Luo Ying, Zhang Xiaohui, Huang Cheng, Han Xiaole, Jiang Qingqing, Zhou Tengfei, Yang Haijian, Hu Juncheng
Hubei Key Laboratory of Catalysis and Materials Science, School of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, China.
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.
ACS Omega. 2021 May 21;6(21):13544-13553. doi: 10.1021/acsomega.0c06038. eCollection 2021 Jun 1.
Facilitating charge separation and increasing surface active sites have always been the goals of photocatalysis. Herein, we synthesized a Ni-doped ZnCdS hollow sphere photocatalyst with a facile one-step hydrothermal method. Energy-dispersive spectroscopy mapping showed the high dispersion of Ni ions in the ZnCdS hollow spheres. The experimental results confirmed that Ni doping reduced the band structure of the substrate, suppressed the recombination of photo-induced electrons and holes, and provided more reactive sites. Therefore, the photocatalytic activity had been greatly improved. As a consequence, the detected photocatalytic H evolution rate increased up to 33.81 mmol·h·g over an optimal Ni doping (5 wt %) of ZnCdS hollow spheres, which was 20.87-fold higher than that of pure CdS. Elemental mapping showed that the Zn element was mainly distributed in the outermost layer of the hollow spheres; this might be the critical factor that enabled Ni-doped Zn Cd S to maintain excellent stability.
促进电荷分离和增加表面活性位点一直是光催化的目标。在此，我们采用简便的一步水热法合成了一种镍掺杂的ZnCdS空心球光催化剂。能量色散光谱映射显示镍离子在ZnCdS空心球中高度分散。实验结果证实，镍掺杂降低了基底的能带结构，抑制了光生电子和空穴的复合，并提供了更多的活性位点。因此，光催化活性得到了极大提高。结果，在ZnCdS空心球的最佳镍掺杂量（5 wt%）下，检测到的光催化析氢速率提高到33.81 mmol·h·g，比纯CdS高20.87倍。元素映射表明，锌元素主要分布在空心球的最外层；这可能是使镍掺杂的ZnCdS保持优异稳定性的关键因素。
