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Comparative Study of Different Polymeric Binders in Electrochemical CO Reduction.
Noémi V Galbicsek1, Attila Kormányos1, Gergely Ferenc Samu2,3
1Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary.
Energy & Fuels : an American Chemical Society Journal
|November 27, 2024
Summary
Optimizing cathode catalyst layers with polymeric binders enhances carbon monoxide electrolysis for chemical production. Binder hydrophobicity is key to achieving high reaction rates and efficient electrochemical conversion.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Electrochemical reduction of carbon monoxide (CO) is a promising pathway for synthesizing valuable chemicals from carbon dioxide (CO2).
- Achieving high production rates requires significantly higher current densities for CO electrolysis compared to CO2 electrolysis.
- Gas diffusion electrodes (GDEs) are critical for enabling these high reaction rates.
Purpose of the Study:
- To systematically investigate the impact of polymeric binder structure on cathode catalyst layers for high-rate CO electrolysis.
- To identify key binder properties that facilitate efficient electrochemical CO reduction.
- To demonstrate the feasibility of sustained high-current density CO electrolysis.
Main Methods:
- Systematic variation of cathode catalyst layer structure using diverse polymeric binders with different functional groups and fluorination levels.
- Surface-wetting characterization techniques to assess catalyst layer properties.
- Electrochemical CO electrolysis experiments at high current densities (up to 1 A cm-2).
Main Results:
- Different polymeric binders, including linear and partially fluorinated polymers, were evaluated for their effect on CO electrolysis performance.
- Binder hydrophobicity was identified as a crucial factor for achieving high reaction rates in CO electrolysis.
- Performance comparable to state-of-the-art binders was achieved with specific binder modifications.
- Sustained CO electrolysis at 1 A cm-2 for several hours was successfully demonstrated using polyvinylidene fluoride (PVDF) as the binder.
Conclusions:
- The hydrophobicity imparted by the binder in the catalyst layer is essential for high-rate CO electrolysis.
- Tailoring binder properties offers a viable strategy to enhance the efficiency and scalability of electrochemical CO conversion.
- PVDF demonstrates potential as an effective binder for high-performance CO electrolyzers.
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