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

Xin Sun; Devendra Tiwari; David J. Fermin

doi:10.1149/2.0141915jes

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 journal › Article › peer-review

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Abstract

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.

Original language	English
Pages (from-to)	H764-H768
Number of pages	6
Journal	Journal of the Electrochemical Society
Volume	166
Issue number	15
DOIs	https://doi.org/10.1149/2.0141915jes
Publication status	Published - 18 Oct 2019
Externally published	Yes

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Sun_2019_J._Electrochem._Soc._166_H764Final published version, 0.99 MBLicence: CC BY

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

abstract = "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. ",

author = "Xin Sun and Devendra Tiwari and Fermin, {David J.}",

note = "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.",

year = "2019",

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doi = "10.1149/2.0141915jes",

language = "English",

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journal = "Journal of the Electrochemical Society",

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AU - Sun, Xin

AU - Tiwari, Devendra

AU - Fermin, David J.

N1 - 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.

PY - 2019/10/18

Y1 - 2019/10/18

N2 - 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.

AB - 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.

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DO - 10.1149/2.0141915jes

M3 - Article

SN - 0013-4651

VL - 166

SP - H764-H768

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 15

ER -

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

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