Highly Selective and Scalable Electrolysis for Gaseous CO_2 Reduction in the Zero-Gap Electrolyzer

摘要

The electroreduction of carbon dioxide (CO_2) to chemicals represents a promising pathway for the storage of renewable electricity and toward low-carbon-footprint chemicals production. Prior study on CO_2RR have focused on the catalytic properties of various materials in liquid condition. However, the current density for CO_2RR is restricted under 30 mA cm~(-2) due to the mass transfer limit and low solubility of CO_2 in the aqueous solution. To increase the current density, the gas fed CO_2 electrolysis system was investigated using a gas-diffusion layer (GDL) system. Masel et al. reported about new zero-gap CO_2 electrolysis device that uses an anion exchange membrane (AEM, SustainionTM) with humidified CO_2 flow in the cathode and shows a current density of 200 mA cm~(-2) with steady FE_(CO) of over 90% using Ag catalyst.