【摘 要】
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Spatial isolation of different functional sites at the nanoscale in multifunctional catalysts for steering reaction sequence and paths remains a major challenge.Herein,we reported the spatial separation of dual-site Au and RuO2 on the nanosurface of TiO2
【机 构】
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Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in
论文部分内容阅读
Spatial isolation of different functional sites at the nanoscale in multifunctional catalysts for steering reaction sequence and paths remains a major challenge.Herein,we reported the spatial separation of dual-site Au and RuO2 on the nanosurface of TiO2 (Au/TiO2/RuO2) through the strong metal-support interaction (SMSI) and the lattice matching (LM) for robust photocatalytic hydrogen evolution.The SMSI between Au and TiO2 induced the encapsulation ofAu nanoparticles by an impermeable TiOx overlayer,which can function as a physical separation barrier to the permeation of the second precursor.The LM between RuO2 and rutile-TiO2 can increase the stability of RuO2/TiO2 interface and thus prevent the aggregation of dual-site Au and RuO2 in the calcination process of removing TiOx overlayer of Au.The photocatalytic hydrogen production is used as a model reaction to evaluate the performance of spatially separated dual-site Au/TiO2/RuO2 catalysts.The rate of hydrogen production of the Au/TiO2/RuO2 is as high as 84 μmol h-1 g-1 under solar light irradiation without sacrificial agents,which is 2.5 times higher than the reference Au/TiO2 and non-separated Au/RuO2/TiO2 samples.Systematic characterizations verify that the spatially separated dual-site Au and RuO2 on the nanosurface of TiO2 can effectively separate the photo-generated carriers and lower the height of the Schottky barrier,respectively,under UV and visible light irradiation.This study provides new inspiration for the precise construction of different sites in multifunctional catalysts.
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