Photoinduced electron transfer pathways in hydrogen-evolving reduced graphene oxide-boosted hybrid nano-bio catalyst

Peng Wang, Nada M. Dimitrijevic, Angela Y. Chang, Richard D. Schaller, Yuzi Liu, Tijana Rajh, Elena A. Rozhkova

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Photocatalytic production of clean hydrogen fuels using water and sunlight has attracted remarkable attention due to the increasing global energy demand. Natural and synthetic dyes can be utilized to sensitize semiconductors for solar energy transformation using visible light. In this study, reduced graphene oxide (rGO) and a membrane protein bacteriorhodopsin (bR) were employed as building modules to harness visible light by a Pt/TiO2 nanocatalyst. Introduction of the rGO boosts the nano-bio catalyst performance that results in hydrogen production rates of approximately 11.24 mmol of H2 (μmol protein)-1 h-1. Photoelectrochemical measurements show a 9-fold increase in photocurrent density when TiO2 electrodes were modified with rGO and bR. Electron paramagnetic resonance and transient absorption spectroscopy demonstrate an interfacial charge transfer from the photoexcited rGO to the semiconductor under visible light.

Original languageEnglish (US)
Pages (from-to)7995-8002
Number of pages8
JournalACS nano
Volume8
Issue number8
DOIs
StatePublished - Aug 26 2014
Externally publishedYes

Keywords

  • bacteriorhodopsin
  • graphene
  • hydrogen fuels
  • nano-bio materials
  • visible light

ASJC Scopus subject areas

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

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