Xiao Lingfeng, Su Tong, Wang Zhuo, Zhang Kun, Peng Xiaoniu, Han Yibo, Li Quan, Wang Xina
Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, China.
State Center for Designer Low-Carbon and Environmental Materials, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, China.
Nanoscale Res Lett. 2018 Feb 2;13(1):31. doi: 10.1186/s11671-018-2438-0.
NiP has been decorated on CdS nanowires or nanorods for efficient photocatalytic H production, whereas the specific surface area remains limited because of the large size. Here, the composites of CdZnS quantum dots (QDs) on thin NiP porous nanosheets with high specific surface area were constructed for noble metal-free photocatalytic H generation. The porous NiP nanosheets, which were formed by the interconnection of 15-30 nm-sized NiP nanoparticles, allowed the uniform loading of 7 nm-sized CdZnS QDs and the loading density being controllable. By tuning the content of NiP, H generation rates of 43.3 μM h (1 mg photocatalyst) and 700 μM h (100 mg photocatalyst) and a solar to hydrogen efficiency of 1.5% were achieved for the NiP-CdZnS composites. The effect of NiP content on the light absorption, photoluminescence, and electrochemical property of the composite was systematically studied. Together with the band structure calculation based on density functional theory, the promotion of NiP in charge transfer and HER activity together with the shading effect on light absorption were revealed. Such a strategy can be applied to other photocatalysts toward efficient solar hydrogen generation.
NiP已被修饰在CdS纳米线或纳米棒上用于高效光催化产氢，然而由于尺寸较大，其比表面积仍然有限。在此，构建了具有高比表面积的薄NiP多孔纳米片上的CdZnS量子点（QDs）复合材料，用于无贵金属光催化产氢。由15 - 30纳米大小的NiP纳米颗粒相互连接形成的多孔NiP纳米片，能够使7纳米大小的CdZnS QDs均匀负载且负载密度可控。通过调节NiP的含量，NiP - CdZnS复合材料实现了43.3 μM h（1毫克光催化剂）和700 μM h（100毫克光催化剂）的产氢速率以及1.5%的太阳能到氢能效率。系统研究了NiP含量对复合材料的光吸收、光致发光和电化学性质的影响。结合基于密度泛函理论的能带结构计算，揭示了NiP在电荷转移和析氢反应活性方面的促进作用以及对光吸收的遮蔽效应。这种策略可应用于其他光催化剂以实现高效太阳能制氢。
