Recent progress on carbon-based electrocatalysts for hydrogen peroxide production via two-electron oxygen reduction reaction
The production of hydrogen peroxide(H2O2)via electrochemical two-electron(2e-)oxygen reduction reaction(ORR)is a green,safe and efficient technical route,showing broad development prospects as an alternative to the industrial anthraquinone process.However,this route at present is limited by the sluggish ORR kinetics and the competitive four-electron(4e-)reaction,and thus it is critically desired to develop efficient catalysts with high ORR activity and selectivity.Currently,carbon-based materials are the most widely studied catalysts for electrosynthesis of H2O2 via 2e-ORR and great progress has been made due to their abundance in earth,low cost and tunable catalytic properties.This review summarizes the recent advances in carbon-based electrocatalysts for 2e-ORR to H2O2.Fundamental principles of the ORR and general methods of electrocatalyst evaluation are first introduced and the basic design guidelines for constructing highly-efficient electrocatalyst is also pointed out.Next,with a focus on the non-metal carbon-based materials and transition-metal carbon-based materials,the active site optimization strategies of catalysts including heteroatom doping,defect engineering,pore engineering and single-atom site local environment regulation are in depth discussed.Finally,the challenges and future development trend in the field of H2O2 electrosynthesis by 2e-ORR are proposed in terms of H2O2 production medium,catalyst structure-performance relationship and steady production under industrial current densities.
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