Metal Oxide-Based Electrocatalytic Materials for Hydrogen Evolution and Hydrogen Oxidation Reaction

The widespread environmental damage caused by the combustion of fossil fuels has posed significant global challenges. To achieve better electrocatalytic behavior with less expansion, oxygen evolution reaction (OER), oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) are very essential for the extensive commercialization of cells, water electrolyzers, and metal–air batteries. Hydrogen production from electrochemical water splitting is a highly promising technology for sustainable energy storage. On the other hand, metal oxides with enormous compositions and structures paved the way for HER electrocatalysis. In this chapter, we have summarized recent advances in the design and development of different metal oxides for hydrogen evolution and oxidation reactions. A brief description of some key fundamental concepts of HER and HOR has been discussed. This discussion is followed by a review of various metal oxides, such as nickel oxide, iron oxide, iridium oxide, and copper oxide, used for HER electrocatalysts. Lastly, some concluding remarks and perspectives on the future scope of this existing field are provided.