摘要
【目的】目前,石墨毡电极因其低廉的成本和优良的催化性能被广泛应用于全钒液流电池中,但较差的亲水性和较低的化学稳定性限制了其发展。为了提高石墨毡电极的性能,使用引入催化剂的方法对石墨毡电极进行改性。【方法】使用Cr_(3)C_(2)作为全钒液流电池VO^(2+)/VO_(2)^(+)氧化还原电对的正极催化剂;通过X射线衍射仪、扫描电子显微镜和能量色散X射线谱对Cr_(3)C_(2)进行表征;并对改性后的电极进行电化学测试和充放电测试。【结果】Cr_(3)C_(2)的加入能够有效提高电极的电化学活性。在电化学测试中,Cr_(3)C_(2)在VO^(2+)/VO_(2)^(+)氧化还原过程中表现出良好的电化学活性和可逆性。在充放电测试中,改性电池在50次充放电循环后的放电容量为92.1 mA·h,比空白电池的大了17.1 mA·h。改性电池循环后的电压效率达到了86.14%,大于空白电池的80.84%。【结论】Cr_(3)C_(2)是一种能提高全钒液流电池电化学性能的、有前途的正极催化剂。
[Purposes]At present,graphite felt electrodes are widely used in all-vanadium flow batteries due to their low cost and excellent catalytic performance,but poor hydrophilicity and low chemical stability limit their development.In order to improve the performance of graphite felt electrodes,the method of introducing catalysts was used to modify the graphite felt electrodes.[Methods]Cr_(3)C_(2) was used as the cathode catalyst for the VO^(2+)/VO_(2)^(+) redox couple in the all-vanadium redox flow battery.Cr_(3)C_(2) was characterized by X-ray diffractometer,scanning electron microscopy and X-ray energy dispersive spectrum.Electrochemical tests and charge-discharge tests were carried out on the modified e lectrodes.[Findings]The morphology of Cr_(3)C_(2) can effectively improve the electrochemical activity of the electrodes.In electrochemical tests,Cr_(3)C_(2) exhibited good electrochemical activity and reversibility in the VO^(2+)/VO_(2)^(+) redox process.In the charge-discharge test,the modified battery had a discharge capacity of 92.1 mA·h after 50 charge-discharge cycles,which was 17.1 mA·h higher than that of the blank battery.The voltage efficiency of the modified battery after cycling reached 86.14%,which was higher than that of the blank battery(80.84%).[Conclusions]Cr_(3)C_(2) is a promising cathode catalyst for improving the electrochemical performance of vanadium redox flow batteries.
作者
朱文杰
李瑾
杨玉杰
高嘉怡
赵增坡
何章兴
ZHU Wenjie;LI Jin;YANG Yujie;GAO Jiayi;ZHAO Zengpo;HE Zhangxing(College of Chemical Engineering,North China University of Science and Technology,Tangshan 063210,China;Hebei Cellulose Fiber Technology Innovation Center,Tangshan 063305,China)
出处
《长沙理工大学学报（自然科学版）》
CAS
2022年第3期20-30,共11页
Journal of Changsha University of Science and Technology:Natural Science
基金
河北省杰出青年基金资助项目(E2019209433)
河北省教育厅青年拔尖人才项目(BJ2018020)。
关键词
化学电源
全钒液流电池
碳化铬
石墨毡
电极改性
chemical power source
all-vanadium redox flow battery
chromium carbide
graphite felt
electrode modification
