Discussion
A supercapacitor stores energy
Answer: B
Correct answer: as charge separated at an electrode surface
A supercapacitor stores charge physically, in the electrical double layer that forms at the interface between a very high area electrode and the electrolyte. Because no chemical reaction is involved, charge and discharge are almost instantaneous and the device withstands hundreds of thousands of cycles - but the energy stored, \( \tfrac{1}{2}CV^2 \), is small compared with a battery of the same size.
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