(127e) An Investigation of Surface-Functionalized Electrocatalysts for Efficient CO2 Reduction to Multi-Carbon Products
AIChE Annual Meeting
2020 Virtual AIChE Annual Meeting
Catalysis and Reaction Engineering Division
Electrochemical CO2 Conversion II
Tuesday, November 17, 2020 - 9:00am to 9:15am
Several examples from (non-electrochemical) heterogeneous catalysis illustrate how adsorbed organic ligands can be used to tune activity and selectivity due to the emergence of electronic and geometric effects, but this powerful strategy of using surface modifiers remains relatively unexplored in the context of CO2 reduction. Nevertheless, recent reports provide compelling evidence of its potential: for instance, Buonsanti et al. showed the promoting effect on CO evolution of imidazolium-based ligands anchored to the surface of silver nanoparticles, and a recent publication by Sargent et al. demonstrated how N-aryl-pyridinium-functionalized copper electrodes attain high Faradaic efficiency for CO2 reduction to ethylene at elevated current densities.
In this contribution, we show how the adsorption of sub-monolayer coverages of small organic ligands influences the eCO2RR selectivity patterns of well-defined metallic surfaces. In tandem with the characterization of the functionalized surfaces by x-ray photoelectron and infrared spectroscopies, these findings provide unique insights into the impact of adsorbed organic molecules on CO2 reduction, informing the development of a new strategy with the potential to achieve breakthrough advances toward the production of multi-carbon compounds.
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