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

Sun, Xin, Tiwari, Devendra and Fermin, David J. (2019) Nanostructured LaFeO3 Photocathodes with Onset Potentials for the Hydrogen Evolution Reaction Over 1.4 V vs. RHE. Journal of the Electrochemical Society, 166 (15). H764-H768. ISSN 0013-4651

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The photoelectrochemical properties of phase-pure LaFeO 3 (LFO) nanostructured films are investigated upon modification with a thin TiO 2 film and Pt nanoparticles as a catalyst. LaFeO 3 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 TiO 2 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/TiO 2 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/TiO 2 heterostructure generates a significant increase in the HER photocurrent, although bulk recombination remains an important challenge in these constructs.

Item Type: Article
Uncontrolled Keywords: Funding Information: XS is indebted to the School of Chemistry of the University of Bristol for enabling sponsoring access to research facilities. DT is thankful to the Engineering and Physical Sciences Research Council for funding through the University of Bristol Impact Acceleration Account.
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 23 May 2022 15:10
Last Modified: 23 May 2022 15:15

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