Faradaic efficiency of O2 evolution on metal nanoparticle sensitized hematite photoanodes

Beniamino Iandolo, Björn Wickman, Brian Seger, Ib Chorkendorff, Igor Zoric, Anders Hellman

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Functionalization of transition metal oxides using metallic nanoparticles is an interesting route towards efficient photoelectrochemical hydrogen production via water splitting. Although an enhanced photocurrent in photoanodes upon functionalization with metallic nanostructures has been observed in several studies, to the best of our knowledge no measurements of the Faradaic efficiency (FE) of the oxygen evolution reaction (OER) have been reported for such systems. This work characterizes the FE on a model system consisting of ultra-thin films of hematite (Fe2O3) sensitized with Ti/Au nanodisks. Compared to bare hematite references, sensitized samples showed significantly enhanced photocurrents as well as O-2 evolution. Experimental evidence suggests that the observed enhancement was not due to photocatalytic activity of the nanodisks. The FE has been determined to be 100%, within the experimental errors, for both sensitized and reference samples. Also, this work demonstrates that the sensitized samples were stable for at least 16 hours photocurrent testing. The concepts shown in this work are generally applicable to any situation in which a semiconductor has its water splitting performance enhanced by metallic nanostructures.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number3
Pages (from-to)1271-1275
ISSN1463-9076
DOIs
Publication statusPublished - 2014

Keywords

  • CHEMISTRY,
  • PHYSICS,
  • ATOMIC LAYER DEPOSITION
  • SEMICONDUCTOR ELECTRODES
  • WATER OXIDATION
  • IRON-OXIDE
  • HYDROGEN-PRODUCTION
  • SOLAR
  • PHOTOELECTRODES
  • ABSORPTION
  • CATALYST
  • FILMS

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