Construction of ZnIn2S4/CdS/PdS S-Scheme Heterostructure for Efficient Photocatalytic H2 Production |
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| Authors: | Guotai Sun Zige Tai Fan Li Qian Ye Ting Wang Zhiyu Fang Lichao Jia Wei Liu Hongqiang Wang |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072 China;2. School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119 China;3. Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094 China |
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| Abstract: | It is facing a tremendous challenge to develop the desirable hybrids for photocatalytic H2 generation by integrating the advantages of a single semiconductor. Herein, an all-sulfide ZnIn2S4/CdS/PdS heterojunction is constructed for the first time, where CdS and PdS nanoparticles anchor in the spaces of ZnIn2S4 micro-flowers due to the confinement effects. The morphology engineering can guarantee rapid charge transfer owing to the short carrier migration distances and the luxuriant reactive sites provided by ZnIn2S4. The S-scheme mechanism between ZnIn2S4 and CdS assisted by PdS cocatalyst is testified by in situ irradiated X-ray photoelectron spectroscopy and electron paramagnetic resonance (EPR), where the electrons and holes move in reverse driven by work function difference and built-in electric field at the interfaces. The optimal ZnIn2S4/CdS/PdS performs a glaring photocatalytic activity of 191.9 µmol h−1 (10 mg of catalyst), and the largest AQE (apparent quantum efficiency) can reach a high value of 26.26%. This work may afford progressive tactics to design multifunctional photocatalysts. |
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| Keywords: | co-catalysts hydrogen generation photocatalysis S-scheme mechanisms water splitting |
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