Insights into the role of singlet oxygen in the photocatalytic hydrogen peroxide production over polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework

By Shen Zhao, Xu Zhao. Applied Catalysis B: Environmental, 2019

163 citations recorded by the source corpus.

Abstract To develop a new strategy of enhancing the photoinduced holes (h+) consumption to promote the photoinduced electrons (e−) utilization for O2 reduction to H2O2 and maintaining the chemical stability of g-C3N4-based catalysts, the hybrid catalyst of g-C3N4-CoWO has been prepared through the calcination of the graphitic carbon nitride (g-C3N4) precursor of 3-amino 1, 2, 4-triazole (3-AT) and the polyoxometalates (POMs) precursor of (NH4)8Co2W12O42 (NH4-Co2W12). The hybrid catalyst of g-C3N4-CoWO with well-defined and stable structure exhibits efficient catalytic performance (9.7 μmol h-1) for photocatalytic H2O2 production in the absence of organic electron donor under visible light. The value of electrons transfer during the oxygen reduction reaction (ORR) process obtained from the Koutecky-Levich plot for g-C3N4-CoWO (n = 1.95) is higher than that for g-C3N4 (n = 1.18), suggesting that the CoWO incorporated into g-C3N4 framework can generate more e− for O2 reduction. The superoxide radicals ( O2-) quantitative and scavenger experiments combined with the electron spin resonance (ESR) results reveal that the negative shifts of the conduction band (CB) level from g-C3N4 to g-C3N4-CoWO can enhance the single-electron reduction of O2 to O2-. The h+ and 1O2 scavenger experiments results combined with the ESR results demonstrate that the CoWO incorporated into g-C3N4 framework can promote the oxidation of O2- to 1O2 by h+. The 1O2 quantitative experiments results indicate that the 1O2 can proceed two-electron reduction to H2O2. The enhanced h+ consumption and the 1O2 transferred from O2- can promote the photocatalytic H2O2 production over g-C3N4-CoWO. In addition, the recycle experiment results reveal that the heterogeneous g-C3N4-CoWO is catalytic stable.

Subfields: Electrical and Electronic Engineering, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/ef82a54f6fe0607bd2980052722fed8b493cbe4f

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In Electrical and Electronic Engineering

  1. Yongfa Zhu
  2. W. Yao
  3. J. Xiong

In Materials Chemistry

  1. W. Yao
  2. Yongfa Zhu
  3. Zhi Chen
  4. Xibao Li
  5. J. Xiong
  6. Juntong Huang

In Renewable Energy, Sustainability and the Environment

  1. Yongfa Zhu
  2. W. Yao
  3. Zhi Chen
  4. Xibao Li
  5. J. Xiong
  6. Juntong Huang
  7. Liwu Zhang

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