2.4 Electrochemical Measurement
The ZISCs were assembled with ZMOP cathode, PCNTs anode, and
ZnSO4 electrolyte. The diaphragm for assembling ZISCs
consisted of GF/D Whatman glass fibers. At the same time, the properties
of ZMOP//PCNTs ZISCs were evaluated using coin cells operating within
the range of 0 to 1.9 V. The preparation procedure for the ZMOP cathode
entails the following steps: initially, a mixture of ZMOP-x,
polytetrafluoroethylene, and acetylene black of 8:1:1 ( in a mass
ratio), which is thoroughly ground into an even paste-like consistency.
This is then rolled out to create a coating of identical thickness.
Next, the coating is dried for 24 h at 60°C and subsequently cut into a
round slice with a diameter of 1.6 cm. And then the approximate mass of
every piece is about 1.7-1.8 mg cm-2. Cyclic
voltammetry (CV) and electrochemical impedance spectroscopy (EIS)
assessments were conducted using CHI660E electrochemical workstation
(Chenhua, China). The EIS results were gathered over a frequency range
from 105 Hz to 0.01 Hz. Galvanostatic charging-discharging (GCD) data
were tested by a battery testing system (CT3002A, Land, China). The
energy density (E, Wh kg⁻¹) and power density (P, W kg⁻¹) for the ZISCs
were calculated using the equations (1)-(2),
E=\(\frac{I\times\int\text{V\ dt}}{3.6\ \times\text{\ m}}\)(1)
P=\(\frac{E}{t}\times 3600\) (2)
where I (A) signifies the current during the charging-discharging
process, V (V) denotes the voltage, m (g) indicates the
mass of the electrodes, and t (s) represents the discharging
time, respectively.