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Modeling and Simulation of the Spatial and Light-Intensity Dependence of Product Distributions in an Integrated Photoelectrochemical CO_2 Reduction System

Chen, Yikai and Lewis, Nathan S. and Xiang, Chengxiang (2016) Modeling and Simulation of the Spatial and Light-Intensity Dependence of Product Distributions in an Integrated Photoelectrochemical CO_2 Reduction System. ACS Energy Letters, 2016 (1). pp. 273-280. ISSN 2380-8195. https://resolver.caltech.edu/CaltechAUTHORS:20160627-135527397

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Abstract

A multiphysics model that accounts for the performance of electrocatalysts and triple-junction light absorbers, as well as for the transport properties of the electrolyte and dissolved CO_2, was used to evaluate the spatial and light-intensity dependence of product distributions in an integrated photoelectrochemical CO2 reduction (CO_2R) cell. Different sets of band gap combinations of triple-junction light absorbers were required to accommodate the optimal total operating current density relative to the optimal partial current density for CO_2R. The simulated product distribution was highly nonuniform along the width of the electrode and depended on the electrode dimensions as well as the illumination intensity. To achieve the same product selectivity as in a potentiostatic, “half-cell” configuration, the electrocatalyst must retain its selectivity over a range of cathode potentials, and this range is dependent on the transport losses and current–voltage relationship of the light absorbers, the geometric parameters of the cell, and the illumination intensity.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acsenergylett.6b00134DOIArticle
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.6b00134PublisherArticle
ORCID:
AuthorORCID
Lewis, Nathan S.0000-0001-5245-0538
Xiang, Chengxiang0000-0002-1698-6754
Additional Information:© 2016 American Chemical Society. Received: May 10, 2016 Accepted: June 8, 2016. This material is based upon 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:1
Record Number:CaltechAUTHORS:20160627-135527397
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160627-135527397
Official Citation:Modeling and Simulation of the Spatial and Light-Intensity Dependence of Product Distributions in an Integrated Photoelectrochemical CO2 Reduction System Yikai Chen, Nathan S. Lewis, and Chengxiang Xiang ACS Energy Letters 2016 1 DOI: 10.1021/acsenergylett.6b00134
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68693
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Jun 2016 19:25
Last Modified:09 Mar 2020 13:19

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