Figure 5.

Anomalous capacitance and mean-field model. (a) Model of a slit-shaped metallic pore as a part of a supercapacitor’s electrode. Slit width L is comparable to the ion diameter 2a = 2a_±. Potential difference u is applied to the pore walls with respect to bulk electrolyte. (b) Zero-voltage capacitance obtained by the mean-field model, eq 20, qualitatively agrees with Monte Carlo simulations⁴⁹ (see section 6) and experiments:²⁰ While the mean-field model overestimates the capacitance, it captures the anomalous capacitance increase. The plot has been created using the data from refs (20), (23), and (49).