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Bimetallic Bi-In interfaces on micropyramidal silicon for efficient solar-driven CO₂-to-formate conversion.

Manel Machreki¹, Marielle Blot¹, Antoine Vacher¹

¹Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR6226, F-35000 Rennes, France. bruno.fabre@univ-rennes.fr.

Chemical Communications (Cambridge, England)

|July 2, 2026

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This study shows that bismuth-indium catalysts on silicon can convert carbon dioxide (CO2) into formate using light. This method improves efficiency for solar-driven CO2 reduction.

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Carbon dioxide (CO2) conversion is crucial for sustainable energy.
Developing efficient catalysts for CO2 reduction is an ongoing challenge.

Purpose of the Study:

To investigate the use of bismuth-indium catalysts on micropyramidal silicon for selective CO2 photoelectroreduction.
To enhance charge transfer and improve formate production through bimetallic interface engineering.

Main Methods:

Fabrication of micropyramidal silicon structures.
Decoration with bismuth-indium bimetallic catalysts.
Photoelectrochemical measurements to assess CO2 reduction to formate.

Main Results:

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Selective photoelectroreduction of CO2 to formate was achieved.

Bimetallic interface engineering significantly enhanced charge transfer.

Improved photocurrent and formate production compared to monometallic catalysts.

Conclusions:

Micropyramidal silicon decorated with bismuth-indium is an effective system for solar-driven CO2 conversion.
Bimetallic interface engineering is a viable strategy to boost catalytic performance.
This approach offers a simple yet efficient pathway for sustainable formate production.