Chen Lu, Liu Xiyao, Wang Deling, Xia Yuzhou, Yan Guiyang, Huang Xueyan, Wang Xuxu
Department of Chemistry, Fujian Province University Key Laboratory of Green Energy and Environment Catalysis, Ningde Normal University, Ningde 352100, PR China.
School of Automobile, Fujian Chuanzheng Communications College, Fuzhou, 350002, PR China.
Dalton Trans. 2023 Feb 28;52(9):2845-2852. doi: 10.1039/d2dt03925g.
Knowledge of the photocatalytic H-evolution mechanism is of critical importance for water splitting, and for designing active catalysts for a sustainable energy supply. In this study, we prepared plasmon Au-modified K-doped defective graphitic carbon nitride (Au/KCNx) and then applied it in photocatalytic hydrogen-production tests. The hydrogen-production rate of the Au/KCNx photocatalyst (8.85 mmol g h) was found to be almost 104 times higher than that of Au/g-CN (0.085 mmol g h), together with an apparent quantum efficiency of 12.8% at 420 nm. It could significantly improve the photocatalytic activities of the Au/KCNx sample, which was attributed to the synergistic effects of the plasmon effect, potassium doping, and nitrogen vacancy. In addition, the Au/KCNx photocatalyst had a large surface area, which was beneficial for photogenerated carrier separation and transfer. The novel strategy proposed here is a potential new method for the development of graphitic carbon nitride photocatalysts with obviously enhanced activities.
了解光催化析氢机制对于水分解以及设计用于可持续能源供应的活性催化剂至关重要。在本研究中，我们制备了等离子体金修饰的钾掺杂缺陷石墨相氮化碳（Au/KCNx），并将其应用于光催化产氢测试。发现Au/KCNx光催化剂的产氢速率（8.85 mmol g⁻¹ h⁻¹）几乎比Au/g-CN（0.085 mmol g⁻¹ h⁻¹）高104倍，在420 nm处的表观量子效率为12.8%。它可以显著提高Au/KCNx样品的光催化活性，这归因于等离子体效应、钾掺杂和氮空位的协同作用。此外，Au/KCNx光催化剂具有较大的表面积，这有利于光生载流子的分离和转移。这里提出的新策略是开发具有明显增强活性的石墨相氮化碳光催化剂的一种潜在新方法。
