期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 41, 期 38, 页码 16627-16636出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.07.125
关键词
PEM water electrolysis; Ageing; Fluoride release; Membrane thinning
资金
- European 7th Framework Program [303484]
- CEA
Proton exchange membrane water electrolyzes (PEM WE) is an attractive electrochemical device that generates high purity hydrogen. However, its insufficient durability relatively to its high system cost is a bottleneck of that technology when compared to alkaline water electrolysis. In this work,. the influence of the ageing protocols on PEM WE performances is investigated. From electrochemical and physico-chemical analyses it was found that high temperature degrades the membrane more than the current density does. High F- content from the perfluorosulfonic acid (PFSA) membrane degradation was found on the cathode side. Such a result supports the 2 e- oxygen reduction reaction mechanism that generates hydrogen peroxide which is known as detrimental compound for the PFSA membranes. The monitoring of the fluoride rate might be a suitable parameter to estimate the membrane thickness change. In our test conditions at 80 degrees C the membrane thinning rate was found to be 25 nm/h using SEM images which was twice the value found from fluoride measurements. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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