储能科学与技术 ›› 2017, Vol. 6 ›› Issue (2): 263-269.doi: 10.12028/j.issn.2095-4239.2016.0074

• 研究开发 • 上一篇    下一篇

氧化石墨烯修饰碳毡作为钒电池正极材料的电化学性能

井明华，范新庄，刘建国，严川伟   

  1. 中国科学院金属研究所，辽宁 沈阳 110016
  • 收稿日期:2016-09-23 修回日期:2016-09-30 出版日期:2017-03-01 发布日期:2017-03-01
  • 通讯作者: 范新庄，博士，主要研究方向为电极材料与储能电池，E-mail：xzfan@imr.ac.cn。
  • 作者简介:井明华（1988—），女，博士研究生，主要研究方向为电化学与储能电池，E-mail：mhjing14b@imr.ac.cn；
  • 基金资助:
    沈阳市科技计划项目（F16-205-1-19）

Electrochemical behavior of graphene oxide modified carbon felt as the positive electrode for vanadium flow battery#br#

JING Minghua, FAN Xinzhuang, LIU Jianguo, YAN Chuanwei   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China
  • Received:2016-09-23 Revised:2016-09-30 Online:2017-03-01 Published:2017-03-01

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被引次数

1

摘要： 作为液流电池的关键电极材料，碳毡是钒离子电极反应发生的场所，但其有限的电催化活性及反应面积严重制约了钒电池性能的提高。考虑到氧化石墨烯具有丰富的含氧官能团和良好的亲水性，可以通过简单的物理吸附法将氧化石墨烯修饰于碳毡表面，并将其作为钒电池正极材料，考察它对正极反应活性及电池性能的影响。实验结果表明，氧化石墨烯的修饰能够明显改善碳毡电极的亲水性，进而使其电化学表面积得到很大提高。值得关注的是，电化学测试结果说明，尽管氧化石墨烯/碳毡复合电极对 /VO2+ 的反应活性大幅增加，但其主要得益于电极有效反应面积的提高，而电催化活性的贡献则相当有限。此外，单电池测试结果表明，充放电电流密度越大，电池效率提高的越明显，这也说明了氧化石墨烯/碳毡复合电极具有良好的倍率性能。

关键词: 氧化石墨烯, 碳毡, 电催化活性, 电化学表面积, 钒电池, 正极反应

Abstract: As a frequently-used electrode material of the vanadium redox flow battery (VRFB), carbon felt (CF) supplies the redox reaction with places which is of great importance in determining the battery performance. However, due to the poor electrochemical activity for vanadium redox couples and the limited efficient reactive area, the performance of VRFB is limited greatly. Graphene oxide (GO) nanosheets with high specific surface area and abundant oxygen functional groups have been used to modify carbon felt (CF) by a simple physical adsorption method in this paper. And the electrochemical performance of the prepared GO/CF as the positive electrode in a VRFB has been investigated. The results show that after introducing GO nanosheets, the corresponding electrochemical surface area (ECSA) along with the wettability are greatly improved. Morever, according to the cyclic voltammograms (CV) and electrochemical impedance spectra (EIS) results, the improvement of the electrochemical response is mainly caused by the enlargement of the ECSA, however, the electrocatalytic activity of the GO/CF electrode has changed little. In addition, the charge/discharge results demonstrate that VRFB with GO/CF as its positive electrode shows higher battery efficiencies and favorable multiplying power performance.

Key words: graphene oxide, carbon felt, electrocatalytic activity, electrochemical surface area, vanadium flow battery, positive reaction