On-Demand Synthesis of H2 O2 by Water Oxidation for Sustainable Resource Production and Organic Pollutant Degradation.

Abstract

H2 O2 is a versatile and environmentally friendly chemical involved in water treatment, such as advanced oxidation processes. Anthraquinone oxidation is widely used for large-scale production of H2 O2 , which requires significant energy input and periodic replacement of the carrier molecule. H2 O2 production should be customized considering the specific usage scenario. Electrochemical synthesis of H2 O2 can be adopted as alternatives to traditional method, which avoids concentration, transportation, and storage processes. Herein, we identified Bi2 WO6 :Mo as a low-cost and high-selectivity choice from a series of Bi-based oxides for H2 O2 generation via two-electron water oxidation reaction. It can continuously provide H2 O2 for in situ degradation of persistent pollutants in aqueous solution. Clean energy from H2 can also be produced at the cathode. This kind of water splitting producing sustainable resources of H2 O2 and H2 is an advance in environmental treatment and energy science.