2D Metal Oxyhalide-Derived Catalysts for Efficient CO₂ Electroreduction.

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2) is crucial for storing renewable energy as carbon-based fuels.
• Developing efficient catalysts with high activity, selectivity, and low overpotential is essential for CO2 reduction.
• Metal catalyst surface reconstruction under operating conditions poses challenges for catalyst design.

Purpose of the Study:

• To develop a novel 2D bismuth-based catalyst for efficient electrochemical CO2 reduction.
• To enhance catalyst selectivity and current density for formic acid production.
• To overcome limitations of traditional catalysts, such as limited partial current densities.

Main Methods:

• A templating strategy using bismuth oxyhalides (BiOBr) to derive 2D bismuth-based catalysts.
• Characterization of catalyst structure and surface properties, focusing on facet exposure.
• Electrochemical testing of the catalyst for CO2 reduction reaction (CO2RR) performance.

Main Results:

• The BiOBr-templated catalyst demonstrated preferential exposure of highly active Bi facets.
• Achieved over 90% Faradaic efficiency for CO2 reduction selectivity.
• Attained stable current densities up to 200 mA cm-2, doubling formic acid production compared to previous bismuth catalysts.

Conclusions:

• The templating approach using BiOBr is effective for creating highly selective and active 2D bismuth catalysts.
• The developed catalyst significantly improves the efficiency of electrochemical CO2 reduction to formic acid.
• This strategy offers a promising pathway for designing advanced catalysts for renewable energy storage.