添加剂对钒液流电池正极液的影响

摘要

研究了添加剂酒石酸、乙二酸、柠檬酸、葡萄糖对钒电池正极液电化学性能和稳定性的影响,并对其规律和机理进行了探讨。CV研究结果表明:含有多个—OH的有机物葡萄糖能明显提高正极液的阳极峰电流,含有多个—COOH的乙二酸能明显提高正极液的阴极峰电流,而含有多个—OH和多个—COOH的酒石酸对正极液的阴、阳极峰电流均有明显提高。同时,酒石酸(含氧官能团—OH和—COOH)能与5价钒作用,阻碍钒离子聚合,从而提高了5价钒的稳定性。交流阻抗测试表明,正极液中添加酒石酸能大大降低电荷传递电阻和溶液电阻,电解液的性能得到了显著提高。

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	钱程
	王为

关键词：钒电池添加剂电化学活性稳定性

Abstract：

Tartaric acid, oxalic acid, citric acid, and glucose are explored as additives in anolyte for vanadium redox battery(VRB), respectively. The effects of additives on anolyte are studied by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and stability test. The CV results indicate that glucose, which is one of the poly-hydroxy organic compounds, can improve oxidation peak current; oxalic acid containing multiple-carboxyl can improve reduction peak current; tartaric acid, which contain both poly-hydroxy and multiple-carboxyl, can both improve oxidation peak current and reduction peak current. Meanwhile tartaric acid can enhance the stability of V⁵⁺, which may due to the interaction between tartaric acid and vanadium ion. The EIS results indicate that the electrochemical activity of anolyte is improved by adding tartaric acid, which can reduce charge transfer resistance and solution resistance.

Keywords： vanadium battery； additive； electrochemical activity； stability

Received 2014-04-20;

Corresponding Authors: 王为,E-mail:wwangg@tju.edu.cn。 Email: wwangg@tju.edu.cn

About author: 钱程(1990-),男,硕士,主要研究方向为钒液流电池电解液。

引用本文:

钱程, 王为.添加剂对钒液流电池正极液的影响[J]. 化学工业与工程, 2016,33(2): 65-69

Qian Cheng, Wang Wei.Effect of Addictives on Anolyte for Vanadium Flow Battery[J]. Chemcial Industry and Engineering, 2016,33(2): 65-69

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