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V. Brichzin, J. Fleig, H.-U. Habermeier, J. Maier:
"Geometry Dependence of Cathode Polarization in Solid Oxide Fuel Cells Investigated by Defined Sr-Doped LaMnO₃ Microelectrodes";
Electrochemical and Solid State Letters, 3 (2000), S. 403 - 406.

Microcontact impedance spectroscopy was used to measure the electrode polarization resistance of geometrically defined, thin, circular (La0.8Sr0.2)0.92MnO3 (LSM) microelectrodes deposited on yttria-stabilized zirconia (YSZ) as a function of the electrode diameter (~20-200 µm). The electrode polarization resistance is proportional to the inverse of the square of the electrode diameter. This clear result indicates a rate-determining step of the oxygen reduction that is connected with the electrode area rather than depending on the length of the three-phase boundary LSM, O2/YSZ.

http://dx.doi.org/10.1149/1.1391160