Electrical Double Layer based devices

Immersing a metal (electrode) in a salt solution will spontaneously accumulate ions due to image charge to form the well known electrical double layer (EDL). Sign of the charge depends on the Fermi level (i.e., the electrochemical potential) difference between the metal and the solution. For example, gold will accumulate negative ions (i.e., anions). The interfacial structure

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Ultrahigh-power electrochemical double-layer capacitors based on structurally integrated 3D carbon tube arrays

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Electrical double layer theory