Poly(pentafluorstyrene) based ionomers for electrochemical hydrogen pumps II – Probing the electrode processes by distribution of relaxation times
Braig M, Cho H, Marchfelder C, Atanasov V, Zeis R (2026)
Publication Type: Journal article
Publication year: 2026
Journal
Book Volume: 202
Article Number: 152881
DOI: 10.1016/j.ijhydene.2025.152881
Abstract
The properties of different poly (pentafluorstyrene) (PPFSt) based ionomers implemented into full-cell electrochemical hydrogen pumps (EHPs) are investigated by electrochemical impedance spectroscopy (EIS) coupled with the distribution of relaxation times (DRT) analysis. Thereby, the resistances of the proton transport (PT) in the electrodes, the hydrogen evolution reaction (HER) on the cathode, the hydrogen oxidation reaction (HOR) on the anode, and the mass transport (MT) in each EHP are quantified. Phosphonated PPFSt (PWN70) ionomer exhibits superior performance with a polybenzimidazole membrane, demonstrating excellent PT and kinetics. A novel PPFSt ionomer functionalized with an imidazole group also outperforms commonly utilized PTFE binder by improving the PT and the HER, reducing the power consumption by 25 % at 1.0 A cm−2 and 200 °C. Both ionomers demonstrate a MT resistance comparable to the PTFE catalyst layer, caused by the high porosity of PWN70 and the high hydrophobicity of the imidazole binder.
Authors with CRIS profile
Involved external institutions
Universität Stuttgart
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Helmholtz Institut Ulm
Germany (DE)
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
Helmholtz Institut Ulm
Germany (DE)
How to cite
APA:
Braig, M., Cho, H., Marchfelder, C., Atanasov, V., & Zeis, R. (2026). Poly(pentafluorstyrene) based ionomers for electrochemical hydrogen pumps II – Probing the electrode processes by distribution of relaxation times. International Journal of Hydrogen Energy, 202. https://doi.org/10.1016/j.ijhydene.2025.152881
MLA:
Braig, Michael, et al. "Poly(pentafluorstyrene) based ionomers for electrochemical hydrogen pumps II – Probing the electrode processes by distribution of relaxation times." International Journal of Hydrogen Energy 202 (2026).
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