Confirming nonthermal plasmonic effects enhance CO2 methanation on Rh/TiO2 catalysts

Published

Journal Article

© 2019, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. In some cases, illumination of traditional thermal catalysts and tailored plasmonic photocatalysts may synergistically combine thermal and nonthermal mechanisms to enhance reaction rates and improve product selectivity at reduced temperatures. To understand how these attributes are achieved in plasmon-driven catalysis, these intertwined thermal and nonthermal effects must be untangled. Here, we show how a novel indirect illumination technique, in conjunction with precisely monitored thermal profiles of the catalyst, can confirm and clarify the role of nonthermal effects in plasmon-enhanced carbon dioxide methanation on a Rh/TiO2 photocatalyst. We find that the extracted nonthermal methane production rate has a linear dependence on the top surface temperature, distinctly different from an exponential dependence for thermal catalysis. We also find that the apparent quantum efficiency from the nonthermal contribution has no dependence on light intensity but maintains a linear dependence on top surface temperatures between 200 and 350 °C. The clear exposition of nonthermal effects in the Rh/TiO2 plasmonic photocatalyst illustrates how this methodology may be applied for the quantitative evaluation of thermal and nonthermal light effects in other plasmon-enhanced catalytic reactions.[Figure not available: see fulltext.].

Full Text

Duke Authors

Cited Authors

  • Li, X; Everitt, HO; Liu, J

Published Date

  • August 1, 2019

Published In

Volume / Issue

  • 12 / 8

Start / End Page

  • 1906 - 1911

Electronic International Standard Serial Number (EISSN)

  • 1998-0000

International Standard Serial Number (ISSN)

  • 1998-0124

Digital Object Identifier (DOI)

  • 10.1007/s12274-019-2457-x

Citation Source

  • Scopus