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Henckel, Danielle; Saha, Prantik; Intia, Fry; Taylor, Audrey K.; Baez-Cotto, Carlos; Hu, Leiming; Schellekens, Maarten; Simonson, Hunter; Miller, Elisa M.; Verma, Sumit; Mauger, Scott; Smith, Wilson A.; Neyerlin, K. C.
ACS applied materials & interfaces, 01/2024, Letnik: 16, Številka: 3Journal Article
This work utilizes EIS to elucidate the impact of catalyst–ionomer interactions and cathode hydroxide ion transport resistance (R CL,OH– ) on cell voltage and product selectivity for the electrochemical conversion of CO to ethylene. When using the same Cu catalyst and a Nafion ionomer, varying ink dispersion and electrode deposition methods results in a change of 2 orders of magnitude for R CL,OH– and ca. a 25% change in electrode porosity. Decreasing R CL,OH– results in improved ethylene Faradaic efficiency (FE), up to ∼57%, decrease in hydrogen FE, by ∼36%, and reduction in cell voltage by up to 1 V at 700 mA/cm2. Through the optimization of electrode fabrication conditions, we achieve a maximum of 48% ethylene with >90% FE for non-hydrogen products in a 25 cm2 membrane electrode assembly at 700 mA/cm2 and <3 V. Additionally, the implications of optimizing R CL,OH– is translated to other material requirements, such as anode porosity. We find that the best performing electrodes use ink dispersion and deposition techniques that project well into roll-to-roll processes, demonstrating the scalability of the optimized process.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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