采用原位光沉积方法将铂纳米颗粒(Pt NPs)负载在核-壳异质纳米棒ZnO@ZnS表面,制备出ZnO@ZnS/Pt复合光催化剂。调控Pt NPs在ZnO@ZnS表面的负载量,探究了不同质量的Pt NPs对光催化产氢气性能的影响。结果表明,当贵金属Pt的负载量为2%(ZnO@ZnS/Pt-2)时,复合光催化产H₂性能最好,产氢速率为4.52 mmol/(g·h),是ZnO@ZnS的1.8倍,催化剂表现出优异的催化稳定性。在此复合材料中,贵金属Pt纳米颗粒作为助催化剂,Pt对H⁺具有较低的吸附能,优先吸附H⁺,光生电子转移到Pt纳米粒子表面,H⁺在其表面得到光生电子,被还原为氢气,成功地抑制了光生电子和空穴的复合,有效地提升了催化剂的催化性能。

ZnO@ZnS/Pt composite photocatalyst is synthesized through loading Pt nanoparticles on the surface of ZnO@ZnS core-shell nanorods via in-situ photo-deposition method.The loading amount of Pt nanoparticles on the surface of ZnO@ZnS is adjusted to investigate the influence on the performance of ZnO@ZnS/Pt composite photocatalyst in photocatalytic hydrogen production.Experimental results show that the hydrogen production performance of composite photocatalysis reaches the best when the composite photocatalyst with a Pt loading amount of 2% (ZnO@ZnS/Pt-2) is served.The hydrogen production rate is 4.52 mmol·g^-1·h^-1,which is 1.8 times that over ZnO@ZnS.The composite photocatalyst also shows excellent catalytic stability.Pt nanoparticles are used as cocatalyst in this composite photocatalyst.Pt needs low adsorption energy for H⁺ and adsorbs H⁺ preferentially.Photogenerated electrons are transferred to the surface of Pt nanoparticles,and H⁺ is reduced to hydrogen by electrons on its surface,which effectively inhibits the recombination of photogenerated electrons and holes,and improves the catalytic performance of the composite catalyst.

朱泉雯(1982-),女,硕士,副教授,研究方向为环境分析、无机化学,1040778057@qq.com;侯建华(1984-),男,博士,副教授,博士生导师,研究方向为环境资源利用,通讯联系人,jhhou@yzu.edu.cn。