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Updated: May 20, 2025

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

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A Triatomic Cobalt Catalyst for Oxygen Electrocatalysis.

Tianmi Tang¹, Xiaoqin Xu¹, Xue Bai¹

¹Institute of Physical Chemistry, College of Chemistry, Jilin University, 2519 Jiefang Road, Changchun, 130021, P.R. China.

Angewandte Chemie (International Ed. in English)

|March 25, 2025

Summary

Researchers developed a new triatomic cobalt catalyst (Co3-NG) using ultrafast printing for rechargeable zinc-air batteries. This catalyst shows excellent bifunctional oxygen reduction/evolution reaction (ORR/OER) activity and stability, outperforming current benchmarks.

Keywords:

Bifunctional electrocatalyst In situ XAS Oxygen reduction reaction Rechargeable Zn–air battery Triatomic catalyst

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Rechargeable zinc-air batteries require efficient bifunctional oxygen electrocatalysts for oxygen reduction/evolution reactions (ORR/OER).
Designing electrocatalysts with both high activity and long-term stability for ORR/OER remains a significant challenge.

Purpose of the Study:

To develop a novel, highly efficient, and stable bifunctional electrocatalyst for rechargeable zinc-air batteries.
To investigate the catalytic mechanism and structure-activity relationship of the new catalyst.

Main Methods:

Ultrafast printing method to embed a triatomic cobalt complex precursor onto graphene nanosheets, forming a triatomic catalyst (Co3-NG).
Electrochemical testing of Co3-NG for ORR and OER performance, including zinc-air battery assembly and cycling tests.
In situ X-ray absorption spectroscopy (XAS) and theoretical calculations to identify active sites and understand the catalytic mechanism.

Main Results:

The Co3-NG catalyst demonstrated excellent bifunctional ORR (Ehalf-wave = 0.903 V) and OER (Ej=10 = 1.596 V) performance.
Co3-NG-based zinc-air batteries achieved a maximum power density of 189.0 mW cm-2 and stable cycling over 3000 cycles, surpassing the Pt/C + RuO2 benchmark.
In situ XAS and calculations identified Co3ON6 as the active site, with triangular pyramidal structures regulating electronic configuration for enhanced oxygen intermediate adsorption/desorption.

Conclusions:

The triatomic cobalt catalyst (Co3-NG) offers superior bifunctional ORR/OER activity and durability for rechargeable zinc-air batteries.
The study highlights the critical role of triatomic active center geometry and electronic structure in optimizing electrocatalyst performance.
This work provides a new strategy for designing advanced electrocatalysts for electrochemical energy applications.