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Title: Operando X‐Ray Absorption Spectroscopy Shows Iron Oxidation Is Concurrent with Oxygen Evolution in Cobalt–Iron (Oxy)hydroxide Electrocatalysts

Abstract

Abstract Iron cations are essential for the high activity of nickel and cobalt‐based (oxy)hydroxides for the oxygen evolution reaction, but the role of iron in the catalytic mechanism remains under active investigation. Operando X‐ray absorption spectroscopy and density functional theory calculations are used to demonstrate partial Fe oxidation and a shortening of the Fe−O bond length during oxygen evolution on Co(Fe)O x H y . Cobalt oxidation during oxygen evolution is only observed in the absence of iron. These results demonstrate a different mechanism for water oxidation in the presence and absence of iron and support the hypothesis that oxidized iron species are involved in water‐oxidation catalysis on Co(Fe)O x H y .

Authors:
 [1];  [1];  [2];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemistry &, Biochemistry and the Materials Science Institute University of Oregon Eugene OR 97403 USA
  2. Department of Materials Science &, Engineering and The Nancy &, Stephen Grand Technion Energy Program Technion—Israel Institute of Technology Haifa 3200003 Israel
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1468491
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Angewandte Chemie
Additional Journal Information:
Journal Name: Angewandte Chemie Journal Volume: 130 Journal Issue: 39; Journal ID: ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Enman, Lisa J., Stevens, Michaela Burke, Dahan, Meir Haim, Nellist, Michael R., Toroker, Maytal Caspary, and Boettcher, Shannon W.. Operando X‐Ray Absorption Spectroscopy Shows Iron Oxidation Is Concurrent with Oxygen Evolution in Cobalt–Iron (Oxy)hydroxide Electrocatalysts. Germany: N. p., 2018. Web. doi:10.1002/ange.201808818.
Enman, Lisa J., Stevens, Michaela Burke, Dahan, Meir Haim, Nellist, Michael R., Toroker, Maytal Caspary, & Boettcher, Shannon W.. Operando X‐Ray Absorption Spectroscopy Shows Iron Oxidation Is Concurrent with Oxygen Evolution in Cobalt–Iron (Oxy)hydroxide Electrocatalysts. Germany. https://doi.org/10.1002/ange.201808818
Enman, Lisa J., Stevens, Michaela Burke, Dahan, Meir Haim, Nellist, Michael R., Toroker, Maytal Caspary, and Boettcher, Shannon W.. Tue . "Operando X‐Ray Absorption Spectroscopy Shows Iron Oxidation Is Concurrent with Oxygen Evolution in Cobalt–Iron (Oxy)hydroxide Electrocatalysts". Germany. https://doi.org/10.1002/ange.201808818.
@article{osti_1468491,
title = {Operando X‐Ray Absorption Spectroscopy Shows Iron Oxidation Is Concurrent with Oxygen Evolution in Cobalt–Iron (Oxy)hydroxide Electrocatalysts},
author = {Enman, Lisa J. and Stevens, Michaela Burke and Dahan, Meir Haim and Nellist, Michael R. and Toroker, Maytal Caspary and Boettcher, Shannon W.},
abstractNote = {Abstract Iron cations are essential for the high activity of nickel and cobalt‐based (oxy)hydroxides for the oxygen evolution reaction, but the role of iron in the catalytic mechanism remains under active investigation. Operando X‐ray absorption spectroscopy and density functional theory calculations are used to demonstrate partial Fe oxidation and a shortening of the Fe−O bond length during oxygen evolution on Co(Fe)O x H y . Cobalt oxidation during oxygen evolution is only observed in the absence of iron. These results demonstrate a different mechanism for water oxidation in the presence and absence of iron and support the hypothesis that oxidized iron species are involved in water‐oxidation catalysis on Co(Fe)O x H y .},
doi = {10.1002/ange.201808818},
journal = {Angewandte Chemie},
number = 39,
volume = 130,
place = {Germany},
year = {Tue Sep 04 00:00:00 EDT 2018},
month = {Tue Sep 04 00:00:00 EDT 2018}
}

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