Electrochemical Science Advances (Journal)

Description

Abstract In the electrochemical reduction of CO2, copper electrodes are well known to be active and selective for a variety of products, depending on process conditions. However, the effect of feed composition on performance has not been extensively investigated, especially with respect to the conversion of CO2to CO. We now show for copper electrodes in a porous tubular configuration (Hollow Fiber Electrodes, HFEs) at a relatively low working potential (−1.1 V vs Ag/AgCl),that an increasing concentration of CO in the feed results in a decreasing CO2conversion rate to CO. Contrary, it is observed that the concomitant hydrogen production rate does not depend on the concentration of CO in the feed. These observations are in good agreement with thermodynamic predictions applying the equation for the Gibbs energy of reaction. On the basis of this conclusion, we anticipate that mass transfer limitations are minimized by the tubular morphology and flow-through mode of operation. Most importantly, this study shows the necessity of a low CO concentration in the feed, to obtain a high CO2conversionrate.

Period	12 Jan 2022
Type of journal	Journal
ISSN	2698-5977
Degree of Recognition	International