Research Progress in Catalysts and Mechanism of Electrocatalytic Reduction of Oxygen to Hydrogen Peroxide
Hydrogen peroxide(H2O2)is an environmentally friendly chemical with strong oxidizing ability,which is widely used in the fields of disinfection and sterilization,environmental treatment,and chemical chemistry.Currently,the industrial production of H2O2 mainly relies on traditional processes,which are plagued by many challenges,such as the anthraquinone method with high ener-gy consumption and pollution,and the H2/O2 mixing method with high technological risks and easy to explode.Therefore,there is an urgent need for a green,convenient method to synthesize H2O2 under mild conditions and decentralized production.2e-Oxygen Re-duction Reaction(2e-ORR)is a renewable electric power-driven synthesis of H2O2 under mild conditions in a green and sustainable method.Strong competition for the four-electron pathway reduces the selectivity of H2O2,leading to low yields and Faraday efficien-cies.Therefore,the design and development of highly selective 2e-ORR catalysts for a dedicated H2O2 synthesis pathway for scale-up applications and upgraded industrial synthesis routes is an urgent issue.Although the 2e-ORR catalysts developed at this stage have made remarkable progress,there is still a big gap between them and the scale-up application.This paper reviews the recent research progress in electrocatalytic 2e-ORR generation of hydrogen peroxide.Firstly,it introduces the research on catalysts for electrocatalytic synthesis of hydrogen peroxide.Secondly,it analyzes and discusses the catalytic mechanism and its key factors affecting the catalytic performance,and finally,it proposes the strategies to improve the electrocatalytic performance and the future outlook in view of the key problems faced.
hydrogen peroxide(H2O2)catalystsoxygen reduction reactionelectrochemistrydensity functional theory
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