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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 NameAffiliationE-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  
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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Chinese Journal of Inorganic Chemistry