Abstract
The effects of cathodic DC bias, bulk Po 2 and effective O 2 -diffusivity on AC impedance spectrum of SWPC's cathode-supported SOFCs were studied over a temperature range of 800 to 1000°C. It was found that the activation process, identified as ionic transfer and O - surface diffusion, dominated the overall electrode kinetics at 800°C. The applied DC bias reduced the electrode resistance considerably. With increasing the temperature to above 900°C, the activation process became effectively activated, leading to a visible contribution of the pore gas-diffusion at the lowest frequency on the impedance spectrum. Under this circumstance, lower bulk Po 2 and lower effective O 2 -diffusivity increase pore gas-diffusion polarization as predicted by the gas-diffusion theory. DC bias also increased gas-diffusion as a result of increased DC current. At any circumstance, no pore gas-diffusion was found in pure O 2 atmosphere.
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