Details
| Original language | English |
|---|---|
| Article number | 696 |
| Journal | Membranes |
| Volume | 11 |
| Issue number | 9 |
| Publication status | Published - 9 Sept 2021 |
Abstract
Proton exchange membrane water electrolysis cells are typically operated with high water flow rates in order to guarantee the feed supply for the reaction, the hydration of the ionomer phase and to homogenize the temperature distribution. However, the influence of low flow rates on the cell behavior and the cell performance cannot be fully explained. In this work, we developed a simple 1+1-dimensional mathematical model to analyze the cell polarization, current density distribution and the water flow paths inside a cell under low stoichiometry condition. The model analysis is in strong context to previous experimental findings on low water stoichiometry operations. The presented analysis shows that the low water stoichiometry can lead to dry-out at the outlet region of the anode channel, while a water splitting reaction is also present there. The simulation results show that the supply with water in this region is achieved by a net water transport from the cathode to the anode catalyst layer resulting in higher local proton resistances in the membrane and the anode catalyst layer.
Keywords
- 1+1-dimensional modeling, Current density distribution, Low stoichiometry operation, Proton exchange membrane water electrolysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Chemical Engineering (miscellaneous)
- Chemical Engineering(all)
- Process Chemistry and Technology
- Chemical Engineering(all)
- Filtration and Separation
Sustainable Development Goals
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Membranes, Vol. 11, No. 9, 696, 09.09.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Model-based analysis of low stoichiometry operation in proton exchange membrane water electrolysis
AU - Immerz, Christoph
AU - Bensmann, Boris
AU - Hanke-Rauschenbach, Richard
N1 - Funding Information: Funding: The authors gratefully acknowledge the financial support by the Federal Ministry of Education and Research of Germany in the framework of PowerMem (project number 03EW0012B).
PY - 2021/9/9
Y1 - 2021/9/9
N2 - Proton exchange membrane water electrolysis cells are typically operated with high water flow rates in order to guarantee the feed supply for the reaction, the hydration of the ionomer phase and to homogenize the temperature distribution. However, the influence of low flow rates on the cell behavior and the cell performance cannot be fully explained. In this work, we developed a simple 1+1-dimensional mathematical model to analyze the cell polarization, current density distribution and the water flow paths inside a cell under low stoichiometry condition. The model analysis is in strong context to previous experimental findings on low water stoichiometry operations. The presented analysis shows that the low water stoichiometry can lead to dry-out at the outlet region of the anode channel, while a water splitting reaction is also present there. The simulation results show that the supply with water in this region is achieved by a net water transport from the cathode to the anode catalyst layer resulting in higher local proton resistances in the membrane and the anode catalyst layer.
AB - Proton exchange membrane water electrolysis cells are typically operated with high water flow rates in order to guarantee the feed supply for the reaction, the hydration of the ionomer phase and to homogenize the temperature distribution. However, the influence of low flow rates on the cell behavior and the cell performance cannot be fully explained. In this work, we developed a simple 1+1-dimensional mathematical model to analyze the cell polarization, current density distribution and the water flow paths inside a cell under low stoichiometry condition. The model analysis is in strong context to previous experimental findings on low water stoichiometry operations. The presented analysis shows that the low water stoichiometry can lead to dry-out at the outlet region of the anode channel, while a water splitting reaction is also present there. The simulation results show that the supply with water in this region is achieved by a net water transport from the cathode to the anode catalyst layer resulting in higher local proton resistances in the membrane and the anode catalyst layer.
KW - 1+1-dimensional modeling
KW - Current density distribution
KW - Low stoichiometry operation
KW - Proton exchange membrane water electrolysis
UR - http://www.scopus.com/inward/record.url?scp=85115123884&partnerID=8YFLogxK
U2 - 10.3390/membranes11090696
DO - 10.3390/membranes11090696
M3 - Article
AN - SCOPUS:85115123884
VL - 11
JO - Membranes
JF - Membranes
IS - 9
M1 - 696
ER -