE SPECTROSCOPY; SUPERCAPACITORS; ULTRACAPACITORS; PERFORMANCE; NANOTUBES; GRAPHENE;

D O I：

10.1016/j.nanoen.2013.01.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Volumetric capacitance is an important parameter for device applications. By simply compressing activated microwave-expanded graphite oxide (a-MEGO)-based electrode material, a volumetric capacitance of up to 110 F/cm(3) (3.5V maximum voltage) was achieved, when measured in a two-electrode cell supercapacitor configuration in an organic electrolyte. Nitrogen adsorption showed that the mesopores of a-MEGO (similar to 4 nm) collapsed due to the compression, and more micropores (1-2 nm) contributed to the energy storage in the compressed electrodes compared to uncompressed electrodes. This change in pore structure resulted in a higher effective series resistance and thus reduced power density in the compressed samples. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：764 / 768

页数：5

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