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.

过氧化氢（H ₂ O ₂）作为能量载体受到越来越多的关注。为了实现可持续的能源社会，光催化H ₂ O ₂分解（H ₂ O ₂（l）→H ₂（g）⁺ O ₂（g）；ΔG °= + 131 kJ mol ^-1）是理想的反应方法。现场H ₂生成。但是，该反应尚未报道，因为常规的光催化通过歧化作用分解H ₂ O ₂（H ₂ O ₂（l）→H ₂ O（l）+ 1 / 2O₂（g）；Δ ģ °= -117千焦摩尔^-1），并通过促进ħ ₂ ö ₂还原，而不是ħ ⁺还原。在这里，我们报告H ₂ O ₂分裂的成功例子。负载有石墨烯量子点作为助催化剂的石墨氮化碳（GQDs / gC ₃ N ₄）在含有磷酸（H ₃ PO ₄）的H ₂ O ₂溶液中的可见光照射会产生H ₂。H ₃ PO ₄与H ₂ O _2相关通过氢键，H ₂ O _2的这种稳定化抑制了其还原，从而促进了H ⁺还原。以H ₃ PO ₄为稳定剂的全有机光系统可以提供光催化H ₂ O ₂分解的基础。