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Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design

Robert Phillips, Adam Edwards, Bertrand Rome, Daniel R. Jones, Charles W. Dunnill, Charlie Dunnill Orcid Logo

International Journal of Hydrogen Energy, Volume: 42, Issue: 38, Pages: 23986 - 23994

Swansea University Author: Charlie Dunnill Orcid Logo

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DOI (Published version): 10.1016/j.ijhydene.2017.07.184

Abstract

The efficiency of an alkaline electrolysis cell depends strongly on its internal cell resistance, which becomes the dominant efficiency driver at high current densities. This paper uses Electrochemical Impedance Spectroscopy to decouple the ohmic resistance from the cell voltage, and, for the first...

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Published in: International Journal of Hydrogen Energy
ISSN: 03603199
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34946
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first_indexed 2017-08-21T18:50:37Z
last_indexed 2022-04-28T02:56:59Z
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spelling 2022-04-27T12:09:02.3392687 v2 34946 2017-08-21 Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design 0c4af8958eda0d2e914a5edc3210cd9e 0000-0003-4052-6931 Charlie Dunnill Charlie Dunnill true false 2017-08-21 CHEG The efficiency of an alkaline electrolysis cell depends strongly on its internal cell resistance, which becomes the dominant efficiency driver at high current densities. This paper uses Electrochemical Impedance Spectroscopy to decouple the ohmic resistance from the cell voltage, and, for the first time, quantify the reduction in cell resistance achieved by employing a zero gap cell configuration when compared to the conventional approach. A 30% reduction in ohmic resistance is demonstrated for the zero gap cell when compared to a more conventional design with a 2 mm electrode gap (in 1 M NaOH and at standard conditions). The effect on the ohmic resistance of operating parameters, including current density and temperature, is quantified; the zero gap cell outperforms the standard cell at all current densities, particularly above 500 mA·cm−2 Furthermore, the effect of electrode morphology on the ohmic resistance is investigated, showing that high surface area foam electrodes permit a lower ohmic resistance than coarser mesh electrodes. These results show that zero gap cell design will allow both low cost and highly efficient alkaline electrolysis, which will become a key technology for short term and inter-seasonal energy storage and accelerate the transition towards a decarbonised society. Journal Article International Journal of Hydrogen Energy 42 38 23986 23994 03603199 Alkaline electrolysis; Electrochemical impedance spectroscopy; Zero gap; Porous electrodes; Renewable energy storage 31 12 2017 2017-12-31 10.1016/j.ijhydene.2017.07.184 COLLEGE NANME Chemical Engineering COLLEGE CODE CHEG Swansea University 2022-04-27T12:09:02.3392687 2017-08-21T13:38:26.3857787 Faculty of Science and Engineering School of Engineering and Applied Sciences - Chemical Engineering Robert Phillips 1 Adam Edwards 2 Bertrand Rome 3 Daniel R. Jones 4 Charles W. Dunnill 5 Charlie Dunnill 0000-0003-4052-6931 6 0034946-21082017134009.pdf phillips2017(3).pdf 2017-08-21T13:40:09.3330000 Output 1260250 application/pdf Accepted Manuscript true 2018-08-14T00:00:00.0000000 true eng
title Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
spellingShingle Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
Charlie Dunnill
title_short Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
title_full Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
title_fullStr Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
title_full_unstemmed Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
title_sort Minimising the ohmic resistance of an alkaline electrolysis cell through effective cell design
author_id_str_mv 0c4af8958eda0d2e914a5edc3210cd9e
author_id_fullname_str_mv 0c4af8958eda0d2e914a5edc3210cd9e_***_Charlie Dunnill
author Charlie Dunnill
author2 Robert Phillips
Adam Edwards
Bertrand Rome
Daniel R. Jones
Charles W. Dunnill
Charlie Dunnill
format Journal article
container_title International Journal of Hydrogen Energy
container_volume 42
container_issue 38
container_start_page 23986
publishDate 2017
institution Swansea University
issn 03603199
doi_str_mv 10.1016/j.ijhydene.2017.07.184
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Chemical Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Chemical Engineering
document_store_str 1
active_str 0
description The efficiency of an alkaline electrolysis cell depends strongly on its internal cell resistance, which becomes the dominant efficiency driver at high current densities. This paper uses Electrochemical Impedance Spectroscopy to decouple the ohmic resistance from the cell voltage, and, for the first time, quantify the reduction in cell resistance achieved by employing a zero gap cell configuration when compared to the conventional approach. A 30% reduction in ohmic resistance is demonstrated for the zero gap cell when compared to a more conventional design with a 2 mm electrode gap (in 1 M NaOH and at standard conditions). The effect on the ohmic resistance of operating parameters, including current density and temperature, is quantified; the zero gap cell outperforms the standard cell at all current densities, particularly above 500 mA·cm−2 Furthermore, the effect of electrode morphology on the ohmic resistance is investigated, showing that high surface area foam electrodes permit a lower ohmic resistance than coarser mesh electrodes. These results show that zero gap cell design will allow both low cost and highly efficient alkaline electrolysis, which will become a key technology for short term and inter-seasonal energy storage and accelerate the transition towards a decarbonised society.
published_date 2017-12-31T03:43:23Z
_version_ 1763752021419098112
score 11.036378

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