Ressource pédagogique : Jesus Iniesta - Electrochemical and structural characterization of mixed matrix membrane coated electrodes for CO2 electroreduction

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The need for novel membrane coated electrodes (MCE) for the electrochemical reduction of carbon dioxide (CO2RR) may offer advantages in terms of control of reaction, catalytic activity and stability of the electrode. The study of the possibilities of mixed matrix membrane (MMM) overlayers with tuneable ion-exchangeable, conductive and transport properties are essential targets for the performance of the MCEs for electrochemical applications. The knowledge on the effect of local pH and CO2 concentration diffusion to catalyst site, among others, on the selectivity of the CO2 electroreduction to high added-value products under alkaline conditions, especially when using Cu as catalyst, is still scarce. The communication aims at evaluating the relationship of the synthesis and morphological characterization of the MCEs and the electrochemical characterization of novel based copper-containing MMMCE with high CO2 permeability, chemical and mechanical stability in alkaline solutions, on the performance, selectivity and stability of electrodes in CO2RR. Cyclic voltammetry and electrochemical impedance spectroscopy will give insight about the electrochemical behaviour pf MCEs in comparison with the typically used gas diffusion electrodes (GDEs) prepared with commercial ionomers. Preliminary electrolysis for the CO2RR will reveal the significant impact of the presence of the polymeric membrane overlayer on the efficiency and selectivity of CO2RR.  

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