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Updated: Jan 20, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Published on: April 10, 2018

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

Lichen Bai¹, Chia-Shuo Hsu², Duncan T L Alexander^3,4

¹Laboratory 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.

Journal of the American Chemical Society

|August 17, 2019

Summary

Single-atom catalysts can be transformed into highly efficient double-atom catalysts for the oxygen evolution reaction (OER). This new Co-Fe catalyst shows excellent performance, demonstrating the potential of double-atom catalysis.

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Area of Science:

Materials Science
Catalysis
Electrochemistry

Background:

Single-atom catalysts offer high atomic efficiency but are limited in reactions needing bimetallic promotion, like alkaline oxygen evolution reaction (OER).
The oxygen evolution reaction (OER) is crucial for energy conversion but requires highly efficient and stable catalysts.

Purpose of the Study:

To develop a highly active and stable catalyst for the oxygen evolution reaction (OER) by transforming single-atom catalysts into double-atom catalysts.
To investigate the active site structure and catalytic mechanism of the novel double-atom catalyst.

Main Methods:

In situ transformation of a single-atom Cobalt (Co) precatalyst into a Cobalt-Iron (Co-Fe) double-atom catalyst.
Electrochemical measurements, including operando X-ray absorption spectroscopy (XAS), microscopy, and spectroscopy to characterize the catalyst and its performance.

Main Results:

The in situ transformed Co-Fe double-atom catalyst demonstrated one of the highest turnover frequencies for OER among metal oxides.
Operando XAS and other characterization techniques identified a dimeric Co-Fe moiety as the active site responsible for the enhanced catalytic activity.

Conclusions:

Double-atom catalysis is a promising strategy for designing highly efficient and well-defined catalysts for the oxygen evolution reaction (OER).
The developed Co-Fe double-atom catalyst represents a significant advancement in OER catalysis, offering a new avenue for energy conversion technologies.