| Autor: |
Shiraishi, Yasuhiro, Ueda, Yuki, Soramoto, Airu, Hinokuma, Satoshi, Hirai, Takayuki |
| Předmět: |
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| Zdroj: |
Nature Communications; 7/7/2020, Vol. 11 Issue 1, p1-9, 9p |
| Abstrakt: |
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. While H2 can serve as a renewable fuel, its large scale production, storage, and transport are challenging. Here, authors show H2O2 to serve as a potential energy carrier via the photocatalytic production of H2 from stabilized H2O2 solutions and metal-free catalysts. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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