Separation of hot electrons and holes in Au/LaFeO3 to boost the photocatalytic activities both for water reduction and oxidation |
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| Affiliation: | 1. Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;3. School of Mathematical Science and Engineering, Hebei University of Engineering, Handan, 056038, China;4. Department of Physics, Faculty of Science, Jiangsu University, Zhenjiang, 212013, China;5. School of Science, Key Laboratory of Luminescence and Optical Information (Ministry of Education), Beijing JiaoTong University, Beijing, 100044, China;6. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing, 100094, China;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;2. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;4. Desert Vista High School, Phoenix, AZ 85048, USA;1. State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;2. Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, Ningde Normal University, Ningde 352100, China;1. Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy;2. Department of Civil Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy;1. State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People''s Republic of China;2. State Key Laboratory of Materials Processing and Die &Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, People''s Republic of China;3. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, People''s Republic of China |
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| Abstract: | Construction of plasmon-based nanostructures is an effective way to enhance the photocatalytic activities of semiconductor photocatalysts for water-splitting. However, the synergistic effect of plasmon-related hot electrons and holes for water splitting in the plasmon-hybrid photocatalyst is rarely considered. Herein, we construct a plasmon-based Au/LaFeO3 composite photocatalyst to investigate the complex roles of hot electrons and holes for solar water splitting. Benefiting from the formation of Schottky junction and surface plasmon resonance effect of the Au nanoparticles, the synthesized photocatalyst exhibits an excellent photocatalytic activity for each half-reaction of water splitting, and the rates for H2 and O2 generation are obtained as high as 202 μmol g?1 h?1 and 23 μmol g?1 h?1, respectively. Moreover, an in-depth investigation reveals that the improved hydrogen evolution is caused by the hot electron injection from Au to LaFeO3, and the hot holes in Au induced by the separation of hot charges can initiate the water oxidation directly on the surface of gold. Thus, this work provides a new insight into the synergistic effect of plasmon-related hot electrons and holes for boosting the photocatalytic reactions. |
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| Keywords: | Water splitting Schottky barrier Surface plasmon resonance Separation of hot charges |
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