Mechanistic Insights into Photocatalyzed Hydrogen Desorption from Palladium Surfaces Assisted by Localized Surface Plasmon Resonances

Vincent A. Spata, Emily A. Carter

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Nanoparticles synthesized from plasmonic metals can absorb low-energy light, producing an oscillation/excitation of their valence electron density that can be utilized in chemical conversions. For example, heterogeneous photocatalysis can be achieved within heterometallic antenna-reactor complexes (HMARCs), by coupling a reactive center at which a chemical reaction occurs to a plasmonic nanoparticle that acts as a light-absorbing antenna. For example, HMARCs composed of aluminum antennae and palladium (Pd) reactive centers have been demonstrated recently to catalyze selective hydrogenation of acetylene to ethylene. Here, we explore within a theoretical framework the rate-limiting step of hydrogen photodesorption from a Pd surface - crucial to achieving partial rather than full hydrogenation of acetylene - to understand the mechanism behind the photodesorption process within the HMARC assembly. To properly describe electronic excited states of the metal-molecule system, we employ embedded complete active space self-consistent field and n-electron valence state perturbation theory to second order within density functional embedding theory. The results of these calculations reveal that the photodesorption mechanism does not create a frequently invoked transient negative ion species but instead enhances population of available excited-state, low-barrier pathways that exhibit negligible charge-transfer character.

Original languageEnglish (US)
Pages (from-to)3512-3522
Number of pages11
JournalACS Nano
Volume12
Issue number4
DOIs
StatePublished - Apr 24 2018

All Science Journal Classification (ASJC) codes

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

Keywords

  • acetylene hydrogenation
  • composite nanostructures
  • heterogeneous catalysis
  • heterometallic antenna-reactor complex
  • hydrogen dissociation
  • localized surface plasmon resonance
  • transition metal catalysts

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