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Title: Electrocatalytic Water Oxidation by Single Site and Small Nuclearity Clusters of Cobalt

Abstract

Here, cobalt oxides are an earth abundant material that exhibits high electrocatalytic activity for the oxygen evolution reaction (OER) across a wide pH range. Recent studies suggest that OER catalysis can proceed through an active site comprised of one or two cobalt atoms but that multiple adjacent cobalt centers are preferred to stabilize high valent cobalt oxo-intermediates by delocalization. Utilizing molecular precursors to prepare single, isolated cobalt atoms (SS-Co) and small clusters of Co 3O 4 we find that OER proceeds more efficiently on Co 3O 4. Using electrochemical impedance spectroscopy (EIS), these results were rationalized at an atomic level. The EIS results support a hypothesis that charge transfer related to the formation of reaction intermediates proceeds more easily on Co 3O 4 than on SS-Co, which is attributed to the difficulty in forming Co(IV) = O and unlikely nucleophilic attack by water to form Co(II)-OOH.

Authors:
ORCiD logo [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Yale Univ., New Haven, CT (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1466714
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 4; Related Information: © The Author(s) 2017.; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Electrocatalysis; Electrochemical Impedance Spectroscopy; Oxygen Evolution Reaction

Citation Formats

Swierk, John R., and Tilley, T. Don. Electrocatalytic Water Oxidation by Single Site and Small Nuclearity Clusters of Cobalt. United States: N. p., 2017. Web. doi:10.1149/2.0041804jes.
Swierk, John R., & Tilley, T. Don. Electrocatalytic Water Oxidation by Single Site and Small Nuclearity Clusters of Cobalt. United States. doi:10.1149/2.0041804jes.
Swierk, John R., and Tilley, T. Don. Thu . "Electrocatalytic Water Oxidation by Single Site and Small Nuclearity Clusters of Cobalt". United States. doi:10.1149/2.0041804jes. https://www.osti.gov/servlets/purl/1466714.
@article{osti_1466714,
title = {Electrocatalytic Water Oxidation by Single Site and Small Nuclearity Clusters of Cobalt},
author = {Swierk, John R. and Tilley, T. Don},
abstractNote = {Here, cobalt oxides are an earth abundant material that exhibits high electrocatalytic activity for the oxygen evolution reaction (OER) across a wide pH range. Recent studies suggest that OER catalysis can proceed through an active site comprised of one or two cobalt atoms but that multiple adjacent cobalt centers are preferred to stabilize high valent cobalt oxo-intermediates by delocalization. Utilizing molecular precursors to prepare single, isolated cobalt atoms (SS-Co) and small clusters of Co3O4 we find that OER proceeds more efficiently on Co3O4. Using electrochemical impedance spectroscopy (EIS), these results were rationalized at an atomic level. The EIS results support a hypothesis that charge transfer related to the formation of reaction intermediates proceeds more easily on Co3O4 than on SS-Co, which is attributed to the difficulty in forming Co(IV) = O and unlikely nucleophilic attack by water to form Co(II)-OOH.},
doi = {10.1149/2.0041804jes},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 165,
place = {United States},
year = {2017},
month = {11}
}

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