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

16 May 2019, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

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.

Keywords

Oxygen evolution
single-atom catalyst
Co
nitrogen-doped carbon
single-site catalyst
double-atom catalyst

Supplementary materials

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Title
CoFe double atom-SI-preprint-Hu3
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