Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 62, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202214383
Keywords
Carbon Dioxide Reduction; Electrocatalysis; Membrane-Electrode Assemblies; Pulse Methods
Categories
Ask authors/readers for more resources
In this study, a descriptor called surface-accessible CO2 concentration ([CO2](SA)) was developed to indicate the limits of CO2-to-CO conversion in CO2 electrolysis. Three general strategies were identified to enrich [CO2](SA), resulting in improved performance. The maximum j(CO) achieved was 368 +/- 28 mA cm(geo)(-2) using a commercial silver catalyst.
Zero-gap anion exchange membrane (AEM)-based CO2 electrolysis is a promising technology for CO production, however, their performance at elevated current densities still suffers from the low local CO2 concentration due to heavy CO2 neutralization. Herein, via modulating the CO2 feed mode and quantitative analyzing CO2 utilization with the aid of mass transport modeling, we develop a descriptor denoted as the surface-accessible CO2 concentration ([CO2](SA)), which enables us to indicate the transient state of the local [CO2]/[OH-] ratio and helps define the limits of CO2-to-CO conversion. To enrich the [CO2](SA), we developed three general strategies: (1) increasing catalyst layer thickness, (2) elevating CO2 pressure, and (3) applying a pulsed electrochemical (PE) method. Notably, an optimized PE method allows to keep the [CO2](SA) at a high level by utilizing the dynamic balance period of CO2 neutralization. A maximum j(CO) of 368 +/- 28 mA cm(geo)(-2) was achieved using a commercial silver catalyst.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available