Abstract The construction of heterojunction plays a key role in solving the charge separation and transfer at the interface of photocatalyst. Herein, a new type of step-scheme (S-scheme) heterojunction was formed by growing cobalt oxide (CoO) in situ on porous graphitic carbon nitride (PCN) to convert CO2 to CO. The porous structure of PCN can increase the absorption of CO2 and act as an active site. The special charge separation of S-scheme heterojunction can give CoO/PCN system with strong redox ability. And S-scheme heterojunction can accelerate charge separation and transfer at the interface. Compared with CoO and PCN, CoO/PCN composites exhibits a higher CO2 reduction rate (40.31 μmol g-1h−1), 3.43 and 23.85 times higher than that of CoO (11.73 μmol g-1h−1) and PCN (1.69 μmol g-1h−1), respectively.

中文翻译：

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用于高效 CO2 光还原的新型 CoO/多孔石墨氮化碳 S 型异质结的制备

摘要 异质结的构建对于解决光催化剂界面的电荷分离和转移问题具有关键作用。在此，通过在多孔石墨氮化碳 (PCN) 上原位生长氧化钴 (CoO) 将 CO2 转化为 CO，形成了一种新型的阶梯式 (S-scheme) 异质结。 PCN 的多孔结构可以增加对CO2 并充当活性位点。S-scheme异质结的特殊电荷分离可以使CoO/PCN体系具有很强的氧化还原能力。S-scheme异质结可以加速界面处的电荷分离和转移。与CoO和PCN相比，CoO/PCN复合材料表现出更高的CO2还原率（40.31 μmol g-1h-1），分别是CoO（11.73 μmol g-1h-1）和PCN（1.69 μmol g-1h-1）的3.43和23.85倍-1h-1)，分别。