Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 335, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122885
Keywords
Power to value; Carbon dioxide electroreduction; Stability; Precipitation; GDE flooding
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We investigated the role of ionomers in gas diffusion electrodes (GDEs) for CO2-to-CO electrolysis and compared the performance of two commonly used ionomer materials, Nafion and Fumion. Our results showed that Fumion-containing inks were superior to Nafion-based ones in terms of CO selectivity and longer lifespan, due to their ability to suppress precipitation inside the GDE structure.
We study the role of binders (ionomers) in determining the life-span of gas diffusion electrodes (GDEs) used for high throughput CO2-to-CO electrolysis. We compare two typical ionomer materials (Nafion and Fumion, both are widely used for the preparation of Ag nanoparticles-based catalyst inks) to show that when used in zero-gap membrane/electrode assemblies, Fumion-containing inks are superior to Nafion-based ones and can uphold a very high CO-selectivity in the electrochemical CO2 reduction reaction for longer time. This is due to the ability of Fumion containing inks to suppress precipitation inside the GDE structure. As Fumion-fixed GDEs are significantly less hydrophobic than Nafion-fixed ones, our results contradict the widely accepted opinion that it is their non-wettability what mostly protects CO2-reducing GDEs from flooding. In turn, we argue that it is more important to maintain efficient electrolyte drainage pathways in the GDE structure, and explain the superiority of Fumion-fixed GDEs on this basis.
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