Evaluation of the plasmonic effect of Au and Ag on Ti-based photocatalysts in 
the reduction of CO2 to CH4

Dilla, Martin; Pougin, Anna; Strunk, Jennifer

doi:10.1016/j.jechem.2016.09.009

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Evaluation of the plasmonic effect of Au and Ag on Ti-based photocatalysts in the reduction of CO₂ to CH₄

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Dilla, Martin
Research Group Nanobased Heterogeneous Catalysts, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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引用

Dilla, M., Pougin, A., & Strunk, J. (2017). Evaluation of the plasmonic effect of Au and Ag on Ti-based photocatalysts in the reduction of CO₂ to CH₄. Journal of Energy Chemistry, 26(2), 277-283. doi:10.1016/j.jechem.2016.09.009.

引用: https://hdl.handle.net/21.11116/0000-0006-E1EE-0

要旨

Crystalline TiO2 (P25) and isolated titanate species in a ZSM-5 structure (TS-1) were modified with Au and Ag, respectively, and tested in the gas-phase photocatalytic CO2 reduction under high purity conditions. The noble metal modification was performed by photodeposition. Light absorbance properties of the catalysts are examined with UV-Vis spectroscopy before and after the activity test. In the gas-phase photocatalytic CO2 reduction, it was observed that the catalysts with Ag nanostructures are more active than those with Au nanostructures. It is thus found that the energetic difference between the band gap energy of the semiconductor and the position of the plasmon is influencing the photocatalytic activity. Potentially, plasmon excitation due to visible light absorption results in plasmon resonance energy, which affects the excitation of the semiconductor positively. Therefore, an overlap between band gap energy of the semiconductor and metal plasmon is needed. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.