
178 Electrochemically Enabled Sustainability
prole of the HMC and NAS carbon between 0 and 2.5 V potential window
at 0.3 A g
−1
current density. A high specic capacitance value of 162 F g
−1
was
measured for the HMC capsules from a linear t of the discharge curve. It
can be seen that the charge–discharge behaviour of the HMC shows almost
linear variation of voltage with time as in ideal shown by electrical dou-
ble layer capacitor. This high specic capacitance is attributed to the large
active surface area of the HMC electrode. Most of the active surface area of
the HMC electrode could be accessed by organic electrolyte ions due to the
large ...