Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide

This study explores the unique operating behavior of an alkaline water electrolysis cell equipped with an ion-solvating membrane, operated with a diluted alkaline electrolyte, specifically 1-M potassium hydroxide (1M KOH), in anode feed mode. Our investigations reveal several key insights. Charge tr...

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Main Authors: Dieter Jarosch, John James Warren, Jörg Kapischke
Format: Article
Language:English
Published: Elsevier 2025-01-01
Series:Heliyon
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Online Access:http://www.sciencedirect.com/science/article/pii/S2405844025004554
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author Dieter Jarosch
John James Warren
Jörg Kapischke
author_facet Dieter Jarosch
John James Warren
Jörg Kapischke
author_sort Dieter Jarosch
collection DOAJ
description This study explores the unique operating behavior of an alkaline water electrolysis cell equipped with an ion-solvating membrane, operated with a diluted alkaline electrolyte, specifically 1-M potassium hydroxide (1M KOH), in anode feed mode. Our investigations reveal several key insights. Charge transport: In an ion-solvating membrane, charge transport occurs through both the cations and anions of the electrolyte. Due to electro-osmosis, cation transport to the cathode results in a combined hydrogen-electrolyte discharge from the cathode compartment of the electrolysis cell. The discharged electrolyte is more concentrated than the electrolyte supplied to the anode. The concentration and flow rate of the electrolyte increase with current density and electrolyte temperature. Current density dependence: Since only a fraction of the total charge is transferred by hydroxide ions within the membrane, current density strongly depends on the electrolyte flow through the anode compartment. Membrane stability and performance: The membrane's mechanical and chemical stability enables operation at high temperatures, up to 80 °C. This stability enables increased current density at a given cell voltage. Effects of catalyst use: Using cathode catalysts with high surface areas, such as Raney-Ni, enhances current density because highly concentrated liquid potassium hydroxide forms at the cathode during operation. Anode catalysts with high surface areas increase current density, but only if the flow of hydroxide ions is not impeded. Otherwise, the jV-curve exhibits transport-limited behavior.
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spelling doaj-art-3de20a140f5d495a989674d9fb5781ce2025-02-02T05:28:56ZengElsevierHeliyon2405-84402025-01-01112e42075Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxideDieter Jarosch0John James Warren1Jörg Kapischke2Corresponding author.; Ansbach University of Applied Sciences, Ansbach, 91522, GermanyAnsbach University of Applied Sciences, Ansbach, 91522, GermanyAnsbach University of Applied Sciences, Ansbach, 91522, GermanyThis study explores the unique operating behavior of an alkaline water electrolysis cell equipped with an ion-solvating membrane, operated with a diluted alkaline electrolyte, specifically 1-M potassium hydroxide (1M KOH), in anode feed mode. Our investigations reveal several key insights. Charge transport: In an ion-solvating membrane, charge transport occurs through both the cations and anions of the electrolyte. Due to electro-osmosis, cation transport to the cathode results in a combined hydrogen-electrolyte discharge from the cathode compartment of the electrolysis cell. The discharged electrolyte is more concentrated than the electrolyte supplied to the anode. The concentration and flow rate of the electrolyte increase with current density and electrolyte temperature. Current density dependence: Since only a fraction of the total charge is transferred by hydroxide ions within the membrane, current density strongly depends on the electrolyte flow through the anode compartment. Membrane stability and performance: The membrane's mechanical and chemical stability enables operation at high temperatures, up to 80 °C. This stability enables increased current density at a given cell voltage. Effects of catalyst use: Using cathode catalysts with high surface areas, such as Raney-Ni, enhances current density because highly concentrated liquid potassium hydroxide forms at the cathode during operation. Anode catalysts with high surface areas increase current density, but only if the flow of hydroxide ions is not impeded. Otherwise, the jV-curve exhibits transport-limited behavior.http://www.sciencedirect.com/science/article/pii/S2405844025004554Anion exchange membrane water electrolysisIon-solvating membranePermselectivityDiluted potassium hydroxide solution as electrolyteElectrolyte concentration changesElectrolyte flow rate
spellingShingle Dieter Jarosch
John James Warren
Jörg Kapischke
Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
Heliyon
Anion exchange membrane water electrolysis
Ion-solvating membrane
Permselectivity
Diluted potassium hydroxide solution as electrolyte
Electrolyte concentration changes
Electrolyte flow rate
title Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
title_full Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
title_fullStr Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
title_full_unstemmed Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
title_short Experimental investigation into the functionality of alkaline water electrolysis with ion-solvating membrane in anode feed mode using diluted potassium hydroxide
title_sort experimental investigation into the functionality of alkaline water electrolysis with ion solvating membrane in anode feed mode using diluted potassium hydroxide
topic Anion exchange membrane water electrolysis
Ion-solvating membrane
Permselectivity
Diluted potassium hydroxide solution as electrolyte
Electrolyte concentration changes
Electrolyte flow rate
url http://www.sciencedirect.com/science/article/pii/S2405844025004554
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AT johnjameswarren experimentalinvestigationintothefunctionalityofalkalinewaterelectrolysiswithionsolvatingmembraneinanodefeedmodeusingdilutedpotassiumhydroxide
AT jorgkapischke experimentalinvestigationintothefunctionalityofalkalinewaterelectrolysiswithionsolvatingmembraneinanodefeedmodeusingdilutedpotassiumhydroxide