期刊
NATURE MATERIALS
卷 16, 期 9, 页码 925-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4938
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资金
- Swiss National Science Foundation through its Ambizione Program [PZ00P2_148041, PZ00P2_171426]
- Swiss Competence Center for Energy Research (SCCER) Heat & Electricity Storage
- Swiss National Science Foundation within NCCR Marvel
- Paul Scherrer Institute
- Swiss National Science Foundation (SNF) [PZ00P2_171426, PZ00P2_148041] Funding Source: Swiss National Science Foundation (SNF)
The growing need to store increasing amounts of renewable energy has recently triggered substantial R&D efforts towards effcient and stable water electrolysis technologies. The oxygen evolution reaction (OER) occurring at the electrolyser anode is central to the development of a clean, reliable and emission-free hydrogen economy. The development of robust and highly active anode materials for OER is therefore a great challenge and has been the main focus of research. Among potential candidates, perovskites have emerged as promising OER electrocatalysts. In this study, by combining a scalable cutting-edge synthesis method with time-resolved X-ray absorption spectroscopy measurements, we were able to capture the dynamic local electronic and geometric structure during realistic operando conditions for highly active OER perovskite nanocatalysts. Ba0.5Sr0.5Co0.8Fe0.2O3-delta as nano-powder displays unique features that allow a dynamic self-reconstruction of the material's surface during OER, that is, the growth of a self-assembled metal oxy(hydroxide) active layer. Therefore, besides showing outstanding performance at both the laboratory and industrial scale, we provide a fundamental understanding of the operando OER mechanism for highly active perovskite catalysts. This understanding significantly differs from design principles based on ex situ characterization techniques.
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