149
Components and Materials for Electrochemical Supercapacitors
200
180
160
140
120
100
80
60
40
20
0
C DL
C AQ
C total
C/F g
–1
0
2
4
6
8
10
12
14
Mass Percentage of Grafted AQ
225
200
175
150
125
C/F g
–1
100
75
50
25
0
BP
BP 9
BP 8
0
2 0
40
6 0
80
100
Scan Rate/mV s
–1
FIGURE 4.7
Top: Plot of total capacitance, AQ capacitance, and EDLC capacitance of modified AC cloth as
function of AQ loading. Bottom: Persistence of total capacitance for CV at increasing scan rates
where BP, BP 8, and BP9 represent 0 wt%, 11 wt%, and 14 wt%, respectively. (Source: Pognon, G.
et al. 2011. Journal of Power Sources, 196, 4117–4122. With permission.)
maintains around 75% of its capacitance with 11 wt% AQ loading [24]; see
Figure 4.7, top.
In addition to the large remaining EDLC component, a pseudocapacitive
component is introduced by the functionality that almost doubles the overall capacitance at both low scan rate (10 mV.s –1 ) and at faster scan rates (100