Hydrogen Peroxide Synthesis via Enhanced Two-Electron Oxygen Reduction Pathway on Carbon-Coated Pt Surface

Continuous on-site electrochemical production of hydrogen peroxide (H2O2) can provide an attractive alternative to the present anthraquinone-based H2O2 production technology. A major challenge in the electrocatalyst design for H2O2 production is that O2 adsorption on the Pt surface thermodynamically favors “side-on” configuration over “end-on” configuration, which leads to a dissociation of O–O bond via dominant 4-electron pathway. This prefers H2O production rather than H2O2 production during the electrochemical oxygen reduction reaction (ORR). In the present work, we demonstrate that controlled coating of Pt catalysts with amorphous carbon layers can induce selective end-on adsorption of O2 on the Pt surface by eliminating accessible Pt ensemble sites, which allows significantly enhanced H2O2 production selectivity in the ORR. Experimental results and theoretical modeling reveal that 4-electron pathway is strongly suppressed in the course of ORR due to a thermodynamically unfavored end-on adsorption of ...

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