Research Article

The Capacitive Behaviors of Manganese Dioxide Thin-Film Electrochemical Capacitor Prototypes

Table 2

Specific capacitance (F/g) of MnO2-based electrochemical capacitors in different aqueous electrolytes calculated from cyclic voltammograms (CVs) at scan rate of 50 mV/s and electrochemical impedance spectroscopy (EIS) at the frequency of 10 mHz.

Cations [0.2 M]Mobility
(10−8 m2s−1V) [29]
Conductivity
(10−4 m2 S mol−1) [29]
Radius of hydrated cations (~Å) [25]Specific capacitance from CV (F/g)Specific capacitance from EIS (F/g)

NANA3.32354330
K+7.673.53.32308306
Na+ (in Na2SO4)5.250.13.59325303
Na+ (in NaCl)5.250.13.59309316
Li+4.038.73.84253274
Mg2+NANA4.28436390
Zn2+NANA4.32305NA