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Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm 0.5 Sr 0.5 CoO 3 (SSC) as SOFC cathode. From the P O2 dependence of interfacial conductivity, the rate determining step of dense SSC electrode was adsorption and desorption processes at the surface of the electrode. Rate constants of adsorption and desorption...
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