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This talk will cover multiple system-level approaches that can be further explored to intensify the electrochemical performance of a flow electrolyzer for CO2RR.
First, we focus on the role of electrolyte composition in the mechanism of CO2RR to CO on Ag nanoparticles (NPs). Insights obtained from polarization curves, Tafel slopes, Pourbaix diagrams, onset potentials, and electrochemical impedance spectroscopy will be used to explain the effects of electrolyte identity, concentration, and pH on the rate determining step.
Next, we cover the systematic process optimization of CO2RR to CO on Ag NPs resulting in state-of-the-art electrochemical performance: CO partial current density (jCO) exceeding 850 mA/cm2 with a CO Faradaic efficiency (FECO) of 98% at a cell potential (Vcell) of -3 V corresponding to a full cell energy efficiency for CO production (EECO) exceeding 40% for a conversion per pass of CO2 to CO exceeding 35%.
Finally, we discuss establishing quantitative/qualitative functional property relationships between system parameters (e.g.: pH, electrolyte flow rate) and system performance (e.g.: cathode overpotentials, jCO) to help in rational system design for CO2RR to CO on Ag NPs. We also briefly discuss the effect of electrolyte composition on performance stability over time for CO2RR to CO on Ag NPs.