ZnO and TiO2 are wide bandgap semiconductors and have good photocatalytic hydrogen production capability in the ultraviolet region but do not have visible light response capability. If the absorption spectrum is extended to the visible light band, the full spectrum energy of sunlight can be fully utilized, and the practical application has great potential. At the same time, the sulfide system is favored because of its simple preparation process, relatively stable chemical properties, visible light band response, high energy conversion efficiency, and good compatibility with other material systems. Therefore, it can be considered that the ZnO@TiO2 core-shell nanorods are loaded with sulfide nanoparticles, and the formation of PN heterojunctions has a good visible light response.
Dong Wenfei, a researcher at the Laboratory of Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, led the research team to improve the hydrothermal synthesis method and prepare ultra-long ZnO@TiO2 core-shell nanowires on the basis of previous studies (Figure 1). By loading the surface of the sulfide solid solution ZnIn0.25Cu0.02S1.395, a thin film electrode material with a high specific surface area was obtained, and the wide band gap semiconductor was combined with the narrow band gap semiconductor to expand the light absorption from the ultraviolet band to the visible band. At the same time, the step energy band structure and interface electron transport properties of the PN heterojunction in the nanorod array are discussed in detail (Fig. 2), and the photoelectrochemical properties are characterized (Fig. 3) and visible light catalytic cracking of hydrogen production capability (fig. 4).
Studies have shown that this material has good light absorption characteristics in the visible light band, stable chemical properties, high energy conversion efficiency, no toxicity to the environment and good compatibility with other material systems. In particular, it has good photocatalytic hydrogen production capabilities, and is easy to integrate with micro-nano optoelectronic devices, and has good application prospects in the fields of energy and nanophotonics. The related results were published in Nanoscale, 2015, 7: 11082-11092.
The above work was supported by the National Natural Science Foundation of China, the National Major Basic Research Project, the China International Science and Technology Cooperation Project, the Science and Technology Department of Jilin Province, the Science and Technology Bureau of Suzhou City, and the “Hundred Talents Program†of the Chinese Academy of Sciences.
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