瑞士保罗谢勒研究所Emiliana Fabbri团队报道了PrBaCo2O5+δ模型电极的氧空位与析氧反应活性的关系。 相关研究成果发表在2021年4月7日出版的国际学术期刊《德国应用化学》。

该文系统研究了钙钛矿晶格氧在PrBaCo2O5+δ族中析氧反应(OER)中的作用。减少物理/化学变量数量结合，如中子衍射、O K边X射线吸收光谱（XAS）、电子能量损失光谱（EELS）、磁化和扫描透射电子显微镜（STEM）等与深入的表征研究，有助于研究OER活性与单个钙钛矿性质（例如氧含量）之间的复杂相关性。

大量的氧空位有利于OER，这可能与晶格氧的氧化机制有关，即晶格析氧反应（LOER）。此外，不仅空位的数量，而且空位在钙钛矿晶格中的局部排列也会影响OER活性，对于更稳定、有序的化学计量比而言明显下降。

附：英文原文

Title: Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo2O5+δ

Author: Emiliana Fabbri, Elena Marelli, Jaume Gazquez, Emiliya Poghosyan, Elisabeth Mü, Dariusz J. Gawryluk, Ekaterina Pomjakushina, Denis Sheptyakov, Cinthia Piamonteze, Dino Aegerter aegerter, Thomas J. Schmidt, Marisa Medarde

Issue&Volume: 2021-04-07

Abstract: The role of the perovskite lattice oxygen in the oxygen evolution reaction (OER) is systematically studied in the PrBaCo2O5+δ family. The reduced number of physical/chemical variables combined with in‐depth characterizations such as neutron dif‐fraction, O K‐edge X‐ray absorption spectroscopy (XAS), electron energy loss spectroscopy (EELS), magnetization and scanning transmission electron microscopy (STEM) studies, helps investigating the complex correlation between OER activity and a single perovskite property, such as the oxygen content. Larger amount of oxygen vacancies appears to facilitate the OER, possibly contributing to the mechanism involving the oxidation of lattice oxygen, i.e., the lattice oxygen evolution reaction (LOER). Furthermore, not only the number of vacancies but also their local arrangement in the perovskite lattice influences the OER activity, with a clear drop for the more stable, ordered stoichiometry.

DOI: 10.1002/anie.202103151

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202103151