Efficient co-catalysts are crucial for photocatalytic water oxidation towards conversion of solar energy into chemical energy. Herein, we develop a sustainable and effective water oxidation system using graphitic carbon nitride (g-C₃N₄) and cubic cobalt manganese spinel (c-CoMn₂O₄) as light transducer and water oxidation co-catalyst, respectively. The surface modified g-C₃N₄ with c-CoMn₂O₄ not only accelerates the interface transfer rate of charge carriers but also reduces the excessive energy barrier for OO formation, leading to an enhanced photocatalytic activity of water oxidation. Benefiting from the well surface engineering of g-C₃N₄, the g-C₃N₄-CoMn₂O₄ (CN-CM) composites exhibit an enhanced performance of photocatalytic water oxidation. The oxygen evolution rate (OER) of CN-CM is 4 times higher than that of pristine g-C₃N₄. It is a highly active in oxidation of water, with an apparent quantum yield (AQY) of ca. 1% at 380 nm with AgNO₃ as sacrificial agent. This improvement is mainly due to the mixed-valence Co and Mn cations contained in c-CoMn₂O₄ spinel.

高效的助催化剂对于光催化水氧化将太阳能转化为化学能至关重要。在本文中，我们开发了一种可持续且有效的水氧化系统，该系统分别使用石墨氮化碳（gC ₃ N ₄）和立方钴锰尖晶石（c-CoMn ₂ O ₄）作为光传感器和水氧化助催化剂。用c-CoMn ₂ O ₄表面改性的gC ₃ N ₄不仅可以加速电荷载流子的界面传输速率，而且可以降低O的过多能垒。O的形成，导致水氧化的增强的光催化活性。得益于gC ₃ N ₄的良好表面工程，gC ₃ N ₄ -CoMn ₂ O ₄（CN-CM）复合材料表现出增强的光催化水氧化性能。CN-CM的氧释放速率（OER）是原始gC ₃ N _4的4倍。它在水的氧化中具有很高的活性，表观量子产率（AQY）约为1。以AgNO ₃为牺牲剂，在380 nm处为1％。这种改善主要是由于c-CoMn ₂ O _4中包含的混合价Co和Mn阳离子 尖晶石。