Construction of oxygen-enriched graphitic carbon nitride polymers for highly efficient and selective H2O2 production via photocatalytic O2 reduction.

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The overall water splitting efficiency is mainly restricted by the slowkinetics of oxygen evolution. Therefore,it is essential to develop active oxygen evolution catalysts.Inthis context, we designed and synthesized atungsten oxide catalyst with oxygen vacancies for photocatalytic oxygen evolution, which exhibited ah igher oxygen evolution rate of 683 mmol h À1 g À1 than that of pure WO 3 (159 mmol h À1 g À1). Subsequent studies through transient absorption spectroscopy found that the oxygen vacancies can produce electron trapping states to inhibit the direct recombination of photogenerated carriers.Additionally,aPt cocatalyst can promote electron trap states to participate in the reaction to improve the photocatalytic performance further.T his work uses femtosecond transient absorption spectroscopytoexplain the photocatalytic oxygen evolution mechanism of inorganic materials and provides new insights into the design of high-efficiency watersplitting catalysts.

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