Progress of Metal Chalcogenides as Catalysts for Efficient Electrosynthesis of Hydrogen Peroxide.

Hydrogen peroxide (HO) is a high-demand chemical, valued as a powerful and eco-friendly oxidant for various industrial applications. The traditional industrial method for producing HO, known as the anthraquinone process, is both costly and environmentally problematic. Electrochemical synthesis, which produces HO using electricity, offers a sustainable alternative, particularly suited for small-scale, continuous on-site HO generation due to the portability of electrocatalytic devices. For efficient HO electrosynthesis, electrocatalysts must exhibit high selectivity, activity, and stability for the two-electron pathway-oxygen reduction reaction (2e ORR). Transition-metal chalcogenide (TMC)-based materials have emerged as promising candidates for effective 2e ORR due to their high activity in acidic environments and the abundance of their constituent elements. This review examines the potential of TMC-based catalysts in HO electrosynthesis, categorizing them into noble-metal and non-noble-metal chalcogenides. It underscores the importance of achieving high selectivity, activity, and stability in 2e ORR. By reviewing recent advancements and identifying key challenges, this review provides valuable insights into the development of TMC-based electrocatalysts for sustainable HO production.