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Conversion of a CO–CO2 co‐feed with a porous tubular copper catalyst at low potential

Authors :
Anne Clara Sustronk
Nieck Edwin Benes
Guido Mul
Source :
Electrochemical Science Advances, Vol 3, Iss 2, Pp n/a-n/a (2023)
Publication Year :
2023
Publisher :
Wiley-VCH, 2023.

Abstract

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 CO2 to CO. We now show for copper electrodes in a porous tubular configuration (Hollow Fibre 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 CO2 conversion 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 CO2 conversion rate.

Details

Language :
English
ISSN :
26985977 and 20210019
Volume :
3
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Electrochemical Science Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.2db7affb7ac24643b0532f751b26433f
Document Type :
article
Full Text :
https://doi.org/10.1002/elsa.202100198