期刊
JOURNAL OF CATALYSIS
卷 381, 期 -, 页码 520-529出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.11.032
关键词
Solid oxide electrochemical cells; Steam electrolysis; Perovskite electrodes; Exsolution; Near ambient pressure XPS; Hydrogen production; Deactivation
资金
- Fuel Cells and Hydrogen 2 Joint Undertaking under the project SElySOs [671481]
- European Union's Horizon 2020 research and innovation programme
- project CALIPSOplus under the EU Framework Programme for Research and Innovation HORIZON 2020 [730872]
- China Scholarship Council (CSC)
Perovskite materials are typically used as oxygen electrodes of solid oxide fuel and electrolysis cells (SOC). The high stability of the perovskite structure in oxidative environments makes it a good candidate as a cathode electrode for steam electrolysis SOC as well. In this work, we investigate SOC with La0.75Sr0.25Cr0.9Fe0.1O3 perovskite cathodes employing near ambient pressure X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies combined with online electrochemical measurements. Based on operando experimental evidences the surface state of the perovskite electrode is directly associated with the electrocatalytic performance of the cell. The results indicate that under steam electrolysis operating conditions the well-known Sr surface enrichment is accompanied by Cr segregation and formation of SrCrO4-like oxide. In contrast to the common perception of the role of surface chromites, we show here that its presence does not induce cell deactivation, but on the contrary, is beneficial for cell performance. (C) 2019 Elsevier Inc. All rights reserved.
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