TY  - JOUR
AU  - Kulikovsky, Andrei
TI  - PEM fuel cell distribution of relaxation times: a method for the calculation and behavior of an oxygen transport peak
JO  - Physical chemistry, chemical physics
VL  - 22
IS  - 34
SN  - 1463-9084
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2021-00838
SP  - 19131 - 19138
PY  - 2020
AB  - A simple numerical method for the calculation of the distribution of relaxation times (DRT) for PEM fuel cell impedance is developed. The method combines the Tikhonov regularization technique and projected gradient iterations. The method is illustrated by calculating DRT for the synthetic impedance of two parallel RC-circuits and for Warburg finite-length impedance. Finally, cathode catalyst layer (CCL) impedance is calculated using the exact analytical solution and the method discussed is applied to understand the behavior of the DRT peak due to oxygen transport in the CCL. The position of the oxygen transport peak on the frequency scale exhibits non-monotonic behavior as the oxygen diffusion coefficient in the CCL decreases, which may serve as an indicator of CCL flooding. The Python code for DRT calculation is available for download.
LB  - PUB:(DE-HGF)16
C6  - 32808947
UR  - <Go to ISI:>//WOS:000567772700032
DO  - DOI:10.1039/D0CP02094J
UR  - https://juser.fz-juelich.de/record/890254
ER  -