Photocatalytic hydrogen production from overall water splitting is a clean and renewable technology that can convert solar energy into chemical energy, for which developing an efficient and stable photocatalyst has been the central scientific topic. Herein, CoO/g-C₃N₄ heterojunction photocatalysts were fabricated through a facile solvothermal method for overall water splitting. Simultaneous evolution of H₂ and O₂ from pure water with the stoichiometric ratio of about 2:1 achieved with all the CoO/g-C₃N₄ heterojunctions as catalysts under visible light irradiation. Among of them, 30 wt.% CoO/g-C₃N₄ with H₂ evolution rate of 2.51 μmol/h and O₂ evolution rate of 1.39 μmol/h also exhibited remarkably higher photocatalytic performance and stability (over 15 cycles) than single CoO or g-C₃N₄. This enhanced photocatalytic activity of CoO/g-C₃N₄ heterojunction can be ascribed to the synergistic effect of junction and interface formed between CoO and g-C₃N₄. In addition, the sufficient long lifetime stability of CoO/g-C₃N₄ comes from the complementary advantages effect between CoO and g-C₃N₄, as is proved, CoO can protect g-C₃N₄ from H₂O₂ poisoning, and simultaneously the photo-induced heat from CoO during the photocatalytic process responsible for the rapid deactivation can be timely conducted to g-C₃N₄.

整体水分解产生的光催化氢是一种清洁和可再生的技术，可以将太阳能转化为化学能，为此，开发高效稳定的光催化剂一直是中心科学课题。在此，通过简便的溶剂热法制备CoO / gC ₃ N ₄异质结光催化剂，进行总水分解。在可见光照射下，使用所有CoO / gC ₃ N ₄异质结作为催化剂，可以从化学计量比约为2：1的纯水中同时释放H ₂和O ₂。其中，有30wt。％的CoO / gC ₃ N ₄与H _2。与单一的CoO或gC ₃ N ₄相比，其2.51μmol/ h的析出速率和1.39μmol/ h的O ₂析出速率也表现出显着更高的光催化性能和稳定性（超过15个循环）。CoO / gC ₃ N ₄异质结的这种增强的光催化活性可以归因于CoO和gC ₃ N ₄之间形成的结和界面的协同作用。另外，CoO / gC ₃ N ₄的足够长的使用寿命稳定性来自于CoO和gC ₃ N ₄之间的互补优势效应，事实证明，CoO可以保护gC ₃ NH ₂ O ₂中毒引起的图_{4所示的反应}，同时可以迅速将负责快速失活的光催化过程中CoO产生的光诱导热量传导至gC ₃ N ₄。