Enhanced stability and activity for water oxidation in alkaline media with Bismuth Vanadate photoelectrodes modified with a cobalt oxide catalytic layer produced by atomic layer deposition

Michael F. Lichterman, Matthew R. Shaner, Sheila G. Handler, Bruce S. Brunschwig, Harry B. Gray, Nathan S Lewis, Joshua M. Spurgeon

Research output: Contribution to journalArticle

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Abstract

Atomic-layer deposition (ALD) of thin layers of cobalt oxide on n-type BiVO4 produced photoanodes capable of water oxidation with essentially 100% faradaic efficiency in alkaline, pH = 13 electrolytes. By contrast, under the same operating conditions, BiVO4 photoanodes without the Co oxide catalytic layer exhibited lower faradaic yields, of ca. 70%, for O2 evolution and were unstable, becoming rapidly photopassivated. High numbers (>25) of ALD cycles of Co oxide deposition gave electrodes that displayed poor photoelectrochemical behavior, but 15-20 ALD cycles produced Co oxide overlayers ∼1 nm in thickness, with the resulting photoelectrodes exhibiting a stable photocurrent density of 1.49 mA cm -2 at the oxygen-evolution potential and an open-circuit potential of 0.404 V versus the reversible hydrogen electrode, under 100 mW cm-2 of simulated air mass 1.5 illumination.

Original languageEnglish
Pages (from-to)4188-4191
Number of pages4
JournalJournal of Physical Chemistry Letters
Volume4
Issue number23
DOIs
Publication statusPublished - Dec 5 2013

Fingerprint

cobalt oxides
vanadates
Atomic layer deposition
atomic layer epitaxy
Bismuth
Oxides
bismuth
Cobalt
Oxidation
oxidation
oxides
Water
water
cycles
Electrodes
electrodes
air masses
Photocurrents
Electrolytes
photocurrents

Keywords

  • catalysis
  • interfaces
  • surfaces

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Enhanced stability and activity for water oxidation in alkaline media with Bismuth Vanadate photoelectrodes modified with a cobalt oxide catalytic layer produced by atomic layer deposition. / Lichterman, Michael F.; Shaner, Matthew R.; Handler, Sheila G.; Brunschwig, Bruce S.; Gray, Harry B.; Lewis, Nathan S; Spurgeon, Joshua M.

In: Journal of Physical Chemistry Letters, Vol. 4, No. 23, 05.12.2013, p. 4188-4191.

Research output: Contribution to journalArticle

Lichterman, Michael F. ; Shaner, Matthew R. ; Handler, Sheila G. ; Brunschwig, Bruce S. ; Gray, Harry B. ; Lewis, Nathan S ; Spurgeon, Joshua M. / Enhanced stability and activity for water oxidation in alkaline media with Bismuth Vanadate photoelectrodes modified with a cobalt oxide catalytic layer produced by atomic layer deposition. In: Journal of Physical Chemistry Letters. 2013 ; Vol. 4, No. 23. pp. 4188-4191.
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