All-solid-state direct Z-scheme NiTiO3/Cd0.5Zn0.5S heterostructures for photocatalytic hydrogen evolution with visible light
| Autor: | Sibo Wang, Wee-Jun Ong, Yidong Hou, Zhaoyu Wang, Wenjing Wang, Jiwu Zhao, Bifang Li, Zhengxin Ding, Bo Su |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Nanoparticle Quantum yield Heterojunction 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Photocatalysis General Materials Science Density functional theory Nanorod Charge carrier 0210 nano-technology Visible spectrum |
| Zdroj: | Journal of Materials Chemistry A. 9:10270-10276 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | The construction of NiTiO3/Cd0.5Zn0.5S heterostructures is presented as all-solid-state direct Z-scheme photocatalysts for the efficient and stable hydrogen production under visible light. The NiTiO3/Cd0.5Zn0.5S hybrids are assembled by growing Cd0.5Zn0.5S nanoparticles on the surface of NiTiO3 nanorods via a co-precipitation and hydrothermal coupled method. The compositional and structural features of the NiTiO3/Cd0.5Zn0.5S composites are fully disclosed via diverse physicochemical characterizations. The NiTiO3/Cd0.5Zn0.5S heterostructures are revealed to effectively capture the optical spectrum in the visible region as well as enhance the transfer and separation of photogenerated charge carriers through the Z-schematic pathway. Consequently, the optimized NiTiO3/Cd0.5Zn0.5S photocatalyst shows a high H2 production rate of 1058 μmol h−1 (26.45 mmol h−1 g−1), which is independent of any cocatalysts (such as Pt), together with a high apparent quantum yield (AQY) of 34% under monochromatic light irradiation at 420 nm. Besides, the NiTiO3/Cd0.5Zn0.5S composites also exhibit a high stability for the H2 evolution photocatalysis mainly due to the fact that the Z-schematic charge separation and migration can enable the efficient consumption of light-induced holes of Cd0.5Zn0.5S to prevent the photocorrosion effect. Finally, a possible photocatalytic H2 evolution mechanism over the Z-schematic NiTiO3/Cd0.5Zn0.5S heterostructures is also presented based on the results of the band structures, density functional theory (DFT) calculations and electron spin resonance (ESR) tests. |
| Databáze: | OpenAIRE |
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