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Journal of Sol-Gel Science and Technology

, Volume 89, Issue 1, pp 255–263 | Cite as

CuO photoelectrodes synthesized by the sol–gel method for water splitting

  • J. Toupin
  • H. Strubb
  • S. Kressman
  • V. Artero
  • N. Krins
  • Ch. Laberty-RobertEmail author
Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
  • 216 Downloads

Abstract

CuO is an attractive photocatalytic material for water splitting due to its high earth abundance and low cost. In this paper, we report the deposition of CuO thin films by sol–gel dip-coating process. Sol deposition has attractive advantages including low-cost solution processing and uniform film formation over large areas with a fairly good control of the film stoichiometry and thickness. Pure CuO phase was obtained for calcination temperatures higher than 360 °C in air. The CuO photocurrents for hydrogen evolution depend on the crystallinity and the microstructure of the film. Values of −0.94 mA cm−2 at pH = 8 and 0 V vs. RHE were achieved for CuO photoelectrodes annealed at 400 °C under air. More interestingly, the stability of the photoelectrode was enhanced upon the sol–gel deposition of a TiO2 protective layer. In this all sol–gel CuO/TiO2 photocathode, a photocurrent of −0.5 mA cm−2 is achieved at pH = 7 and 0 V vs. RHE with a stability of ~100% over 600 s.

Highlights

  • Sol–gel-based CuO photoelectrode has values of −0.94 mA cm−2 at pH = 8 and 0 V vs. RHE.

  • CuO/TiO2 photoelectrodes have been synthesized by the sol–gel chemistry coupled with dip-coating.

  • These photoelectrodes exhibit −0.5 mA cm−2 at pH = 7 and 0 V vs. RHE.

  • These photoelectrodes are 100% stable over 600 s.

Keywords

CuO photoelectrode Sol–gel TiO2 protecting layer for CuO photoelectrode Water splitting 

Notes

Acknowledgements

This work was supported by the ANRT, the Agence Nationale de la Recherche through the LabEx ARCANE programme (ANR-11-LABX-0003-01), and Total-Energie Nouvelle.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10971_2018_4896_MOESM1_ESM.pdf (664 kb)
Supplementary Information

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de ParisSorbonne UniversitésParisFrance
  2. 2.Total Energies NouvellesPuteauxFrance
  3. 3.Laboratoire de Chimie et Biologie des MétauxUniversité Grenoble Alpes, CNRS, CEAGrenoble Cedex 9France

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