%0 Edma 0-6
%A Kulikovsky, Andrei
%I Elsevier
%D 2014
%C New York, NY u.a.
%R 10.1016/j.jelechem.2014.03.005
%T A simple equation for in situ measurement of the catalyst layer Oxygen diffusivity in PEM fuel cell
%J Journal of electroanalytical chemistry
%V 720-721
%N 214
%P 47-51
%@ 1572-6657
%U http://juser.fz-juelich.de/record/141679
%X We report a method for in situ determination of the oxygen diffusion coefficient D in the cathode catalyst layer (CCL) of a PEM fuel cell. The method is based on our recent model equation for the CCL polarization potential. Two low-current impedance spectra of the CCL should be measured for the same cell current and different oxygen concentrations. We show that D is given by D=(k-1)blt/(k12FδRcclc)D=(k-1)blt/(k12FδRcclc), where b is the Tafel slope, ltlt is the CCL thickness, δRcclδRccl is the difference of the low-frequency CCL resistivities, c is the smallest oxygen concentration used in experiments, and k>1k>1 is the ratio of two concentrations.
%~ JuLib eXtended
%W Forschungszentrum Jülich GmbH, Zentralbibliothek