A solid-oxide fuel cell electrolyte has ASR = 0.20 O cm 2 at T = 726.85 C and ASR = 0.05 O cm 2 at T = 926.85 C. What is the activation energy (?G act ) for conduction in this electrolyte material? Consider a fuel cell operating at 80C. In the cathode, humidified air at 1 atm is supplied with a water vapor mole fraction of 0.2. If the fuel cell employs circular channels with a diameter of 1 mm, find the maximum tolerable air velocity that still ensures laminar flow.
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