Combined high alkalinity and pressurization enable efficient CO2 electroreduction to CO

Abstract

The electroreduction of CO ₂ to CO is a promising strategy to utilize CO ₂ emissions while generating a high value product.

Abstract

The electroreduction of carbon dioxide (CO ₂) to carbon monoxide (CO) is a promising strategy to utilize CO ₂ emissions while generating a high value product. Commercial CO ₂ electroreduction systems will require high current densities (>100 mA cm ⁻²) as well as improved energetic efficiencies (EEs), achieved via high CO selectivity and lowered applied potentials. Here we report a silver (Ag)-based system that exhibits the lowest overpotential among CO ₂-to-CO electrolyzers operating at high current densities, 300 mV at 300 mA cm ⁻², with near unity selectivity. We achieve these improvements in voltage efficiency and selectivity via operation in a highly alkaline reaction environment (which decreases overpotentials) and system pressurization (which suppresses the generation of alternative CO ₂ reduction products), respectively. In addition, we report a new record for the highest half-cell EE (>80%) for CO production at 300 mA cm ⁻².