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Cited by 1,548

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Solution-Cast Metal Oxide Thin Film Electrocatalysts for Oxygen Evolution

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Trotochaud, Lena, Ranney, James K., Williams, Kerisha N., Boettcher, Shannon W.·2012·Journal of the American Chemical Society
DOI 10.1021/ja307507a
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Abstract

Water oxidation is a critical step in water splitting to make hydrogen fuel. We report the solution synthesis, structural/compositional characterization, and oxygen evolution reaction (OER) electrocatalytic properties of ~2-3 nm thick films of NiO(x), CoO(x), Ni(y)Co(1-y)O(x), Ni(0.9)Fe(0.1)O(x), IrO(x), MnO(x), and FeO(x). The thin-film geometry enables the use of quartz crystal microgravimetry, voltammetry, and steady-state Tafel measurements to study the electrocatalytic activity and electrochemical properties of the oxides. Ni(0.9)Fe(0.1)O(x) was found to be the most active water oxidation catalyst in basic media, passing 10 mA cm(-2) at an overpotential of 336 mV with a Tafel slope of 30 mV dec(-1) with oxygen evolution reaction (OER) activity roughly an order of magnitude higher than IrO(x) control films and similar to the best known OER catalysts in basic media. The high activity is attributed to the in situ formation of layered Ni(0.9)Fe(0.1)OOH oxyhydroxide species with nearly every Ni atom electrochemically active. In contrast to previous reports that showed synergy between Co and Ni oxides for OER catalysis, Ni(y)Co(1-y)O(x) thin films showed decreasing activity relative to the pure NiO(x) films with increasing Co content. This finding is explained by the suppressed in situ formation of the active layered oxyhydroxide with increasing Co. The high OER activity and simple synthesis make these Ni-based catalyst thin films useful for incorporating with semiconductor photoelectrodes for direct solar-driven water splitting or in high-surface-area electrodes for water electrolysis.

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Citations

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Metadata

Authors
Trotochaud, L., Ranney, J. K., Williams, K. N., & Boettcher, S. W.
Venue
Journal of the American Chemical Society
Publisher
American Chemical Society (ACS)
Published
2012-10-05
Volume
134
Issue
41
Pages
17253-17261
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
DOI
10.1021/ja307507a
OpenAlex
W2011685920
Cited by
1,548
References
5
FWCI
32.68
Type
journal article
Language
en
Open access
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