全钒液流电池用碳纳米管-石墨复合电极的研究

doi:10.3724/SP.J.1077.2010.00659

无机材料学报 ›› 2010, Vol. 25 ›› Issue (6): 659-663.DOI: 10.3724/SP.J.1077.2010.00659

全钒液流电池用碳纳米管-石墨复合电极的研究

黄可龙¹, 陈若媛¹, 刘素琴¹, 史小虎², 张庆华²

(1. 中南大学化学化工学院, 长沙410083; 2. 湖南维邦新能源有限公司中大 · 维邦研究院, 长沙 410013)

收稿日期:2009-10-29 修回日期:2009-12-01 出版日期:2010-06-20 网络出版日期:2010-05-12
基金资助:
国家自然科学基金(50772133)

Characteristics of Carbon Nanotube-graphite Composite Electrodes for Vanadium Redox Flow Battery

HUANG Ke-Long¹, CHEN Ruo-Yuan ¹, LIU Su-Qin¹, SHI Xiao-Hu², ZHANG Qing-Hua²

(1. College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, China; 2.Hunan V-Power new energy Co. Ltd, Central South University V-power Institute, Changsha 410013, China)

Received:2009-10-29 Revised:2009-12-01 Published:2010-06-20 Online:2010-05-12

摘要/Abstract

摘要： 将石墨(GP)和多壁碳纳米管(MWNT)按不同比例压片制成电极, 用于全钒氧化还原液流电池电极材料, 通过循环伏安、交流阻抗、充放电测试、SEM手段对MWNT-GP复合电极进行表征和分析. 研究结果表明, MWNT含量为15wt%的MWNT-GP复合电极性能最佳, 对组装成的静态电池在电流密度20~80 mA/cm²进行充放电性能比较, 电流效率均在93%以上, 电压效率随着电流密度的增加而有所下降.

关键词: 全钒液流电池, 碳纳米管, 复合电极

Abstract: Electrodes were prepared by mixture of graphite powder (GP) and multi-walled carbon nanotubes (MWNT) at various ratios for all-vanadium redox flow battery. In this studies, the surface morphologies of the composite electrodes were characterized by scanning electron microscope (SEM), and electrochemical behaviors were investigated by cyclic voltammograms, impedance spectroscope and charge-discharge technique. SEM observation shows that the electrode surface roughness increases after adding MWNT to GP. The research results indicate that the MWNT added into GP can provide good electron conductive network between the GP particles, which results in a shorter current conducting pathway in the sheet GP and also a lower internal resistance for the electrodes. The best composition for the positive electrode of all-vanadium redox flow battery (VRB) with different content of MWNT is 15wt%. The current efficiency of VRB using 15wt% MWNT-GP composite electrode is above 93% and the voltage efficiency decrease with current densities increasing under current densities of 20?80 mA/cm2. The improvement in the electrochemical activity of 15wt% MWNT-GP composite electrode is ascribed to the decrease in the total resistivity of vanadium ions adsorption and desorption from MWNT-GP composite electrode and the charge transfer resistivity of MWNT-GP electrode at the electrolyte/electrode interface.

Key words: all vanadium redox flow battery, carbon nanotube, composite electrode

中图分类号:

TM912

黄可龙1, 陈若媛1, 刘素琴1, 史小虎2, 张庆华2. 全钒液流电池用碳纳米管-石墨复合电极的研究[J]. 无机材料学报, 2010, 25(6): 659-663.

HUANG Ke-Long 1, CHEN Ruo-Yuan 1, LIU Su-Qin 1, SHI Xiao-Hu 2, ZHANG Qing-Hua 2. Characteristics of Carbon Nanotube-graphite Composite Electrodes for Vanadium Redox Flow Battery[J]. Journal of Inorganic Materials, 2010, 25(6): 659-663.

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全钒液流电池用碳纳米管-石墨复合电极的研究

Characteristics of Carbon Nanotube-graphite Composite Electrodes for Vanadium Redox Flow Battery

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