Xiang JingJing, Wang Hanbin, Wang Xina, Chen Xu, Wu Tianci, Wan Houzhao, Liu Yongzheng, Wang Hao
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Faculty of Physics and Electronic Science, Hubei University Wuhan 430062 China
RSC Adv. 2019 Jan 30;9(7):4001-4007. doi: 10.1039/c8ra09408j. eCollection 2019 Jan 25.
Cd Zn S nanocrystals with sizes ranging from 3-11 nm were synthesized by a simple organic solution method. The nanocrystals possess a cubic zinc-blende structure and the bandgap blue-shifts from 2.1 eV to 3.4 eV by increasing the composition of Zn ions in the solid solutions. After a facile ligand exchange process, the photocatalytic activity for H production of the Cd Zn S nanocrystals was investigated under visible-light irradiation ( ≥ 420 nm) with NaSO/NaS as the electron donor. It was found that the CdZnS had the highest photoactivity with H evolution rate of 6.32 mmol g h. By adding Pt precursors into the reaction solution, inhomogenous Pt-Cd Zn S nanoheterostructures were formed, which accounted for a 30% enhancement for the H evolution rate comparing with that of pure CdZnS nanocrystals. This work highlights the use of facile organic synthesis in combination with suitable surface modification to enhance the activity of the photocatalysts.
采用简单的有机溶液法合成了尺寸范围为3 - 11纳米的CdZnS纳米晶体。这些纳米晶体具有立方闪锌矿结构，通过增加固溶体中锌离子的组成，其带隙从2.1电子伏特蓝移至3.4电子伏特。经过简便的配体交换过程后，以NaSO/NaS作为电子供体，在可见光照射（≥420纳米）下研究了CdZnS纳米晶体的光催化产氢活性。结果发现，CdZnS具有最高的光活性，产氢速率为6.32毫摩尔/克·小时。通过向反应溶液中加入铂前驱体，形成了不均匀的Pt - CdZnS纳米异质结构，与纯CdZnS纳米晶体相比，其产氢速率提高了30%。这项工作突出了利用简便的有机合成方法并结合合适的表面修饰来提高光催化剂的活性。
