Transition Metal-Doped Complex Metal Oxide as Highly Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline Media

As the global energy crisis grows, hydrogen is attracting attention as a sustainable and clean energy to replace fossil fuel. Electrochemical water splitting by renewable energy, such as sunlight and wind, is a pollution-free way to produce large amounts of hydrogen and oxygen. The development of non-noble electrocatalysts with low cost, excellent performance and durability for overall water splitting is very important. Complex transition metal oxide, such as nickel iron oxide, nickel cobalt oxide, and cobalt iron oxide, exhibits relatively good performance in the oxygen evolution reaction. Recently, many studies have been conducted on improving the performance of oxygen evolution reaction due to the fast and brisk transfer of electrons through doping.<br/>In this work, we investigated the effects of transition metal doping on electrocatalytic performance of nickel iron oxide prepared by hydrothermal method. The transition metal-doped nickel iron oxide electrocatalyst showed better performance and stability in the oxygen evolution reaction for overall water splitting due to efficient charge transfer.<br/><br/><b>Acknowledgement</b><br/>This work was supported by the National Research Foundation of Korean (NRF) grant funded by the Korea government (Ministry of Science and ICT) (2021R1F1A1058854) and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE, 20217510100020, Development of platform process using common core and materialization technology for rare metal recovery from industrial low-grade waste liquid).