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    A Cobalt–Iron Double-Atom Catalyst for the Oxygen Evolution Reaction
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    • Lichen Bai
      Lichen Bai
      Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-ISIC-LSCI, BCH 3305, CH 1015 Lausanne, Switzerland
      More by Lichen Bai
    • Chia-Shuo Hsu
      Chia-Shuo Hsu
      Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
      More by Chia-Shuo Hsu
      Orcidhttp://orcid.org/0000-0002-7767-8413
    • Duncan T. L. Alexander
      Duncan T. L. Alexander
      Interdisciplinary Centre for Electron Microscopy (CIME), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
      Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
      More by Duncan T. L. Alexander
      Orcidhttp://orcid.org/0000-0003-4350-8587
    • Hao Ming Chen*
      Hao Ming Chen
      Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
      *[email protected]
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      Orcidhttp://orcid.org/0000-0002-7480-9940
    • Xile Hu*
      Xile Hu
      Laboratory of Inorganic Synthesis and Catalysis, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-ISIC-LSCI, BCH 3305, CH 1015 Lausanne, Switzerland
      *[email protected]
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      Orcidhttp://orcid.org/0000-0001-8335-1196
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    Journal of the American Chemical Society

    Cite this: J. Am. Chem. Soc. 2019, 141, 36, 14190–14199
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    https://doi.org/10.1021/jacs.9b05268
    Published August 16, 2019
    Copyright © 2019 American Chemical Society
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    Abstract

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    Single-atom catalysts exhibit well-defined active sites and potentially maximum atomic efficiency. However, they are unsuitable for reactions that benefit from bimetallic promotion such as the oxygen evolution reaction (OER) in an alkaline medium. Here we show that a single-atom Co precatalyst can be in situ transformed into a Co–Fe double-atom catalyst for the OER. This catalyst exhibits one of the highest turnover frequencies among metal oxides. Electrochemical, microscopic, and spectroscopic data, including those from operando X-ray absorption spectroscopy, reveal a dimeric Co–Fe moiety as the active site of the catalyst. This work demonstrates double-atom catalysis as a promising approach for the development of defined and highly active OER catalysts.

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    Cite this: J. Am. Chem. Soc. 2019, 141, 36, 14190–14199
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