Detrimental role of hydrogen evolution and its temperature-dependent impact on the performance of vanadium redox flow batteries  

作　　者：Abdulmonem Fetyan Gumaa A. El-Nagar Iver Lauermann Maike Schnucklake Jonathan Schneider Christina Roth 

机构地区：[1]Institute for Chemistry and Biochemistry,Freie Universitat Berlin,Takustr.3,D-14195 Berlin,Germany [2]Chemistry Department,Faculty of Science,Cairo University,Cairo 12613,Egypt [3]Helmholtz-Zentrum Berlin fur Materialien und Energie,Hahn-Meitner-Platz 1,14109 Berlin,Germany

出　　处：《Journal of Energy Chemistry》2019年第5期57-62,共6页能源化学（英文版）

基　　金：a fellowship from the Alexander von Humboldt Foundation (AvH)

摘　　要：This paper addresses the damaging role of the parasitic hydrogen evolution reaction (HER) in the negative half-cell of a vanadium redox flow battery (VRFB) on state-of-the-art carbon felt electrodes at different temperatures. It was found that increasing the temperature resulted in a better catalytic performance for both the positive and negative half-cell reactions. In addition, increasing the temperature significantly enhanced the undesired HER at the negative side. Operating the VRFB cell at higher temperature led to a decrease in the coulombic efficiency attributed to the higher hydrogen production. More pronounced hydrogen production caused an oxidation on the surface of the carb on fibers and a degradation of the electrode as indicated from scanning electron microscopy and X-ray photoelectron spectroscopy measurements. This observed degradation results in fading of the overall performance of the vanadium redox flow battery over time.This paper addresses the damaging role of the parasitic hydrogen evolution reaction(HER) in the negative half-cell of a vanadium redox flow battery(VRFB) on state-of-the-art carbon felt electrodes at different temperatures. It was found that increasing the temperature resulted in a better catalytic performance for both the positive and negative half-cell reactions. In addition, increasing the temperature significantly enhanced the undesired HER at the negative side. Operating the VRFB cell at higher temperature led to a decrease in the coulombic efficiency attributed to the higher hydrogen production. More pronounced hydrogen production caused an oxidation on the surface of the carbon fibers and a degradation of the electrode as indicated from scanning electron microscopy and X-ray photoelectron spectroscopy measurements. This observed degradation results in fading of the overall performance of the vanadium redox flow battery over time.

关 键 词：Hydrogen evolution Carbon FELT Degradation ELECTRODE Redox FLOW BATTERIES 

分 类 号：O4[理学—物理]