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Engineering In-Bi Bimetallic Alloys in Bismuth-Based Electrocatalysts toward Electrocatalytic CO2 Reduction.
Zeyang Li1,2, Zhe Li1, Yixuan Li1
1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
ACS Applied Materials & Interfaces
|March 19, 2026
Summary
A new indium-bismuth (In-Bi) bimetallic alloy catalyst enhances carbon dioxide (CO2) electroreduction to formate, achieving 97.8% selectivity and high stability. This alloy design overcomes single-metal catalyst limitations for efficient CO2 conversion.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Single-metal catalysts exhibit activity-selectivity trade-offs and deactivation in electrocatalysis.
- Electrocatalytic CO2 reduction to formate is crucial but faces challenges with traditional catalysts.
Purpose of the Study:
- To develop a novel bimetallic alloy electrocatalyst for enhanced CO2 reduction to formate.
- To investigate the structure-activity relationship and reaction mechanism of the In-Bi catalyst.
Main Methods:
- Synthesis of In-Bi bimetallic alloy electrocatalyst.
- In situ spectroscopic characterizations (e.g., FTIR, XAS).
- Density functional theory (DFT) calculations.
Main Results:
- The In-Bi catalyst achieved 97.8% formate selectivity at -700 mA cm-2.
- Exceptional stability was demonstrated over 120 hours of operation.
- Alloying induced electronic reconstruction and created multifunctional interfacial sites.
Conclusions:
- The In-Bi bimetallic alloy effectively addresses limitations of single-metal catalysts.
- Alloying-induced electronic effects and interfacial properties synergistically enhance CO2 electroreduction to formate.
- This design offers a promising pathway for efficient and stable CO2 conversion.
