A Comprehensive Investigation of Sr Segregation Effects on the High-temperature Oxygen Evolution Reaction Rate

IF 32.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Energy & Environmental Science Pub Date : 2025-01-22 DOI:10.1039/d4ee05056h

Weicheng Feng, Geng Zou, Tianfu Liu, Rongtan Li, Jingcheng Yu, Yige Guo, Qingxue Liu, Xiaomin Zhang, Junhu Wang, Na Ta, Mingrun Li, Peng Zhang, Xing-Zhong Cao, Runsheng Yu, Yuefeng Song, Meilin Liu, Guoxiong Wang, Xinhe Bao

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Abstract

While the effects of Sr segregation on the performance and stability of perovskite electrodes in solid oxide electrolysis cells (SOECs) have been widely studied, most attention has been focused on surface Sr segregates, with the impact of the resulting Sr deficiencies within the bulk phase of the electrodes largely ignored. Here, we report our findings from an investigation into the impact of Sr deficiency in SrCo0.7Fe0.3O3-δ (SCF) lattice and surface Sr segregates on the electrochemical behavior of well-controlled anode materials. Results demonstrate that Sr deficiencies in the perovskite lattice significantly enhance bulk oxygen ion transport, while surface Sr segregates surpress oxygen vacancy formation at interfaces, resulting in a reduced rate of oxygen exchange and lower surface electrical conductivity. Our study provides critical insights into the roles of bulk Sr deficiencies and surface Sr segregates, particularly their effects on oxygen vacancy formation, electrical conductivity, oxygen ion transport, and the overall rate of high-temperature oxygen evolution reactions.

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Sr偏析对高温析氧反应速率影响的综合研究

虽然锶偏析对固体氧化物电解电池（soec）中钙钛矿电极性能和稳定性的影响已经被广泛研究，但大多数注意力都集中在表面锶偏析上，而在电极体相中产生的锶缺乏的影响在很大程度上被忽视了。本文研究了SrCo0.7Fe0.3O3-δ (SCF)晶格中Sr缺乏和表面Sr偏析对控制良好的阳极材料电化学行为的影响。结果表明，钙钛矿晶格中的Sr缺陷显著增强了大块氧离子的输运，而表面Sr偏析抑制了界面上氧空位的形成，导致氧交换速率降低，表面电导率降低。我们的研究为整体Sr缺陷和表面Sr偏析的作用提供了重要的见解，特别是它们对氧空位形成、电导率、氧离子传输和高温析氧反应的总体速率的影响。

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来源期刊

Energy & Environmental Science 化学-工程：化工

CiteScore

50.50

自引率

2.20%

发文量

349

审稿时长

2.2 months

期刊介绍： Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).