Al@TiO2Core-Shell Nanoparticles for Plasmonic Photocatalysis

Aaron Bayles, Shu Tian, Jingyi Zhou, Lin Yuan, Yigao Yuan, Christian R. Jacobson, Corbin Farr, Ming Zhang, Dayne F. Swearer, David Solti, Minghe Lou, Henry O. Everitt, Peter Nordlander, Naomi J. Halas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Plasmon-induced photocatalysis is a topic of rapidly increasing interest, due to its potential for substantially lowering reaction barriers and temperatures and for increasing the selectivity of chemical reactions. Of particular interest for plasmonic photocatalysis are antenna-reactor nanoparticles and nanostructures, which combine the strong light-coupling of plasmonic nanostructures with reactors that enhance chemical specificity. Here, we introduce Al@TiO2 core-shell nanoparticles, combining earth-abundant Al nanocrystalline cores with TiO2 layers of tunable thickness. We show that these nanoparticles are active photocatalysts for the hot electron-mediated H2 dissociation reaction as well as for hot hole-mediated methanol dehydration. The wavelength dependence of the reaction rates suggests that the photocatalytic mechanism is plasmonic hot carrier generation with subsequent transfer of the hot carriers into the TiO2 layer. The Al@TiO2 antenna-reactor provides an earth-abundant solution for the future design of visible-light-driven plasmonic photocatalysts.

Original languageEnglish (US)
Pages (from-to)5839-5850
Number of pages12
JournalACS nano
Volume16
Issue number4
DOIs
StatePublished - Apr 26 2022
Externally publishedYes

Keywords

  • Aluminum
  • core-shell
  • nanocrystals
  • photocatalysis
  • plasmonics
  • titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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