TY  - JOUR
AU  - Reshetenko, Tatyana
AU  - Kulikovsky, Andrei
TI  - Understanding the distribution of relaxation times of a low–Pt PEM fuel cell
JO  - Electrochimica acta
VL  - 391
SN  - 0013-4686
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2021-03814
SP  - 138954 -
PY  - 2021
AB  - Distribution of relaxation times (DRT) is calculated from fifty local impedance spectra of a low–Pt PEM fuel cell. 48 out of 50 DRT spectra contain three peaks. Evolution of the peak frequency positions and resistivities with the cell current density are analyzed. The analysis allows us to attribute the low–frequency peak to oxygen transport in the gas–diffusion layer (perhaps, including transport in the channel), the middle peak to unresolved processes of charge–transfer and oxygen transport in the ionomer film, and the high-frequency peak to oxygen transport in void pores of the catalyst layer. Comparison of DRT spectra of low–Pt and high–Pt cells suggests a method for measuring ionomer film transport resistivity in a low–Pt cell.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1016/j.electacta.2021.138954
UR  - https://juser.fz-juelich.de/record/897481
ER  -