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.

• Which outcome occurs when a Carnot heat engine operates with its hot reservoir cooled below design temperature?
• Which outcome results when an amplifier circuit experiences thermal runaway?
• Which outcome occurs when a non-ideal catalyst contaminates a chemical reactor?
• Which outcome occurs when amorphous silicon in solar panel is heated above glass transition temperature?
• Which artifact impairs image quality in optical metrology systems that use holographic interferometry?
• What outcome arises when a magnetic recording head experiences excessive fringing?