Template-free nanostructured fluorine-doped tin oxide scaffolds for photoelectrochemical water splitting

Ivan Garcia-Torregrosa, Jochem H.J. Wijten, Silvia Zanoni, Freddy Oropeza Palacio, Jan Philipp Hofmann, Emiel Hensen, Bert M. Weckhuysen (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)
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Abstract

The synthesis and characterization of highly stable and conductive F:SnO 2 (FTO) nanopyramid arrays are investigated, and their use as scaffolds for water splitting is demonstrated. Current densities during the oxygen evolution reaction with a NiFeO x catalyst at 2 V vs reversible hydrogen electrode were increased 5-fold when substituting commercial FTO (TEC 15) by nanostructured FTO scaffolds. In addition, thin α-Fe 2O 3 films (∼50 nm thick) were employed as a proof of concept to show the effect of our nanostructured scaffolds during photoelectrochemical water splitting. Double-layer capacitance measurements showed a drastic increase of the relative electrochemically active surface area for the nanostructured samples, in agreement with the observed photocurrent enhancement, whereas UV-vis spectroscopy indicates full absorption of visible light at wavelengths below 600 nm.

Original languageEnglish
Pages (from-to)36485-36496
Number of pages12
JournalACS Applied Materials & Interfaces
Volume11
Issue number40
DOIs
Publication statusPublished - 9 Oct 2019

Keywords

  • nanostructuring
  • photoelectrode
  • spectroscopy
  • spray pyrolysis
  • water splitting

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