Detrimental role of hydrogen evolution and its temperature-dependent impact on the performance of vanadium redox flow batteries |
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Authors: | Abdulmonem Fetyan Gumaa A. El-Nagar Iver Lauermann Maike Schnucklake Jonathan Schneider Christina Roth |
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Affiliation: | Institute for Chemistry and Biochemistry;Chemistry Department;Helmholtz-Zentrum Berlin fur Materialien und Energie |
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Abstract: | 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. |
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Keywords: | Hydrogen evolution Carbon felt Degradation Electrode Redox flow batteries |
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