Which process limits maximum achievable power output from a fuel cell at high current densities?

💡 Explanation

When current density is high in a fuel cell, the activation energy for the electrochemical reactions at the electrode surfaces becomes a limiting factor because the rate of reaction cannot keep up with the demand, causing significant voltage drop. Therefore, activation energy polarization dominates, rather than other listed options which require different conditions like inadequate heat removal or liquid water imbalance.

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• Which optical consequence results when tolerances induce surface variations during multi-layer microchip fabrication?
• Which consequence results when contaminants exist on interferometer mirrors?