Electrocatalysts for Hydrogen Production - Catalyst Design Strategies Based on Crystal Structures of Multimetal...

Solid-state crystalline multimetal oxides have been widely studied for their applications as electrode materials, e. g., in fuel cells, water electrolyzer, lithium-ion batteries, and metal-air batteries. Particularly, hydrogen production via water electrolysis is considered a key technology for realizing a sustainable circular carbon society. Enhancing the activity of electrocatalysts is a critical challenge for improving the efficiency of the water electrolysis technology. Thus, strategies for designing prominent catalyst materials have drawn considerable attention. Our group has been conducting research aimed at establishing comprehensive design strategies for the rational and rapid development of highly active catalysts. In this Personal Account, we present our research efforts on enhancing the activity of cost-efficient nonprecious metal-based oxide catalysts for the oxygen evolution reaction at the anode of water electrolysis. Specifically, we propose design strategies based on crystal structures of multimetal oxides and demonstrate how these strategies have contributed to the development of highly active electrocatalysts.