Which mechanism limits the maximum power output of a solid oxide fuel cell at high current densities?

💡 Explanation

At high current densities, reactants are consumed faster than they can be replenished at the electrode surface, leading to concentration polarization, because the Nernst potential shifts negatively, reducing the cell voltage and ultimately limiting power. Therefore, concentration polarization limits power rather than ohmic resistance, activation losses, or thermal effects being dominant at those ranges.

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