Electrochemical And Photoelectrochemical Water Oxidation For Hydrogen Peroxide Production

Hydrogen peroxide (H2O2), as a green fuel and oxidant, has drawn increasing attention in the energy and environmental research. Compared with the traditional anthraquinone process, the electrochemical (EC) and photoelectrochemical (PEC) syntheses of H2O2 are cost-effective and environmentally friendly. In order to construct membraneless EC/PEC devices for the full H2O2 synthesis, anodic H2O2 production by water oxidation, which is less developed than cathodic H2O2 generation, is highly desirable. Here, we review recent developments for the EC/PEC H2O2 production by water oxidation, including fundamental aspects, benchmarking activity evaluation, material/catalyst selection, and strategies for increasing selectivity, efficiency, and accumulation. Furthermore, we discuss the challenges and outlook of water oxidation for H2O2 production, especially device-level development, accumulation and stability, and industrial applications. Our review is intended to stimulate studies further improving EC/PEC H2O2 production.