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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Updated: Dec 10, 2025

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

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

Published on: April 10, 2018

A Mn-N₃ single-atom catalyst embedded in graphitic carbon nitride for efficient CO₂ electroreduction.

Jiaqi Feng^1,2, Hongshuai Gao¹, Lirong Zheng³

¹Beijing Key Laboratory of Ionic Liquids Clean Process, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, 100190, Beijing, P.R. China.

Nature Communications

|August 30, 2020

Summary

This study introduces a manganese single-atom catalyst (SAC) for efficient carbon dioxide electroreduction. The novel Mn-N3 site catalyst achieves high CO selectivity and current density, advancing sustainable energy solutions.

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Developing earth-abundant catalysts is crucial for electrochemical CO2 reduction.
Simultaneously achieving high Faradaic efficiency (FE) and CO current density (jCO) remains a significant challenge.

Purpose of the Study:

To design and synthesize a novel manganese single-atom catalyst (SAC) for enhanced CO2 electroreduction.
To investigate the catalytic activity and mechanism of the SAC for CO2 conversion.

Main Methods:

Synthesis of a Mn single-atom catalyst (SAC) with Mn-N3 sites embedded in graphitic carbon nitride.
Electrochemical performance evaluation in aqueous and ionic liquid electrolytes.
In situ X-ray absorption spectra and density functional theory (DFT) calculations.

Main Results:

The Mn SAC achieved a 98.8% CO Faradaic efficiency (FE) with a CO current density (jCO) of 14.0 mA cm-2 at 0.44 V overpotential in aqueous electrolyte.
A higher jCO of 29.7 mA cm-2 was achieved in an ionic liquid electrolyte at 0.62 V overpotential.
Demonstrated superior performance compared to previously reported Mn SACs.

Conclusions:

The Mn-N3 site in the graphitic carbon nitride facilitates CO2 electroreduction by lowering the free energy barrier for the COOH* intermediate formation.
The developed SAC offers a promising pathway for efficient and selective electrochemical CO2 conversion using earth-abundant elements.