Ultrafast and Efficient Transport of Hot Plasmonic Electrons by Graphene for Pt Free, Highly Efficient Visible-Light Responsive Photocatalyst

Dinesh Kumar, Ahreum Lee, Taegon Lee, Manho Lim, Dong-Kwon Lim

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

We report that reduced graphene-coated gold nanoparticles (r-GO-AuNPs) are excellent visible-light-responsive photocatalysts for the photoconversion of CO2 into formic acid (HCOOH). The wavelength-dependent quantum and chemical yields of HCOOH shows a significant contribution of plasmon-induced hot electrons for CO2 photoconversion. Furthermore, the presence and reduced state of the graphene layers are critical parameters for the efficient CO2 photoconversion because of the electron mobility of graphene. With an excellent selectivity toward HCOOH (>90%), the quantum yield of HCOOH using r-GO-AuNPs is 1.52%, superior to that of Pt-coated AuNPs (quantum yield: 1.14%). This indicates that r-GO is a viable alternative to platinum metal. The excellent colloidal stability and photocatalytic stability of r-GO-AuNPs enables CO2 photoconversion under more desirable reaction conditions. These results highlight the role of reduced graphene layers as highly efficient electron acceptors and transporters to facilitate the use of hot electrons for plasmonic photocatalysts. The femtosecond transient spectroscopic analysis also shows 8.7 times higher transport efficiency of hot plasmonic electrons in r-GO-AuNPs compared with AuNPs.

Original languageEnglish
Pages (from-to)1760-1767
Number of pages8
JournalNano Letters
Volume16
Issue number3
DOIs
Publication statusPublished - 2016 Mar 9

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Hot electrons
Photocatalysts
hot electrons
Graphene
graphene
formic acid
Quantum yield
Platinum metals
transporter
Spectroscopic analysis
Electron mobility
Formic acid
spectroscopic analysis
electron mobility
Gold
platinum
selectivity
gold
Nanoparticles

Keywords

  • CO photoconversion
  • hot electron
  • photochemical reaction
  • Plasmonic nanoparticles
  • visible light irradiation

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Ultrafast and Efficient Transport of Hot Plasmonic Electrons by Graphene for Pt Free, Highly Efficient Visible-Light Responsive Photocatalyst. / Kumar, Dinesh; Lee, Ahreum; Lee, Taegon; Lim, Manho; Lim, Dong-Kwon.

In: Nano Letters, Vol. 16, No. 3, 09.03.2016, p. 1760-1767.

Research output: Contribution to journalArticle

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