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Dynamic surface self-reconstruction is the key of highly active perovskite nano-electrocatalysts for water splitting
Nature Materials ( IF 37.2 ) Pub Date : 2017-07-17 00:00:00 , DOI: 10.1038/nmat4938
Emiliana Fabbri , Maarten Nachtegaal , Tobias Binninger , Xi Cheng , Bae-Jung Kim , Julien Durst , Francesco Bozza , Thomas Graule , Robin Schäublin , Luke Wiles , Morgan Pertoso , Nemanja Danilovic , Katherine E. Ayers , Thomas J. Schmidt

The growing need to store increasing amounts of renewable energy has recently triggered substantial R&D efforts towards efficient 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−δ as nano-powder displays unique features that allow a dynamic self-reconstruction of the materials 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.

中文翻译:

动态表面自我重建是高活性钙钛矿纳米电催化剂用于水分解的关键

存储越来越多的可再生能源的需求不断增长,最近引发了对高效,稳定的水电解技术的大量研发工作。在电解阳极处发生的析氧反应(OER)对于开发清洁,可靠且无排放的氢经济至关重要。因此,开发用于OER的坚固,高活性阳极材料是一个巨大的挑战,并且一直是研究的主要重点。在潜在的候选物中,钙钛矿已经成为有前途的OER电催化剂。在这项研究中,通过将可扩展的尖端合成方法与时间分辨的X射线吸收光谱法测量相结合,我们能够捕获现实操作过程中的动态局部电子和几何结构活性OER钙钛矿纳米催化剂的制备条件。的Ba 0.50.50.80.2 ø 3- δ作为纳米粉末显示独特的功能,其允许材料的动态自重建' OER在S表面,即,自组装金属氧的生长(氢氧化物)活动层。因此,除了在实验室和工业规模上均表现出出色的性能外,我们还提供了对高活性钙钛矿催化剂的操作性OER机理的基本了解。这种理解与基于异地表征技术的设计原理有很大不同。
更新日期:2017-08-29
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