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Efficiency Limits for Hydrogen and Formate Production via Fully-Integrated Photoelectrochemical Devices

Fountaine, K. T. and Lewerenz, H. J. (2017) Efficiency Limits for Hydrogen and Formate Production via Fully-Integrated Photoelectrochemical Devices. ECS Transactions, 77 (4). pp. 15-23. ISSN 1938-6737. https://resolver.caltech.edu/CaltechAUTHORS:20180914-100811455

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Abstract

Limiting efficiencies play a critical role in determining the viability of proposed technologies and, consequently, in motivating and guiding device development. Herein we present an analytic, unified framework for fully-integrated photoelectrochemical device performance and apply it to water-splitting and CO_2 reduction reactions for hydrogen and formate production, respectively. An analytic form for the current-voltage relationship of a photoelectrochemical device is used to calculate limiting efficiencies under specific ideal and realistic conditions for single, dual and triple junction photodiode units. Differences in realistic limiting efficiencies for hydrogen and formate production arise not only from disparate catalyst performance but also from design considerations for liquid vs. gas products and realistic operating pH. The results indicate that dual junction devices are sufficient for water-splitting devices, while triple junction devices are more ideal for CO_2 reduction devices with current high performance components.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/07704.0015ecstDOIArticle
ORCID:
AuthorORCID
Fountaine, K. T.0000-0002-0414-8227
Lewerenz, H. J.0000-0001-8433-9471
Additional Information:© 2017 ECS - The Electrochemical Society. We are grateful to Dr. C.X. Xiang for useful discussion regarding realistic CO_2 reduction device designs. This material is based, in part, 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 No. DE-SC0004993.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Issue or Number:4
Record Number:CaltechAUTHORS:20180914-100811455
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180914-100811455
Official Citation:Katherine T. Fountaine and Hans Joachim Lewerenz (Invited) Efficiency Limits for Hydrogen and Formate Production via Fully-Integrated Photoelectrochemical Devices ECS Trans. 2017 77(4): 15-23; doi:10.1149/07704.0015ecst
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89639
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 22:11
Last Modified:03 Oct 2019 20:17

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