Recent progress in advanced design of iridium-based and ruthenium-based perovskite catalysts for acidic oxygen evolution reaction

Proton exchange membrane water electrolyzer (PEMWE) is of great importance for the production of green hydrogen. The large-scale implementation of PEMWE, however, is seriously impeded by the sluggish oxygen evolution reaction (OER) at the anode, which results in considerable overpotential and thus the decreased energy conversion efficiency. To overcome this problem, researchers have extensively explored efficient anode catalysts that possess high activity and prolonged stability. Up to now, Ir-based and Ru-based catalysts are considered to be the most efficient candidates. Especially perovskite-based catalysts have received intensive attention due to their distinctive structures and exceptional OER catalytic performance. To further promote their practical application, considerable research efforts are devoted to structural engineering toward enhanced activity and stability. In this paper, a review of the research progress on the advanced design of Ir- and Ru-based perovskite catalysts is presented, with a focus on phase engineering, doping/substitution, morphology control, and compositing with other materials for perovskite catalysts as well as some preparation methods commonly used. It also summarizes the challenges and opportunities concerning perovskite-based catalysts in current research, yielding further comprehension of the pertinent preparation and scrutiny of perovskite catalysts in the future.