Details
| Original language | English |
|---|---|
| Article number | 235375 |
| Number of pages | 14 |
| Journal | Journal of power sources |
| Volume | 622 |
| Early online date | 9 Sept 2024 |
| Publication status | E-pub ahead of print - 9 Sept 2024 |
Abstract
Inductive loops at low frequencies in impedance spectra of proton exchange membrane (PEM) water electrolysis cells remain largely unexplored, yet they hold potential for performance enhancement due to their positive impact on the overall cell resistance. This study investigates inductive loops at low frequencies by impedance spectroscopy and subsequent Distribution of Relaxation Times (DRT) analysis. The positive impact of the inductive loops is verified by voltage current scan measurements. Variations of operational and structural parameters, like membrane and catalyst layer properties and impregnated porous transport layers are performed to understand the origin of the inductive feature and its interplay with mass transport related processes. Our findings reveal a significant impact of current density and voltage, temperature and membrane thickness on the inductive loop. Measurements via reference electrodes show a stronger correlation to the anode. Mass transport losses and the inductive loops are occurring in similar frequency ranges. Such overlapping of both effects with apparently positive and negative resistances can result in compensation in the spectra. The size of the inductive loops, which might even exceed the capacitive polarization resistance, and their dependence on the membrane thickness indicate that processes in the membrane are responsible for the observed behavior.
Keywords
- Distribution of relaxation times, EIS, Inductive loops, Low frequency, Negative polarization resistance, PEM electrolysis
ASJC Scopus subject areas
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Energy(all)
- Energy Engineering and Power Technology
- Chemistry(all)
- Physical and Theoretical Chemistry
- Engineering(all)
- Electrical and Electronic Engineering
Sustainable Development Goals
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In: Journal of power sources, Vol. 622, 235375, 01.12.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Inductive loops in impedance spectra of PEM water electrolyzers
AU - Brinker, Debora
AU - Hensle, Niklas
AU - Horstmann de la Viña, Jerónimo
AU - Franzetti, Irene
AU - Bühre, Lena V.
AU - Andaluri, Umesh Anirudh
AU - Menke, Charlotte
AU - Smolinka, Tom
AU - Weber, André
N1 - Publisher Copyright: © 2024 The Authors
PY - 2024/9/9
Y1 - 2024/9/9
N2 - Inductive loops at low frequencies in impedance spectra of proton exchange membrane (PEM) water electrolysis cells remain largely unexplored, yet they hold potential for performance enhancement due to their positive impact on the overall cell resistance. This study investigates inductive loops at low frequencies by impedance spectroscopy and subsequent Distribution of Relaxation Times (DRT) analysis. The positive impact of the inductive loops is verified by voltage current scan measurements. Variations of operational and structural parameters, like membrane and catalyst layer properties and impregnated porous transport layers are performed to understand the origin of the inductive feature and its interplay with mass transport related processes. Our findings reveal a significant impact of current density and voltage, temperature and membrane thickness on the inductive loop. Measurements via reference electrodes show a stronger correlation to the anode. Mass transport losses and the inductive loops are occurring in similar frequency ranges. Such overlapping of both effects with apparently positive and negative resistances can result in compensation in the spectra. The size of the inductive loops, which might even exceed the capacitive polarization resistance, and their dependence on the membrane thickness indicate that processes in the membrane are responsible for the observed behavior.
AB - Inductive loops at low frequencies in impedance spectra of proton exchange membrane (PEM) water electrolysis cells remain largely unexplored, yet they hold potential for performance enhancement due to their positive impact on the overall cell resistance. This study investigates inductive loops at low frequencies by impedance spectroscopy and subsequent Distribution of Relaxation Times (DRT) analysis. The positive impact of the inductive loops is verified by voltage current scan measurements. Variations of operational and structural parameters, like membrane and catalyst layer properties and impregnated porous transport layers are performed to understand the origin of the inductive feature and its interplay with mass transport related processes. Our findings reveal a significant impact of current density and voltage, temperature and membrane thickness on the inductive loop. Measurements via reference electrodes show a stronger correlation to the anode. Mass transport losses and the inductive loops are occurring in similar frequency ranges. Such overlapping of both effects with apparently positive and negative resistances can result in compensation in the spectra. The size of the inductive loops, which might even exceed the capacitive polarization resistance, and their dependence on the membrane thickness indicate that processes in the membrane are responsible for the observed behavior.
KW - Distribution of relaxation times
KW - EIS
KW - Inductive loops
KW - Low frequency
KW - Negative polarization resistance
KW - PEM electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85203159081&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2024.235375
DO - 10.1016/j.jpowsour.2024.235375
M3 - Article
AN - SCOPUS:85203159081
VL - 622
JO - Journal of power sources
JF - Journal of power sources
SN - 0378-7753
M1 - 235375
ER -