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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Hybrid FeNiOOH/α-Fe2O3/Graphene Photoelectrodes with Advanced Water Oxidation Performance

Author

  • Attila Kormányos
  • Egon Kecsenovity
  • Alireza Honarfar
  • Tönu Pullerits
  • Csaba Janáky

Summary, in English

In this study, the photoelectrochemical behavior of electrodeposited FeNiOOH/Fe2O3/graphene nanohybrid electrodes is investigated, which has precisely controlled structure and composition. The photoelectrode assembly is designed in a bioinspired manner where each component has its own function: Fe2O3 is responsible for the absorption of light, the graphene framework for proper charge carrier transport, while the FeNiOOH overlayer for facile water oxidation. The effect of each component on the photoelectrochemical behavior is studied by linear sweep photovoltammetry, incident photon-to-charge carrier conversion efficiency measurements, and long-term photoelectrolysis. 2.6 times higher photocurrents are obtained for the best-performing FeNiOOH/Fe2O3/graphene system compared to its pristine Fe2O3 counterpart. Transient absorption spectroscopy measurements reveal an increased hole-lifetime in the case of the Fe2O3/graphene samples. Long-term photoelectrolysis measurements in combination with Raman spectroscopy, however, prove that the underlying nanocarbon framework is corroded by the photogenerated holes. This issue is tackled by the electrodeposition of a thin FeNiOOH overlayer, which rapidly accepts the photogenerated holes from Fe2O3, thus eliminating the pathway leading to the corrosion of graphene.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2020-08-03

Language

English

Publication/Series

Advanced Functional Materials

Volume

30

Issue

31

Document type

Journal article

Publisher

Wiley-VCH Verlag

Topic

  • Materials Chemistry
  • Condensed Matter Physics

Keywords

  • composite materials
  • interface engineering
  • photoelectrochemistry
  • solar fuels
  • transient absorption spectroscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 1616-301X