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Which mechanism limits the maximum energy storage capacity of a supercapacitor?

A)Electrolyte decomposition at high voltage
B)Increased resistance from electrode oxidation
C)Reduced capacitance from surface contamination
D)Decreased ion mobility at low temperature

💡 Explanation

When voltage increases,electrolyte decomposition happens because it exceeds the electrochemical stability window of the electrolyte leading to gas formation/resistance increase hence it limits energy storage. Therefore Electrolyte decomposition results rather than oxidation, contamination, or reduced mobility which require different chemical/physical conditions.

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