Interface engineering of a noble-metal-free 2D–2D MoS2/Cu-ZnIn2S4 photocatalyst for enhanced photocatalytic H2 production
| Autor: | Jing-Jing Wang, Zhigang Zou, Zhen-Tao Yu, Ling-Xia Yang, Wenguang Tu, Daqin Chen, Jiasong Zhong, Meijiao Liu, Yong-Jun Yuan |
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| Rok vydání: | 2017 |
| Předmět: |
Photocurrent
Aqueous solution Materials science Renewable Energy Sustainability and the Environment business.industry Quantum yield 02 engineering and technology General Chemistry engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Ascorbic acid 01 natural sciences 0104 chemical sciences Wavelength Semiconductor Chemical engineering engineering Photocatalysis Optoelectronics General Materials Science Noble metal 0210 nano-technology business |
| Zdroj: | Journal of Materials Chemistry A. 5:15771-15779 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c7ta04410k |
| Popis: | Accelerating the charge separation of semiconductor photocatalysts remains a great challenge to develop highly efficient solar-to-H2 conversion systems. Here, 2D Cu2+-doped ZnIn2S4 (Cu-ZnIn2S4) nanosheets modified with 2D MoS2 are designed and prepared via solution chemical routes. Detailed characterization reveals that the specially designed unique 2D–2D structure is critical to the high photocatalytic performance for solar H2 generation. Benefiting from the presence of a large 2D nanojunction in the 2D–2D photocatalyst, the MoS2/Cu-ZnIn2S4 has an increased contact surface area for charge transfer. The improved charge separation is demonstrated by the significant enhancement of photocurrent responses. It is found that the 2D–2D MoS2/Cu-ZnIn2S4 photocatalyst at a 6 wt% MoS2 loading amount exerts a 5463 μmol h−1 g−1 H2-evolution rate under visible light irradiation (λ > 420 nm) with an apparent quantum yield of 13.6% at wavelength λ = 420 nm in 0.1 M ascorbic acid aqueous solution. This activity far exceeds those of noble metal (such as Pt, Ru, Pd or Au) loaded-Cu-ZnIn2S4 photocatalysts. The results demonstrate that the construction of a 2D nanojunction is a promising strategy to accelerate charge separation and enhance the photocatalytic performance of semiconductor photocatalysts for solar H2 generation. |
| Databáze: | OpenAIRE |
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