Charge-Transfer Dynamics in Nanorod Photocatalysts with Bimetallic Metal Tips

Maria Wächtler, Philip Kalisman, Lilac Amirav

Research output: Contribution to journalArticlepeer-review

Abstract

CdSe@CdS dot-in-rod nanostructures tipped with AuPt bimetallic nanoparticles as cocatalyst show increased photon-to-hydrogen conversion efficiency compared to their analogues with pure Au or Pt tips. The underlying charge-separation and recombination processes are investigated by time-resolved transient absorption spectroscopy, to unravel whether the observed enhancement of photocatalytic activity is due to charge-separation/recombination properties of the system or to higher reactivity for proton reduction at the surface of the metal nanoparticle. We find that in the catalytically active Pt- and AuPt-functionalized structures charge separation occurs with similar time constants (Pt 3.5, 35, and 49 ps; AuPt 2.6, 31, and 66 ps), and the charge-separated state shows a lifetime of ∼20 μs in both cases. Hence, these processes should not be regarded as a source of the increased catalytic efficiency in the AuPt-functionalized nanorods. The results indicate that the proton reduction at the metal nanoparticle surface itself determines the overall efficiency.

Original languageEnglish
Pages (from-to)24491-24497
Number of pages7
JournalJournal of Physical chemistry c
Volume120
Issue number42
DOIs
StatePublished - 27 Oct 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

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