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Issue 9, 2018
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Efficient visible-light-driven selective oxygen reduction to hydrogen peroxide by oxygen-enriched graphitic carbon nitride polymers

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Abstract

H2O2 is a green, environmentally friendly potential energy source. The photocatalytic reduction of molecular oxygen to synthesise H2O2 is an eco-friendly strategy compared with the anthraquinone method and H2/O2 direct synthesis. We proposed oxygen-enriched carbon nitride polymer (OCN) models, which were proven to more easily produce 1,4-endoperoxide species and have a high selectivity for molecular oxygen reduction to H2O2, rather than superoxide radicals, through theoretical calculations and experiments. The apparent quantum yield for H2O2 production by OCNs reached 10.2% at 420 nm under an O2 atmosphere, which was 3.5 times higher than that of g-C3N4 and the activity did not decay over 20 h. OCN has a better oxygen reducibility and electron–hole separation efficiency than g-C3N4 and is more prone to 2-electron reduction in the ORR. This work promotes understanding of the mechanism of photocatalytic oxygen reduction and provides a new idea for the design and synthesis of new materials for the preparation of H2O2.

Graphical abstract: Efficient visible-light-driven selective oxygen reduction to hydrogen peroxide by oxygen-enriched graphitic carbon nitride polymers

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Publication details

The article was received on 04 May 2018, accepted on 18 Jun 2018 and first published on 20 Jun 2018


Article type: Paper
DOI: 10.1039/C8EE01316K
Citation: Energy Environ. Sci., 2018,11, 2581-2589
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    Efficient visible-light-driven selective oxygen reduction to hydrogen peroxide by oxygen-enriched graphitic carbon nitride polymers

    Z. Wei, M. Liu, Z. Zhang, W. Yao, H. Tan and Y. Zhu, Energy Environ. Sci., 2018, 11, 2581
    DOI: 10.1039/C8EE01316K

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