College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.
Dalton Trans. 2013 Sep 28;42(36):12998-3003. doi: 10.1039/c3dt51256h. Epub 2013 Jul 19.
CuS/Zn(0.8)Cd(0.2)S composites have been successfully prepared by simple hydrothermal and cation exchange method. The Cu species loaded on Zn(0.8)Cd(0.2)S, together with the intimate contact formed between CuS and Zn(0.8)Cd(0.2)S, was clearly demonstrated with X-ray photoelectron spectroscopy and transmission electron microscopy. The optimized CuS/Zn(0.8)Cd(0.2)S photocatalyst has a high H2 evolution rate of 2792 μmol g(-1) h(-1) at CuS content of 3 wt% and the apparent quantum efficiency of 36.7% at 420 nm. The photophysical mechanism of the photocatalytic activity was investigated with the help of surface photovoltage spectroscopy (SPS) and transient photovoltage (TPV) techniques. The results revealed that photogenerated charge separation efficiency in Zn(0.8)Cd(0.2)S was enhanced and the photogenerated electrons were trapped by the loaded CuS, which benefits photo-reduction. Those were the reasons for significant enhancement in the photocatalytic H2 evolution from water splitting.
通过简单的水热法和阳离子交换法成功制备了 CuS/Zn(0.8)Cd(0.2)S 复合材料。X 射线光电子能谱和透射电子显微镜清楚地表明，负载在 Zn(0.8)Cd(0.2)S 上的 Cu 物种与 CuS 和 Zn(0.8)Cd(0.2)S 之间形成了紧密接触。优化后的 CuS/Zn(0.8)Cd(0.2)S 光催化剂在 CuS 含量为 3wt%时具有 2792 μmol g(-1) h(-1)的高 H2 生成速率，在 420nm 时的表观量子效率为 36.7%。借助表面光电压谱（SPS）和瞬态光电压（TPV）技术研究了光催化活性的光物理机制。结果表明，Zn(0.8)Cd(0.2)S 中的光生载流子分离效率得到提高，光生电子被负载的 CuS 捕获，这有利于光还原。这就是水分解光催化 H2 产生显著增强的原因。
