CdS semiconductor is an excellent photo-catalyst for water-splitting to produce hydrogen. In this study, a binary photo-catalyst Ni3Se4@CdS enhancing hydrogen evolution activity under visible light irradiation was successfully synthesized and their photo-catalytic performance was investigated in detail by a series of characterization technologies. Ni3Se4@CdS sample reveals the higher hydrogen production activity compared with single Ni3Se4 or CdS samples under visible light-driven due to the existence of Ni3Se4 nanoparticels efficiently inhibits the recombination of electron–hole pairs for CdS nanorods as well as improves optical absorption density. Meanwhile, Ni3Se4@CdS catalyst shows the smaller over-potential than CdS nanorods, which also is an important factor to improve photo-catalytic hydrogen generation performance. The loading of Ni3Se4 particles improves the optical absorption intensity of CdS nanorods and enhances the photo-current response. At the same tine, Ni3Se4@CdS composite exhibits the smaller impedance compared with single CdS. Additionally, the surface elements component and specific surface area of the resulting samples also are studied. Finally, based on a great deal of research results, the possible mechanism of photo-catalytic water-splitting is speculated.

中文翻译：

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Ni3Se4 改性 CdS 纳米棒对高效制氢的增强作用

CdS 半导体是一种优良的光催化剂，用于分解水以产生氢气。本研究成功合成了一种在可见光照射下增强析氢活性的二元光催化剂Ni3Se4@CdS，并通过一系列表征技术对其光催化性能进行了详细研究。由于 Ni3Se4 纳米颗粒的存在，Ni3Se4@CdS 样品在可见光驱动下显示出比单个 Ni3Se4 或 CdS 样品更高的产氢活性，有效地抑制了 CdS 纳米棒的电子-空穴对复合并提高了光吸收密度。同时，Ni3Se4@CdS催化剂表现出比CdS纳米棒更小的过电位，这也是提高光催化产氢性能的重要因素。Ni3Se4 颗粒的负载提高了 CdS 纳米棒的光吸收强度并增强了光电流响应。在同一时间，Ni3Se4@CdS 复合材料与单个 CdS 相比表现出更小的阻抗。此外，还研究了所得样品的表面元素成分和比表面积。最后，基于大量的研究成果，推测了光催化分解水的可能机制。