Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.112
Publication date: 11th July 2022
We report the use of a silver sputtered gas diffusion electrode (GDE) for electrochemical CO2 reduction in a membrane electrode assembly and probe the factors affecting catalyst utilization at high current densities. Catalyst utilization is significantly affected by the gas flow channel design at the cathode which distributes the reactant to the catalyst sites. The high pressure drop present in a serpentine flow channel enables a partial current density of 205 mA/cm2 for CO production at a cell voltage of 2.76V. Double layer capacitance measurements reveal significant differences in catalyst wetting between the flow patterns due to changes in pressure drop, salt precipitation at the cathode and reactant distribution at the surface of the GDE. Modelling of the gas flow channel and GDE reveals inhomogeneity in reactant distribution affecting catalyst utilization significantly. These findings can be used to formulate design rules for maximizing catalyst utilization in zero gap CO2 electrolyzers.
Thomas Burdyny and Siddhartha Subramanian would like to acknowledge the co-financing provided by Shell and a PPP-allowance from Top Consortia for Knowledge and Innovation (TKI’s) of the Ministry of Economic Affairs and Climate in the context of the TU Delft e-Refinery Institute. TB would also like to acknowledge the NWO for an individual Veni grant.
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