Journal Article

FZJ-2018-03242

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Fractal diffusion in high temperature polymer electrolyte fuel cell membranes

Hopfenmüller, B.FZJ* ; Zorn, R. (Corresponding author)FZJ* ; Holderer, O.MLZ*FZJ* ; Ivanova, O.MLZ*FZJ* ; Lehnert, W.FZJ*RWTH* ; Lüke, W.FZJ* ; Ehlers, G. ; Jalarvo, N.FZJ* ; Schneider, G. J. ; Monkenbusch, M.FZJ* ; Richter, D.FZJ*

2018
American Institute of Physics Melville, NY

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/18805  doi:10.1063/1.5018717

Abstract: The performance of fuel cells depends largely on the proton diffusion in the proton conducting membrane, the core of a fuel cell. High temperature polymer electrolyte fuel cells are based on a polymer membrane swollen with phosphoric acid as the electrolyte, where proton conduction takes place. We studied the proton diffusion in such membranes with neutron scattering techniques which are especially sensitive to the proton contribution. Time of flight spectroscopy and backscattering spectroscopy have been combined to cover a broad dynamic range. In order to selectively observe the diffusion of protons potentially contributing to the ion conductivity, two samples were prepared, where in one of the samples the phosphoric acid was used with hydrogen replaced by deuterium. The scattering data from the two samples were subtracted in a suitable way after measurement. Thereby subdiffusive behavior of the proton diffusion has been observed and interpreted in terms of a model of fractal diffusion. For this purpose, a scattering function for fractal diffusion has been developed. The fractal diffusion dimension dw and the Hausdorff dimension df have been determined on the length scales covered in the neutron scattering experiments

Keyword(s): Energy (1st) ; Soft Condensed Matter (2nd) ; Materials Science (2nd)

---

Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Neutronenstreuung (Neutronenstreuung ; JCNS-1)
3. JCNS-SNS (JCNS-SNS)
4. Elektrochemische Verfahrenstechnik (IEK-3)
5. Streumethoden (JCNS-2)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)
2. 6215 - Soft Matter, Health and Life Sciences (POF3-621) (POF3-621)

Experiment(s):

1. SPHERES: Backscattering spectrometer (NL6S)

Appears in the scientific report 2018

---

Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---