首页|Oxidation Evolution and Activity Origin of N-Doped Carbon in the Oxygen Reduction Reaction
Oxidation Evolution and Activity Origin of N-Doped Carbon in the Oxygen Reduction Reaction
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N-doped carbon materials,with their applications as electrocatalysts for the oxygen reduction reaction(ORR),have been extensively studied.However,a negletcted fact is that the operating potential of the ORR is higher than the theoretical oxida-tion potential of carbon,possibly leading to the oxidation of carbon materials.Consequently,the influence of the structural oxidation evolution on ORR performance and the real active sites are not clear.In this study,we discover a two-step oxida-tion process of N-doped carbon during the ORR.The first oxidation process is caused by the applied potential and bubbling oxygen during the ORR,leading to the oxidative dissolution of N and the formation of abundant oxygen-containing functional groups.This oxidation process also converts the reaction path from the four-electron(4e)ORR to the two-electron(2e)ORR.Subsequently,the enhanced 2e ORR generates oxidative H2O2,which initiates the second stage of oxidation to some newly formed oxygen-containing functional groups,such as quinones to dicarboxyls,further diversifying the oxygen-containing functional groups and making carboxyl groups as the dominant species.We also reveal the synergistic effect of multiple oxygen-containing functional groups by providing additional opportunities to access active sites with optimized adsorption of OOH*,thus leading to high efficiency and durability in electrocatalytic H2O2 production.
Oxygen reduction reactionN-doped carbonReaction pathStructural evolutionOxidation in reduction
Jiaqi Wu、Chuanqi Cheng、Shanshan Lu、Bin Zhang、Yanmei Shi
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Department of Chemistry,School of Science,Institute of Molecular Plus,Tianjin University,Tianjin 300072,China
School of Materials Science and Engineering,Institute of New Energy Materials,Tianjin University,Tianjin 300072,China
Tianjin Key Laboratory of Molecular Optoelectronic Science,Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300072,China
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