guest ::
| Home > Publications database > Proton diffusion in the catalytic layer for high temperature polymer electrolyte fuel cells |
| Home > Publications database > Proton diffusion in the catalytic layer for high temperature polymer electrolyte fuel cells |
| Journal Article | FZJ-2019-05675 |
; ; ; ; ; ;
2019
RSC Publishing
London
This record in other databases: 
Please use a persistent id in citations: http://hdl.handle.net/2128/23572 doi:10.1039/c9ra06431a
Abstract: The present study focuses on quasielastic neutron scattering (QENS) of the proton dynamics in phosphoric acid (PA) inside the catalytic layer of high-temperature polymer electrolyte fuel cells (HT-PEFCs). The nanosecond proton dynamics is investigated on the local length scale around operating temperatures (300 K–430 K) using neutron backscattering spectroscopy. We have investigated the catalyst doped with different amounts of PA in order to understand the distribution of PA inside the layer. Three approaches are considered for the description of proton dynamics: the random jump diffusion model, distribution of diffusion constants and, finally, the trap model. Due to adsorption of the PA on the Pt particles the diffusion of protons in the catalytic layer is different in comparison to the bulk acid. The proton dynamics in the catalytic layer can be described by the random jump diffusion with traps. This diffusion is significantly slower than the diffusion of free PA; this also results in a lower conductivity, which is estimated from the obtained diffusion constant.
Keyword(s): Energy (1st) ; Materials Science (2nd) ; Soft Condensed Matter (2nd)
; 
; 
; 
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)