Details
| Original language | English |
|---|---|
| Article number | 074509 |
| Number of pages | 17 |
| Journal | Journal of the Electrochemical Society |
| Volume | 171 |
| Issue number | 7 |
| Publication status | Published - 26 Jul 2024 |
Abstract
Platinum-based recombination interlayers (ILs) are a promising approach to mitigate hydrogen and oxygen crossover during proton exchange membrane (PEM) electrolysis. Until now, there are only experimental investigations on this topic, which demonstrate the integral behavior of a PEM electrolysis cell with an IL but do not resolve local effects. This paper addresses these issues by proposing a first model-based approach to investigate the effects of ILs in PEM water electrolysis cells. We focus on local concentration profiles, crossover fluxes, Faraday efficiency, operational limits, and heat generation. The experimentally validated model shows that the IL substantially affects the local concentrations of dissolved hydrogen and oxygen. Depending on pressure condition and current density, different species can limit the recombination reaction in the IL. The results show that ILs can extend the operational window even for high cathode pressures and thin membranes if enough oxygen is present in the IL to recombine the permeating hydrogen. Additionally, we demonstrate that ILs do not influence the Faraday efficiency of the cell due to two counteracting loss mechanisms. Finally, our simulations indicate that the heat generation from the recombination reaction in the IL has almost no effect on the temperature distribution in the cell.
Keywords
- Faraday efficiency, gas recombination catalyst, hydrogen crossover, interlayer, oxygen crossover, proton exchange membrane, water electrolysis
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Surfaces, Coatings and Films
- Chemistry(all)
- Electrochemistry
- Materials Science(all)
- Materials Chemistry
Sustainable Development Goals
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In: Journal of the Electrochemical Society, Vol. 171, No. 7, 074509, 26.07.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Model-Based Investigation of Recombination Interlayers in PEM Water Electrolysis
T2 - Concentration Profiles, Efficiency, and Operational Limits
AU - Brundiers, Steffen
AU - Trinke, Patrick
AU - Bensmann, Boris
AU - Hanke-Rauschenbach, Richard
N1 - Publisher Copyright: © 2024 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
PY - 2024/7/26
Y1 - 2024/7/26
N2 - Platinum-based recombination interlayers (ILs) are a promising approach to mitigate hydrogen and oxygen crossover during proton exchange membrane (PEM) electrolysis. Until now, there are only experimental investigations on this topic, which demonstrate the integral behavior of a PEM electrolysis cell with an IL but do not resolve local effects. This paper addresses these issues by proposing a first model-based approach to investigate the effects of ILs in PEM water electrolysis cells. We focus on local concentration profiles, crossover fluxes, Faraday efficiency, operational limits, and heat generation. The experimentally validated model shows that the IL substantially affects the local concentrations of dissolved hydrogen and oxygen. Depending on pressure condition and current density, different species can limit the recombination reaction in the IL. The results show that ILs can extend the operational window even for high cathode pressures and thin membranes if enough oxygen is present in the IL to recombine the permeating hydrogen. Additionally, we demonstrate that ILs do not influence the Faraday efficiency of the cell due to two counteracting loss mechanisms. Finally, our simulations indicate that the heat generation from the recombination reaction in the IL has almost no effect on the temperature distribution in the cell.
AB - Platinum-based recombination interlayers (ILs) are a promising approach to mitigate hydrogen and oxygen crossover during proton exchange membrane (PEM) electrolysis. Until now, there are only experimental investigations on this topic, which demonstrate the integral behavior of a PEM electrolysis cell with an IL but do not resolve local effects. This paper addresses these issues by proposing a first model-based approach to investigate the effects of ILs in PEM water electrolysis cells. We focus on local concentration profiles, crossover fluxes, Faraday efficiency, operational limits, and heat generation. The experimentally validated model shows that the IL substantially affects the local concentrations of dissolved hydrogen and oxygen. Depending on pressure condition and current density, different species can limit the recombination reaction in the IL. The results show that ILs can extend the operational window even for high cathode pressures and thin membranes if enough oxygen is present in the IL to recombine the permeating hydrogen. Additionally, we demonstrate that ILs do not influence the Faraday efficiency of the cell due to two counteracting loss mechanisms. Finally, our simulations indicate that the heat generation from the recombination reaction in the IL has almost no effect on the temperature distribution in the cell.
KW - Faraday efficiency
KW - gas recombination catalyst
KW - hydrogen crossover
KW - interlayer
KW - oxygen crossover
KW - proton exchange membrane
KW - water electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85199711851&partnerID=8YFLogxK
U2 - 10.1149/1945-7111/ad6212
DO - 10.1149/1945-7111/ad6212
M3 - Article
AN - SCOPUS:85199711851
VL - 171
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
SN - 0013-4651
IS - 7
M1 - 074509
ER -