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High-performance iron (III) oxide electrocatalyst for water oxidation in strongly acidic media
Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2018 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 365, p. 29-35Article in journal (Refereed) Published
Abstract [en]

Stable and efficient oxygen evolution reaction (OER) catalysts for the oxidation of water to dioxygen in highly acidic media are currently limited to expensive noble metal (Ir and Ru) oxides since presently known OER catalysts made of inexpensive earth-abundant materials generally suffer anodic corrosion at low pH. In this study, we report that a mixed-polymorph film comprising maghemite and hematite, prepared using spray pyrolysis deposition followed by low-temperature annealing, showed a sustained OER rate (>24 h) corresponding to a current density of 10 mA cm−2 at an initial overpotential of 650 mV, with a Tafel slope of only 56 mV dec−1 and near-100% Faradaic efficiency in 0.5 M H2SO4 (pH 0.3). This performance is remarkable, since iron (III) oxide films comprising only maghemite were found to exhibit a comparable intrinsic activity, but considerably lower stability for OER, while films of pure hematite were OER-inactive. These results are explained by the differences in the polymorph crystal structures, which cause different electrical conductivity and surface interactions with water molecules and protons. Our findings not only reveal the potential of iron (III) oxide as acid-stable OER catalyst, but also highlight the important yet hitherto largely unexplored effect of crystal polymorphism on electrocatalytic OER performance.

Place, publisher, year, edition, pages
Academic Press, 2018. Vol. 365, p. 29-35
Keywords [en]
Artificial photosynthesis, Water oxidation, Oxygen evolution reaction, Acidic electrolyte, Iron oxide
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-150224DOI: 10.1016/j.jcat.2018.06.018ISI: 000442976400005OAI: oai:DiVA.org:umu-150224DiVA, id: diva2:1233696
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2018-07-19 Created: 2018-07-19 Last updated: 2018-09-21Bibliographically approved

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Lee, Cheng ChooShchukarev, AndreyBjörn, ErikMessinger, Johannes

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Lee, Cheng ChooShchukarev, AndreyBjörn, ErikMessinger, Johannes
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Department of Plant PhysiologyDepartment of Chemistry
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