CaltechAUTHORS
  A Caltech Library Service

Modeling the Performance of A Flow-Through Gas Diffusion Electrode for Electrochemical Reduction of CO or CO₂

Chen, Yikai and Lewis, Nathan S. and Xiang, Chengxiang (2020) Modeling the Performance of A Flow-Through Gas Diffusion Electrode for Electrochemical Reduction of CO or CO₂. Journal of The Electrochemical Society, 167 (11). Art. No. 114503. ISSN 1945-7111. https://resolver.caltech.edu/CaltechAUTHORS:20200730-073238681

[img] PDF - Published Version
See Usage Policy.

1173Kb
[img] PDF - Supplemental Material
See Usage Policy.

954Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20200730-073238681

Abstract

A flow-through gas diffusion electrode (GDE) consisting of agglomerate catalysts for CO or CO₂ reduction, gas channels for reactants, aqueous electrolytes for ionic transport, and metallic current collectors was simulated and evaluated using a numerical model. The geometric partial current densities and Faradaic Efficiencies (FE) for CH₄, C₂H₄ and H₂ generation in GDEs were calculated and compared to the behavior of analogous aqueous-based planar electrodes. The pH-dependent kinetics for CH₄ and C₂H₄ generation were used to represent the intrinsic catalytic characteristics for the agglomerate catalyst. The modeling indicated that relative to planar electrodes for either CO reduction (COR) or CO₂ reduction (CO₂R), substantial increases in electrochemical reduction rates and Faradaic efficiencies are expected when flow-through GDEs are used. The spatially resolved pH and reaction rates within the flow-through GDEs were also simulated for two different operating pHs, and the resulting transport losses were analyzed quantitatively. For CO₂ reduction, substantial loss of CO₂ via chemical reaction with the locally alkaline electrolyte was observed due to the increased pH in operating GDEs.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/1945-7111/ab987aDOIArticle
ORCID:
AuthorORCID
Chen, Yikai0000-0002-2955-9671
Lewis, Nathan S.0000-0001-5245-0538
Xiang, Chengxiang0000-0002-1698-6754
Additional Information:© 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. Received 15 January 2020; Accepted Manuscript online 1 June 2020; Published 1 July 2020. This material is based on work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Issue or Number:11
Record Number:CaltechAUTHORS:20200730-073238681
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200730-073238681
Official Citation:Yikai Chen et al 2020 J. Electrochem. Soc. 167 114503
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104651
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 Jul 2020 15:50
Last Modified:30 Jul 2020 15:50

Repository Staff Only: item control page