Structural engineering of rare-earth-based perovskite electrocatalysts for advanced oxygen evolution reaction

Oxygen evolution reaction (OER) acts an important role in electrochemical water splitting which converts sustainable and renewable energy into hydrogen fuel and the proper electrocatalysts are significant to the high-efficiency electrochemical water splitting. Rare-earth-based perovskites are promising catalysts for OER because of the low cost, the abundance of earth reserves, and coordinated electronic structures. However, their intrinsic OER property is still far from satisfactory from the viewpoint of industrial application, especially the electrocatalytic capability as well as stability under alkaline conditions. Herein, the recent advance in structural engineering of rare-earth-based perovskites for OER is reviewed comprehensively. The electrochemical characteristics enhancement strategy of rare-earth-based perovskites is discussed and organized according to structural engineering including A-site, B-site substitution, composite engineering, and morphology engineering. At last, the challenges and opportunities confronting rare-earth-based perovskites catalysts in superior OER are discussed.