Insights into morphology-dependent Au/TiO2catalyst in glycerol aqueous solutions towards photothermal reforming hydrogen production |
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| Affiliation: | 1. Smart Energy Research Center, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, PR China;2. Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China;3. School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou, 221116, China;1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Kunshan Loujiang Experimental School, Suzhou, Jiangsu 215300, China;1. Civil and Environmental Engineering Department, UAE University, P.O. Box 15551, Al Ain, United Arab Emirates;2. Chemical and Petroleum Engineering Department, UAE University, P.O. Box 15551, Al Ain, United Arab Emirates;3. Department of Chemistry M D University, Rohtak, 124001 India;1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China;2. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. Wenzhou Institute, University of Chinese Academy of Sciences, Jinlian Street, Wenzhou, 325001, China;4. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;5. Zhengzhou Research Institute of Harbin Institute of Technology, China;1. Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;2. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China;3. Jiangsu Provincial Key Laboratory of Eco-Environmental Materials, Yancheng Institute of Technology, Yancheng 224051, China |
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| Abstract: | Probing the effect of spatial morphology of catalyst on its photothermal catalytic performance is crucial for solar-driven renewable catalytic reforming of hydrogen production. In this study, Au nanoparticles loaded on various morphologies of TiO2 nanoparticles were synthesized and characterized. The experimental results indicated that decorating TiO2 with Au nanoparticles could dramatically increase its photocatalytic activities by 20–40 times. The photothermal conversion efficiency of Au/TiO2 (12.74%–25.54%) was higher than those of TiO2 due to the introduction of LSPR of Au nanoparticles could effectively improve the utilization of solar spectrum. Titania nanoflower (TNF) nanoparticles with high light absorption capacity, better colloidal dispersion stability, porous properties and narrow band gap represented the highest H2 productivity (144.13 μmol·g−1·h−1). The coarse surface structure was also conducive to the dispersion of gold particles on the surface of the carrier and the growth rate of Au/TNF hydrogen production (40 times) which was higher than that of other morphology within 2 h. The results of glycerol photothermal hydrogen generation highlighted the effect of temperature on colloidal dispersion stability and hydrogen production capability of nanoparticle suspension. It demonstrated that the photothermal effect aroused a temperature rise that would deteriorate the dispersion stability of the suspension although a local entropy increase in the catalyst nanoparticles might occur. At the same time, the temperature rise caused by the photothermal effect efficiently produces hydrogen in the reaction temperature range. Therefore, an ideal temperature setting for maximal hydrogen generation could be validated and improved the photothermal synergistic impact on biomass-reformed hydrogen generation. |
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| Keywords: | Hydrogen production Photothermal Colloidal dispersion stability |
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