Li Fengyuan, Hou Yanping, Yu Zebin, Qian Lun, Sun Lei, Huang Jun, Ran Qi, Jiang Ronghua, Sun Qianqian, Zhang Heqing
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, PR China.
Nanoscale. 2019 Jun 6;11(22):10884-10895. doi: 10.1039/c8nr10230a.
An oxygen deficiency modified Z-scheme CdS/WO3-x nanohybrid with MoS2 as the cocatalyst was synthesized by a microwave hydrothermal method and was used for photocatalytic hydrogen production under visible light irradiation. Loadings of WO3-x and MoS2 as well as the synthesis time of the microwave-assisted hydrothermal process were optimized, and the physicochemical and optical properties of the as-prepared photocatalysts were characterized by various techniques. Results showed that the material with 30 wt% of WO3-x, 0.1 wt% of MoS2 and a preparation time of 120 minutes exhibited the most desirable morphology and structure for hydrogen production. The maximum hydrogen production of 2852.5 μmol g-1 h-1 was achieved, which was 5.5 times that of pure CdS (519.1 μmol g-1 h-1) and 1.5 times that of CdS/30 wt% WO3-x (1879.0 μmol g-1 h-1), and the external quantum efficiency (EQE) reached 10.0% at 420 nm. The improvement of photocatalytic performance could be attributed to the Z-scheme formed between CdS and WO3-x and MoS2 as an electron trap. It is worth mentioning that the size of the composite had a negative correlation with the H2 production rate.
采用微波水热法合成了以MoS2为助催化剂的缺氧改性Z型CdS/WO3-x纳米杂化物，并将其用于可见光照射下的光催化产氢。对WO3-x和MoS2的负载量以及微波辅助水热过程的合成时间进行了优化，并采用多种技术对所制备光催化剂的物理化学和光学性质进行了表征。结果表明，WO3-x含量为30 wt%、MoS2含量为0.1 wt%且制备时间为120分钟的材料表现出最理想的产氢形态和结构。实现了2852.5 μmol g-1 h-1的最大产氢量，是纯CdS（519.1 μmol g-1 h-1）的5.5倍，是CdS/30 wt% WO3-x（1879.0 μmol g-1 h-1）的1.5倍，且在420 nm处的外量子效率（EQE）达到10.0%。光催化性能的提高可归因于CdS与WO3-x之间形成的Z型结构以及MoS2作为电子陷阱。值得一提的是，复合材料的尺寸与产氢速率呈负相关。
