Investigation of Ir-modified carbon felt as the positive electrode of an all-vanadium redox flow battery
Investigation of Ir-modified carbon felt as the positive electrode of an all-vanadium redox flow battery
复制标题
Ir改性碳毡作为全钒氧化还原液流电池正极的研究
DOI：
10.1016/j.electacta.2007.04.121
复制
发表时间：
2007-08-01
影响因子：
6.6
通讯作者：
Wang, X. D.
中科院分区：
文献类型：
--
作者：
Wang, W. H.;Wang, X. D.
多孔石墨毡由于其宽的工作电位范围、作为阳极和阴极的稳定性以及高表面积的可用性而被用作全钒氧化还原液流电池的电极材料。本文采用H2 IrCl 6还原Ir热解的方法对炭毡进行改性。交流阻抗和稳态极化测量表明，Ir改性的材料具有改善的活性和降低的所需V（IV）/V（V）氧化还原过程的过电位。碳毡的红外改性提高了电极材料的导电性。Ir-材料，当涂覆在石墨毡电极表面上时，降低了电池内阻。将Ir改性的碳毡作为正极的活化层，未改性的原毡作为负极的活化层组装成测试电池。在工作电流密度为20 mA·cm ~（-2）时，电压效率为87.5%。与使用未改性毡的电池相比，使用Ir改性毡的电池的电阻降低了25%。(c)2007爱思唯尔有限公司版权所有。
Porous graphite felts have been used as electrode materials for all-vanadium redox flow batteries due to their wide operating potential range, stability as both an anode and a cathode, and availability in high surface area. In this paper, the carbon felt was modified by pyrolysis of Ir reduced from H2IrCl6. ac impedance and steady-state polarization measurements showed that the Ir-modified materials have improved activity and lowered overpotential of the desired V(IV)/V(V) redox process. Ir-modification of carbon felt enhanced the electro-conductivity of electrode materials. The Ir-material, when coated on the graphite felt electrode surface, lowered the cell internal resistance. A test cell was assembled with the Ir-modified carbon felt as the activation layer of the positive electrode, the unmodified raw felt as the activation layer of the negative electrode. At an operating current density of 20 mA cm(-2), a voltage efficiency of 87.5% was achieved. The resistance of the cell using Ir-modified felt decreased 25% compared to the cell using non-modified felt. (c) 2007 Elsevier Ltd. All rights reserved.