Double-layer capacitance refers to the electric charge storage mechanism that occurs at the interface between an electrode and an electrolyte in electrochemical systems. It arises due to the separation of charges at this interface, forming two layers of charge: one on the electrode surface and one in the electrolyte, which creates an electric double layer. This phenomenon is crucial for understanding energy storage in supercapacitors, where the capacitance significantly affects performance and efficiency.
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