Using photocatalysts to split water into hydrogen and oxygen is a promising way to produce renewable energy. Efficient and stable photocatalysts are desired for overall water splitting under visible light. We demonstrate that the cobalt(II) oxide (CoO)/graphitic carbon nitride (CoO/g-C₃N₄) composites synthesized by a one-step thermal decomposition method exhibit enhanced photocatalytic efficiency for overall water splitting without sacrificial reagents. 10%CoO/g-C₃N₄ exhibits optimal photocatalytic performance, where H₂ and O₂ evolution rates are, respectively, 0.46 μmol h⁻¹ and 0.21 μmol h⁻¹ under visible light irradiation without any sacrificial reagents. It is worth mentioning that the H₂ and O₂ production almost approaches the stoichiometric ratio 2:1. The enhanced photocatalytic activity of CoO/g-C₃N₄ may be ascribed to the efficient charge separation and fast decomposition of H₂O₂ by CoO.

中文翻译：

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通过热分解一步合成CoO / gC ₃ N ₄复合材料，无需牺牲试剂即可进行总水分解

使用光催化剂将水分解为氢和氧是生产可再生能源的一种有前途的方法。对于可见光下的总水分解，需要有效和稳定的光催化剂。我们证明了通过一步热分解方法合成的氧化钴（II）（CoO）/石墨碳氮化物（CoO / gC ₃ N ₄）复合材料在没有牺牲试剂的情况下显示出增强的总水分解光催化效率。10％CoO / gC ₃ N ₄表现出最佳的光催化性能，其中H ₂和O _2的释放速率分别为0.46μmolh ^-1和0.21μmolh ^-1在可见光照射下没有任何牺牲试剂。值得一提的是，H ₂和O _2的产量几乎接近化学计量比2 ：1。CoO/ gC ₃ N ₄的增强的光催化活性可以归因于CoO的有效电荷分离和H ₂ O ₂的快速分解。。