Nanostructured LaFeO3 Photocathodes with Onset Potentials for the Hydrogen Evolution Reaction Over 1.4 V vs RHE

Xin Sun, Devendra Tiwari, David J Fermin

Research output: Contribution to journalArticle (Academic Journal)

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Abstract

The photoelectrochemical properties of phase-pure LaFeO3 (LFO) nanostructured films are investigated upon modification with a thin TiO2 film and Pt nanoparticles as a catalyst. LaFeO3 with crystallite domains in the range of 60 nm are prepared by thermolysis of an ionic-liquid precursor and subsequently deposited onto FTO electrode by spin-coating. Deposition of a TiO2 layer by solution-based methods leads to the formation of a heterojunction, attenuating dark current associated with hole-transfer (water oxidation) at potential above 1.4 V. The LFO/TiO2 heterojunction features photocurrent onset potential for the hydrogen evolution reaction of 1.47 V vs the reversible hydrogen electrode (RHE), which is one of the most positive values reported for a single absorber. Deposition of Pt nanoparticles at the LFO/TiO2 heterostructure generates a significant increase in the HER photocurrent, although bulk recombination remains an important challenge in these constructs.
Original languageEnglish
Pages (from-to)H764-H768
Number of pages5
JournalJournal of the Electrochemical Society
Volume166
Issue number15
DOIs
Publication statusPublished - 18 Oct 2019

Keywords

  • films
  • photoelectrochemistry
  • hydrogen evolution reaction
  • LaFeO3

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