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

Hydrogen peroxide (H 2 O 2 ) is a high-demand chemical, valued as a powerful and eco-friendly oxidant for various industrial applications. The traditional industrial method for producing H 2 O 2 , known as the anthraquinone process, is both costly and environmentally problematic. Electrochemical synthesis, which produces H 2 O 2 using electricity, offers a sustainable alternative, particularly suited for small-scale, continuous on-site H 2 O 2 generation due to the portability of electrocatalytic devices. For efficient H 2 O 2 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 H 2 O 2 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 H 2 O 2 production.