Photocatalytic hydrogen peroxide splitting on metal-free powders assisted by phosphoric acid as a stabilizer

Yasuhiro Shiraishi (), Yuki Ueda, Airu Soramoto, Satoshi Hinokuma and Takayuki Hirai
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Yasuhiro Shiraishi: Osaka University
Yuki Ueda: Osaka University
Airu Soramoto: Osaka University
Satoshi Hinokuma: Kumamoto University
Takayuki Hirai: Osaka University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Hydrogen peroxide (H2O2) has received increasing attention as an energy carrier. To achieve a sustainable energy society, photocatalytic H2O2 splitting (H2O2 (l) → H2 (g) + O2 (g); ΔG° = + 131 kJ mol−1) is a desirable reaction for on-site H2 generation. However, this reaction has not been reported because conventional photocatalysis decomposes H2O2 by disproportionation (H2O2 (l) → H2O (l) + 1/2O2 (g); ΔG° = −117 kJ mol−1) and by promoting H2O2 reduction instead of H+ reduction. Here we report the successful example of H2O2 splitting. Visible light irradiation of a graphitic carbon nitride loaded with graphene quantum dots as co-catalysts (GQDs/g-C3N4) in a H2O2 solution containing phosphoric acid (H3PO4) produces H2. H3PO4 associates with H2O2 via hydrogen bonding, and this stabilization of H2O2 suppresses its reduction, thus promoting H+ reduction. The all-organic photosystem with H3PO4 as a stabilizer may provide a basis of photocatalytic H2O2 splitting.

Date: 2020
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DOI: 10.1038/s41467-020-17216-2

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