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A Cobalt-Iron Double-Atom Catalyst for the Oxygen Evolution Reaction

preprint
submitted on 15.05.2019 and posted on 16.05.2019 by Lichen Bai, Chia-Shuo Hsu, Duncan Alexander, Hao Ming Chen, Xile Hu
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 alkaline medium. Here we show that a single atom Co precatalyst can be in-situ transformed into a Co-Fe double atom catalyst for 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 developed of defined and highly active OER catalysts.

Funding

the European Research Council (no.681292)

the Ministry of Science and Technology, Taiwan (Contracts No. MOST 106-2119-M-002-031)

History

Email Address of Submitting Author

xile.hu@epfl.ch

Institution

Ecole Polytechnique Fédérale de Lausanne (EPFL)

Country

Switzerland

ORCID For Submitting Author

0000-0001-8335-1196

Declaration of Conflict of Interest

No

Version Notes

First version

Licence

Exports