Journal article
Enriching Surface-Accessible CO2 in the Zero-Gap Anion-Exchange-Membrane-Based CO2 Electrolyzer
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark1
Department of Physics, Technical University of Denmark2
Catalysis Theory Center, Department of Physics, Technical University of Denmark3
Department of Energy Conversion and Storage, Technical University of Denmark4
Computational Atomic-scale Materials Design, Department of Physics, Technical University of Denmark5
Atomic Scale Materials Modelling, Department of Energy Conversion and Storage, Technical University of Denmark6
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 jCO of 368 ± 28 mA cmgeo-2 was achieved for the commercial silver catalyst.
| Language: | English |
|---|---|
| Publisher: | John Wiley and Sons Inc. |
| Year: | 2023 |
| Pages: | e202214383 |
| ISSN: | 15213773 and 14337851 |
| Types: | Journal article |
| DOI: | 10.1002/anie.202214383 |
| ORCIDs: | Xu, Qiucheng , Seger, Brian , Xu, Aoni , Garg, Sahil , Moss, Asger , Chorkendorff, Ib and Bligaard, Thomas |
Carbon Dioxide Reduction Membrane-Electrode Assemblies Pulse Methods
