Effect of l-glutamic acid on the positive electrolyte for all-vanadium redox flow battery
Effect of l-glutamic acid on the positive electrolyte for all-vanadium redox flow battery
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L-谷氨酸对全钒氧化还原液流电池正极电解液的影响
DOI：
10.1016/j.electacta.2013.01.138
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发表时间：
2013-04
影响因子：
6.6
通讯作者：
Xinxing Lianga, Sui Penga, Ying Lei a, Chao Gaoa,
中科院分区：
文献类型：
--
作者：
Xinxing Lianga, Sui Penga, Ying Lei a, Chao Gaoa,
将l-谷氨酸作为全钒氧化还原液电池（VRFB）正电解质的添加剂，研究了其对全钒氧化还原液电池热稳定性和电化学活性的影响。结果表明，l-谷氨酸的加入能显著缓解v2o5从正电解质中析出的现象。2M V(V)溶液在40℃下保存89h后，V(V)离子的守恒率高达58%。此外，l-谷氨酸还能改善阳极电解质的传质和电化学性能。库仑效率达95%以上，能源效率达74%。XPS谱图表明，l-谷氨酸可以与碳毡电极表面发生反应，引入更多的含氧和含氮基团，这可能是提高电极电化学性能的原因。
l-Glutamic acid is used as an additive for the positive electrolyte of all-vanadium redox flow battery (VRFB), and its effect on the thermal stability and electrochemical activity is investigated. It is found that the addition of l-glutamic can significantly alleviate the precipitation of V2O5from positive electrolyte. The conservation rate of V(V) ion can be as high as 58% after 2M V(V) solution being kept in 40°C for 89h. Besides, l-glutamic can also improve the mass transport and electrochemical performance of anolyte. A high coulombic efficiency of over 95% and energy efficiency of 74% are obtained. XPS spectra illustrate that l-glutamic can react with the surface of carbon felt electrode and introduce more oxygen-containing and nitrogen-containing groups, which should be responsible for the improvement of electrochemical performance.
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