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

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Published on: April 10, 2018

Surface-Enriched Room-Temperature Liquid Bismuth for Catalytic CO₂ Reduction.

Jining Guo^1,2, Xing Zhi³, Dingqi Wang¹

¹Department of Chemical Engineering, The University of Melbourne, Parkville, VIC, 3010, Australia.

Small (Weinheim an Der Bergstrasse, Germany)

|May 15, 2024

Summary

Researchers developed a novel liquid bismuth catalyst on a gallium surface for efficient carbon dioxide (CO2) reduction to formate. This breakthrough overcomes solid catalyst limitations, offering enhanced stability and performance in electrochemical CO2RR.

Keywords:

CO2 reduction bismuth density functional calculations electrocatalyst liquid Metal metal–metal interactions

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Published on: December 6, 2021

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Bismuth-based electrocatalysts show promise for carbon dioxide (CO2) reduction to formate.
Solid-state catalysts suffer from deactivation, reduced current densities, and lower Faradaic efficiencies at room temperature.

Purpose of the Study:

To develop a high-performing, stable electrocatalyst for CO2 reduction at ambient conditions.
To investigate the potential of liquid metal catalysts for electrochemical CO2RR.

Main Methods:

Formation of a liquid bismuth catalyst by doping trace bismuth into liquid gallium.
Electrochemical characterization of the liquid catalyst for CO2 reduction.
Ab initio molecular simulations and density functional theory (DFT) calculations to understand catalytic mechanisms.

Main Results:

Achieved exceptional performance in electrochemical CO2 reduction to formate with 98% Faradaic efficiency over 80 hours.
Created a liquid bismuth catalyst with 30 at% bismuth enrichment on a gallium surface without aggregation.
Identified liquid bismuth sites as energetically favorable for CO2RR intermediates, outperforming solid bismuth and GaBi sites.

Conclusions:

Liquid bismuth catalysts on gallium surfaces offer superior performance and stability for CO2 electroreduction compared to solid counterparts.
This work introduces a new strategy for designing high-performance liquid-state metallic electrocatalysts.
The findings pave the way for advanced catalysts in electrochemical CO2 conversion.