Graphite-graphite oxide composite electrode for vanadium redox flow battery
Graphite-graphite oxide composite electrode for vanadium redox flow battery
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DOI：
10.1016/j.electacta.2011.02.083
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发表时间：
2011-05
影响因子：
6.6
通讯作者：
Wenyue Li;Jianguo Liu;Chuan-wei Yan
中科院分区：
文献类型：
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作者：
Wenyue Li;Jianguo Liu;Chuan-wei Yan
制备了一种用于钒电池的石墨/氧化石墨复合电极。用X射线衍射、X射线光电子能谱和扫描电子显微镜对材料进行了表征。通过Brunauer-Emmett-Teller方法测量比表面积。用循环伏安法和交流阻抗法研究了[VO 2]+/[VO]2+和V3+/V2+的氧化还原反应。结果表明，在石墨电极中加入3wt%的氧化石墨烯，电极的电化学性能得到明显改善。复合电极上[VO 2]+/[VO]2+和V3+/V2+电对的氧化还原峰电流比石墨电极上增加了近一倍，同时复合电极上氧化还原对的电荷转移电阻也降低了。其电化学活性的提高主要归因于氧化石墨烯的基面和片边上存在丰富的含氧官能团以及氧化石墨烯引入的大比表面积。
A graphite/graphite oxide (GO) composite electrode for vanadium redox battery (VRB) was prepared successfully in this paper. The materials were characterized with X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The specific surface area was measured by the Brunauer–Emmett–Teller method. The redox reactions of [VO2]+/[VO]2+and V3+/V2+were studied with cyclic voltammetry and electrochemical impedance spectroscopy. The results indicated that the electrochemical performances of the electrode were improved greatly when 3 wt% GO was added into graphite electrode. The redox peak currents of [VO2]+/[VO]2+and V3+/V2+couples on the composite electrode were increased nearly twice as large as that on the graphite electrode, and the charge transfer resistances of the redox pairs on the composite electrode are also reduced. The enhanced electrochemical activity could be ascribed to the presence of plentiful oxygen functional groups on the basal planes and sheet edges of the GO and large specific surface areas introduced by the GO.