Zang Shaohong, Cai Xiaorong, Chen Mengshan, Teng Dehong, Jing Fei, Leng Zhe, Zhou Yingtang, Lin Feng
Institute of Innovation & Application, National Engineering Research Center for Marine Aquaculture, Zhejiang Ocean University, Zhoushan 316022, China.
College of Chemical and Materials Engineering, Quzhou University, Quzhou 324000, China.
Nanomaterials (Basel). 2022 Jun 5;12(11):1931. doi: 10.3390/nano12111931.
Photocatalytic water splitting is one of the promising approaches to solving environmental problems and energy crises. However, the sluggish 4e transfer kinetics in water oxidation half-reaction restricts the 2e reduction efficiency in photocatalytic water splitting. Herein, cobalt vanadate-decorated polymeric carbon nitride (named CoVO/PCN) was constructed to mediate the carrier kinetic process in a photocatalytic water oxidation reaction (WOR). The photocatalysts were well-characterized by various physicochemical techniques such as XRD, FT-IR, TEM, and XPS. Under UV and visible light irradiation, the O evolution rate of optimized 3 % CoVO/PCN reached 467 and 200 μmol h g, which were about 6.5 and 5.9 times higher than that of PCN, respectively. Electrochemical tests and PL results reveal that the recombination of photogenerated carriers on PCN is effectively suppressed and the kinetics of WOR is significantly enhanced after CoVO introduction. This work highlights key features of the tuning carrier kinetics of PCN using charge-conducting materials, which should be the basis for the further development of photocatalytic O reactions.
光催化水分解是解决环境问题和能源危机的一种很有前景的方法。然而，水氧化半反应中缓慢的4e转移动力学限制了光催化水分解中的2e还原效率。在此，构建了钒酸钴修饰的聚合氮化碳（命名为CoVO/PCN）以介导光催化水氧化反应（WOR）中的载流子动力学过程。通过XRD、FT-IR、TEM和XPS等各种物理化学技术对光催化剂进行了充分表征。在紫外光和可见光照射下，优化后的3% CoVO/PCN的析氧速率分别达到467和200 μmol h g，分别比PCN高约6.5倍和5.9倍。电化学测试和PL结果表明，CoVO引入后，PCN上光生载流子的复合得到有效抑制，WOR的动力学显著增强。这项工作突出了使用电荷传导材料调节PCN载流子动力学的关键特征，这应该是光催化析氧反应进一步发展的基础。
