Recent advances in quadruple perovskite oxides-based electrocatalysts for oxygen evolution reaction: A review

Abstract

Quadruple perovskite oxides (QPOs), AA´3B4O12 exhibit a 1:3 cationic order at the A site, with 25% of the A site occupied by conventional A-site cations with icosahedral coordination, and 75% of the A-site occupied by A´ ions with pseudosquare planar coordination. Traditional 3d transition metal ions occupy the B site with octahedral coordination. This complex crystal structure provides multiple metal sites (A, A´, and B), which act as active centers for oxygen evolution reaction (OER) in water electrolysis. Therefore, the intrinsic OER activity and stability of QPOs have been significantly improved. In recent years, extensive experimental and theoretical researches have been conducted on QPOs, and many QPOs have been synthesized under high pressure and high temperature conditions. These QPOs exhibit superior intrinsic OER activity and stability as compared to advanced perovskite oxide-based catalysts. This is attributed to the complex crystal structure of QPO and its electronic interaction with A, as well as the B site. Nowadays, QPO has become a promising candidate for OER electrocatalysts, which prompts us to review the latest developments in this thriving research field. However, there has been relatively little comprehensive review of this important topic so far. This article reviews the systematic research on the OER activity of QPO in recent years, in which multiple transition metal ions are located at different crystal sites. It is expected that this timely review will not only deepen our understanding of the OER mechanism in QPO, but also provide guidance for designing the next generation of OER electrocatalysts in the future.