Capacitance in carbon pores of 0.7 to 15 nm: a regular pattern

Abstract

The study of 28 porous carbons shows that the specific capacitance in the electrolyte (C(2)H(5))(4)NBF(4)/acetonitrile is relatively constant between 0.7 and 15 nm (0.094 ± 0.011 F m(-2)). The increase in pores below 1 nm and the lower values between 1 and 2 nm reported earlier are not observed in the present work.

The volumetric capacitance of microporous carbons in organic electrolyte

“…In the present case, we choose the capacitance of 0.094 F m -2 , which has been reported recently [16,17]. It also corresponds to values around 0.08 to 0.10 F m -2 obtained for mesoporous carbons [18,19].…”

“…On the other hand, the use of S BET suggests an increase in C/S as the average pore width decreases [9,10,11,16,17]. However, if this was the case, one should observe a change in the slope of (pores below 1 nm).…”

“…in pores below 1 nm (due to ions desolvation) is used as criteria for the improvement of the gravimetric capacitance [9][10][11][12][13][14][15][16][17].…”

“…It is equal to the value of 0.094 ± 0.011 F m -2 obtained earlier by considering the average total surface area S av of microporous and mesoporous carbons [16].…”

Mechanochemical synthesis of carbon-based nanocomposites for supercapacitors

“…According to data reported earlier [31] the specific surface capacitance (C) of carbon materials does not depend on the average pore size and the type of carbon material. In this case the C value should increase proportionally to the specific surface area [32]:…”