Journal of Solid State Electrochemistry

, Volume 22, Issue 5, pp 1539–1548 | Cite as

The iron oxyhydroxide role in the mediation of charge transfer for water splitting using bismuth vanadate photoanodes

  • Moisés A. de Araújo
  • Dyovani Coelho
  • Lucia H. Mascaro
  • Ernesto C. Pereira
Original Paper
  • 103 Downloads

Abstract

The water photo-oxidation to oxygen on iron oxyhydroxide (FeOOH) deposited on a surface of semiconductor materials play a crucial role in the enhancement of different devices. In order to investigate how FeOOH works to produce O2 from water splitting, we have investigated the role of a deposited layer of FeOOH on the bismuth vanadate (BiVO4) films. The simple-modified method based on polyethylene glycol was applied to produce BiVO4 nanostructures and a FeOOH photoelectrodeposition methodology was used to cover the BiVO4 film surface. The photoelectrochemistry study for FeOOH modified BiVO4 revealed a 3.4 times increase in the photocurrent at 1.23 V vs. RHE. A possible explanation to the FeOOH mechanism is that it is actually a green rust containing a mixture of Fe (II) and Fe (III) that acts as center of charge transfer mediation and not as a catalyst itself. This hypothesis has been supported by a change absence in the onset potential, no photocurrent saturation, and no change in the charge carrier density. Moreover, the FeOOH also passivated the surface states of BiVO4 as the open circuit potential shifted 70 mV vs. RHE to more positive potentials.

Graphical abstract

Keywords

Bismuth vanadate Iron oxyhydroxide Water splitting Hydrogen Energy Photoelectrochemical cell 

Notes

Acknowledgements

This work was supported by São Paulo Research Foundation (CEPID/FAPESP process 2013/07296-2, grant 2016/12681-0), the National Council of Technological and Scientific Development (CNPq, grants for M.A. de Araújo and D. Coelho), and the Coordination for the Improvement of Higher Education Personnel (CAPES, grant PNPD for D. Coelho).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Moisés A. de Araújo
    • 1
  • Dyovani Coelho
    • 1
  • Lucia H. Mascaro
    • 1
  • Ernesto C. Pereira
    • 1
  1. 1.Department of ChemistryFederal University of São CarlosSão CarlosBrazil

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