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Identifying the active photocatalytic H2-production sites on TiO2-supported Pt nanoparticles by the in-situ infrared spectrum of CO |
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| Authors: | Zhou Peng Zhang Hongna Ji Hongwei Ma Wanhong Chen Chuncheng Zhao Jincai |
| Affiliation: | 1.Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China ;2.University of Chinese Academy of Sciences, Beijing, 100049, China ; |
| Abstract: | Identifying the active catalytic centers on catalyst surface is significant for exploring the catalytic reaction mechanism and further guiding the synthesis of high-performance catalysts.However,it remains a challange in developing the site-specific technology for the identification of the active catalytic centers.Herein,in-situ infrared spectroscopy of adsorbed CO,photocatalytic hydrogen evolution reaction(HER) test and theoretical simulation were used to distinguish and quantify the different surface sites and their H2-production catalytic activity on TiO_2-supported Pt nanoparticles(Pt NPs).Two different types of surface Pt sites,tip Pt(Pt_(tip)) and edge/terrace Pt_(edge/terrace),on TiO_2-supported Pt nanoparticles(Pt NPs) were identified.The photocatalytic H2-production activity of TiO_2-supported Pt NPs shows a linear functional relationship with the number of Pt_(tip) sites.However,the number of Pt_(edge/terracesites) produced little effect on the activity of TiO_2-supported Pt NPs.First-principle simulations confirmed that H2-evolution at the Pttipsites owns a lower energy barrier than that at Pt_(edge/terrace).This findings would be helpful for the fabrication of high-performance Pt catalysts. |
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