Concentrated solar photocatalysis for hydrogen generation from water by titania-containing gold nanoparticles |
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| Affiliation: | 1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao 266580, PR China;2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;4. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, PR China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. Guangdong Provincial Key Laboratory of Distributed Energy Systems, School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, China;2. School of Computer Science and Technology, Dongguan University of Technology, Dongguan 523808, China;3. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;4. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China;5. Beijing Engineering Research Center of Sustainable Energy and Buildings, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;6. Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing 100089, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Photocatalysis is an effective way to utilize solar energy to produce hydrogen from water. Au/TiO2 nanoparticles (NPs) have a better performance in photocatalytic hydrogen generation because of the localized surface plasmon resonance (LSPR) effect of Au/TiO2 NPs. In the photocatalytic hydrogen generation experiments, it was found that light intensity plays a key role in the photocatalytic reaction rate of Au/TiO2 NPs. At a light intensity of 0–7 kW/m2, the reaction rate has a super-linear law dependence on the light intensity (Rate ∝ Intensityn, with n > 1). However, at a light intensity of 7–9 kW/m2, the dependency becomes sub-linear (n < 1). This means that the increase rate of photocatalytic rate is smaller than that of light intensity when the light intensity exceeds 7 kW/m2. In addition, the finite element method (FEM) was utilized to further elucidate the role of light intensity by calculating the absorption power and nearfield intensity mapping of a Au/TiO2 nanoparticle. The variation trend of the calculated total absorption power agrees with the photocatalytic experimental results for different light intensities. These results shed light on the utilization of concentrated solar photocatalysis to increase the solar-to-hydrogen performance of Au/TiO2 NPs. |
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| Keywords: | Photocatalytic hydrogen generation Light intensity LSPR FEM simulations |
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