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Cited by 3,588

The DOI matches its Crossref record; 5 of the 5 references it cites were found in a registry or an index.

Nickel–Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation

Open access
Trotochaud, Lena, Young, Samantha L., Ranney, James K., Boettcher, Shannon W.·2014·Journal of the American Chemical Society

Abstract

Fe plays a critical, but not yet understood, role in enhancing the activity of the Ni-based oxygen evolution reaction (OER) electrocatalysts. We report electrochemical, in situ electrical, photoelectron spectroscopy, and X-ray diffraction measurements on Ni(1-x)Fe(x)(OH)2/Ni(1-x)Fe(x)OOH thin films to investigate the changes in electronic properties, OER activity, and structure as a result of Fe inclusion. We developed a simple method for purification of KOH electrolyte that uses precipitated bulk Ni(OH)2 to absorb Fe impurities. Cyclic voltammetry on rigorously Fe-free Ni(OH)2/NiOOH reveals new Ni redox features and no significant OER current until >400 mV overpotential, different from previous reports which were likely affected by Fe impurities. We show through controlled crystallization that β-NiOOH is less active for OER than the disordered γ-NiOOH starting material and that previous reports of increased activity for β-NiOOH are due to incorporation of Fe-impurities during the crystallization process. Through-film in situ conductivity measurements show a >30-fold increase in film conductivity with Fe addition, but this change in conductivity is not sufficient to explain the observed changes in activity. Measurements of activity as a function of film thickness on Au and glassy carbon substrates are consistent with the hypothesis that Fe exerts a partial-charge-transfer activation effect on Ni, similar to that observed for noble-metal electrode surfaces. These results have significant implications for the design and study of Ni(1-x)Fe(x)OOH OER electrocatalysts, which are the fastest measured OER catalysts under basic conditions.

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Metadata

Authors
Trotochaud, L., Young, S. L., Ranney, J. K., & Boettcher, S. W.
Venue
Journal of the American Chemical Society
Published
2014-04-29
Volume
136
Issue
18
Pages
6744-6753
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2312725582
Cited by
3,588
References
5
FWCI
68.00
Type
journal article
Language
en
Open access
green

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