Graphene oxide nanoplatelets as excellent electrochemical active materials for VO2+/VO2+ and V2+/V3+ redox couples for a vanadium redox flow battery

被引：238

作者：

Han, Pengxian ^{[1
]}

Wang, Haibo ^{[1
]}

Liu, Zhihong ^{[1
]}

Chen, Xiao ^{[1
]}

Ma, Wen ^{[1
]}

Yao, Jianhua ^{[1
]}

Zhu, Yuwei ^{[1
]}

Cui, Guanglei ^{[1
]}

机构：

[1] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Peoples R China

来源：

CARBON | 2011年 / 49卷 / 02期

基金：

中国国家自然科学基金;

关键词：

GRAPHITE ELECTRODE MATERIALS; CHEMICAL-MODIFICATION; REDUCTION; STORAGE; CARBON; FILMS; NANOSHEETS; CELL;

D O I：

10.1016/j.carbon.2010.10.022

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：

Graphene oxide nanoplatelets (GONPs) are presented as electrochemical active materials for VO2+/VO2+ and V2+/V3+ redox couples for a vanadium redox flow battery. The structures and electrochemical properties of GONPs treated at different temperatures were investigated by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and cyclic voltammetry. The results indicate that GONPs treated at 50 degrees C (GONP-50) possess highly hydroxylated and carboxylated groups and exhibit an excellent electrocatalytic activity towards VO2+/VO2+ and V2+/V3+ redox couples, while the pristine graphite only shows a reversible electrocatalytic activity towards VO2+/VO2+, suggesting that the V2+/V3+ redox reaction more strongly depends on the oxygen-containing groups attached on graphite surface than does the VO2+/VO2+. With the increase of treatment temperature, the polarization is reduced significantly. GONPs treated at 120 degrees C (GNOP-120) exhibit a lower electrochemical polarization than that of GONP-50 because of relatively higher electrical conductivity despite moderate electrocatalytic activity. The diffusion of VO2+ is faster on the surface of GONP-50 than on the pristine graphite and GNOP-120. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：693 / 700

页数：8

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