YFeO3 Photocathodes for Hydrogen Evolution

María Isabel Díez-García, Verónica Celorrio, Laura Calvillo, Devendra Tiwari, Roberto Gómez, David J. Fermín*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)
296 Downloads (Pure)

Abstract

The behavior of YFeO3 thin-film electrodes under illumination is investigated for the first time. YFeO3 thin films on F-doped SnO2 (FTO) electrodes were prepared by two different methods (A) deposition of nanoparticles synthesized by the so-called ionic liquid route at 1000° C followed by sintering at 400° C and (B) spin coating of a sol-gel precursor followed by a heat treatment at 640° C. Method A provides highly texture films with exquisite orthorhombic phase purity and a direct band gap transition at 2.45 eV. On the other hand, method B results in very compact and amorphous films. XPS confirmed a Fe3+ oxidation state in both films, with a surface composition ratio of 70:30 Y:Fe. Both materials exhibit cathodic photocurrent responses arising from hydrogen evolution in alkaline solutions with an onset potential of 1.05 V vs. RHE. The complex behavior of the photoresponses is rationalized in terms of recombination losses, band edge energy tails and hindered transport across the oxide thin film.

Original languageEnglish
Pages (from-to)365-371
Number of pages7
JournalElectrochimica Acta
Volume246
Early online date9 Jun 2017
DOIs
Publication statusPublished - 20 Aug 2017

Keywords

  • YFeO3
  • perovskite
  • Nanoparticles
  • photocurrent
  • Band tails

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