Identifying the active photocatalytic H 2 -production sites on TiO 2 -supported Pt nanoparticles by the in-situ infrared spectrum of CO
Science China Chemistry(2020)
摘要
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, photo-catalytic 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 TiO2-supported Pt nanoparticles (PtNPs). Two different types of surface Pt sites, tip Pt (Pttip) and edge/terrace Ptedge/terrace, on TiO2-supported Pt nanoparticles (PtNPs) were identified. The photocatalytic H2-production activity of TiO2-supported PtNPs shows a linear functional relationship with the number of Pttip sites. However, the number of Ptedge/terrace sites produced little effect on the activity of TiO2-supported PtNPs. First-principle simulations confirmed that H2-evolution at the Pttip sites owns a lower energy barrier than that at Ptedge/terrace. This findings would be helpful for the fabrication of high-performance Pt catalysts.
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关键词
Pt nanocatalyst,H2 production,photocatalyst,active site,in-situ IR
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