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Evaluation of flow schemes for near-neutral pH electrolytes in solar-fuel generators

Singh, Meenesh R. and Xiang, Chengxiang and Lewis, Nathan S. (2017) Evaluation of flow schemes for near-neutral pH electrolytes in solar-fuel generators. Sustainable Energy and Fuels, 1 (3). pp. 458-466. ISSN 2398-4902. https://resolver.caltech.edu/CaltechAUTHORS:20170317-120009870

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Abstract

The electrochemical performance of three different types of membrane-containing electrolyte-flow schemes for solar-driven water splitting has been studied quantitatively using 1-dimensional and 2-dimensional multi-physics models. The three schemes include a recirculation scheme with a well-mixed bulk electrolyte, a recirculation scheme with laminar flow fields, and a fresh-feed scheme with laminar flow fields. The Nernstian potential loss associated with pH gradients at the electrode surfaces, the resistive loss between the cathode and anode, the product-gas crossovers, and the required pumping energy in all three schemes have been evaluated as a function of the operational current density, the flow rates for the electrolyte, and the physical dimensions of the devices. The trade-offs in the voltage loss, safety considerations, and energy inputs from the balance-of-systems required to produce a practical device have been evaluated and compared to membrane-free devices as well as to devices that operate at extreme pH values.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://dx.doi.org/10.1039/C7SE00062FDOIArticle
http://pubs.rsc.org/en/content/articlelanding/2017/se/c7se00062fPublisherArticle
http://www.rsc.org/suppdata/c7/se/c7se00062f/c7se00062f1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Singh, Meenesh R.0000-0002-3638-8866
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2017 Royal Society of Chemistry. Received 01 Feb 2017, Accepted 23 Feb 2017. First published online 23 Feb 2017. This material is based on the 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:3
Record Number:CaltechAUTHORS:20170317-120009870
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170317-120009870
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75204
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Mar 2017 21:08
Last Modified:03 Oct 2019 16:47

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