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. 2021 May 8;21(9):3259. doi: 10.3390/s21093259

Figure 5.

Figure 5

The equivalent capacitor consists of one plate with a electrode surface and the other plate with double layers of inner Helmholtz plane and outer Helmholtz plane at the conductor-solution interface. Specifically adsorbed molecules or ions (anions in this case) are acting as the dielectric, which no charge is permitted to transfer across.