This title appears in the Scientific Report : 2014 

A simple equation for in situ measurement of the catalyst layer Oxygen diffusivity in PEM fuel cell
Kulikovsky, Andrei (Corresponding author)
Elektrochemische Verfahrenstechnik; IEK-3
Journal of electroanalytical chemistry, 720-721 (2014) 214, S. 47-51
New York, NY [u.a.] Elsevier 2014
10.1016/j.jelechem.2014.03.005
Journal Article
Fuel Cells
Please use the identifier: http://dx.doi.org/10.1016/j.jelechem.2014.03.005 in citations.
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.