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Synergistic Effect of Graphene as Electron-Transfer Mediator and Ni (Ⅱ) as Interfacial Catalytic Active Site for Enhanced H2-Production Performance of TiO2 |
Author Name | Affiliation | E-mail | ZHANG Chao-Ying | School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China | | WANG Ping | School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China | wangping0904@whut.edu.cn | LIU Yan-Yan | School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China | | HU Ling-Na | School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China | |
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Abstract: Highly efficient TiO2 photocatalysts co-modified by reduced graphene oxide (rGO) as electron-transfer mediator and Ni (Ⅱ) as interfacial catalytic active-sites (referred to as Ni (Ⅱ)/TiO2-rGO) were synthesized via a two-step process including the initial hydrothermal method of rGO on the TiO2 surface and the following low-temperature impregnation method of Ni (Ⅱ) on the rGO.Photocatalytic experimental results indicated that all resulted Ni (Ⅱ)/TiO2- rGO photocatalysts exhibited obviously high H2-production performance.The highest H2-production rate of the resultant Ni (Ⅱ)/TiO2-rGO (0.1 mol·L-1) reached 77.0 μmol·h-1,while this value was higher than that of the TiO2(16.4 μmol·h-1) and TiO2-rGO (28.0 μmol·h-1) by a factor of 4.70 and 2.75,respectively.On the basis of the experimental results,a synergistic effect mechanism of rGO and Ni (Ⅱ) bi-cocatalysts was proposed to account for its enhanced H2-production performance,namely,rGO functions as an electron-transfer mediator to rapidly capture and transfer the photogenerated electron from TiO2 surface,while the Ni (Ⅱ) cocatalyst serves as an effectively active site for the following reduction. |
Keywords: TiO2 synergistic effect reduced graphene oxide (rGO) electron-transfer mediator Ni(Ⅱ) interfacial catalytic active-site |
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ZHANG Chao-Ying,WANG Ping,LIU Yan-Yan,HU Ling-Na.Synergistic Effect of Graphene as Electron-Transfer Mediator and Ni (Ⅱ) as Interfacial Catalytic Active Site for Enhanced H2-Production Performance of TiO2[J].Chinese Journal of Inorganic Chemistry,2017,33(7):1132-1138. |
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