Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.202
Publication date: 18th July 2019
Earth-abundant Sn/Cu catalysts with an optimal surfac composition are highly selective for the electrocatalytic reduction of CO2 to CO in aqueous electrolyte. However, CO2 mass transport limitations, resulting from the low solubility of CO2 in water, so far limit the CO partial current density to about 10 mA·cm-2 [1-2]. To enhance CO2 mass transport, we developed a process to fabricate Sn/Cu-coated polymer nanofiber networks, and demonstrate the materials as gas diffusion electrodes (GDEs) in membrane electrode assemblies for electrochemically converting gaseous CO2 to CO. The Sn/Cu-coated PVDF (Sn/Cu-PVDF) nanofiber GDEs achieve CO faradaic efficiencies (FEs) above 80 %, and maintain high CO partial current densities of up to 104 mA·cm-2. The Sn/Cu-PVDF GDE remains highly stable during extended operation at -1.0 V for 135 hours, with an average FE for CO of > 85 %. These results represent an important step towards an economically viable pathway to CO2RR.
This work was partially supported by InnoSuisse through funding for the Swiss Competence Center for Energy Research (SCCER) Heat and Electricity Storage under contract number 1155-002545. W.J. thanks Mr. Xiaoshuang Li for helpful discussions.
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