Vertically aligned ZnO nanorod core-polypyrrole conducting polymer sheath and nanotube arrays for electrochemical supercapacitor energy storage

Nanoscale Research Letters

Table 3 The Z″ parameter calculated from the simulated exponent p and CPE Q values and the measured Z″ values

Nanostructure electrode	Simulated $Z''_{{CPE}_{nr}} mhos . {cm}^{- 2} s^{- p}$	Measured $Z''_{{CPE}_{nr}} mhos . {cm}^{- 2} s^{- p}$	Percentage deviation
ZnO nanorod core-PPy sheath	11.8	7.7	34.7
Narrow PPy nanotube (2-h etch)	11.2	7.15	36.1
Open PPy nanotube (4-h etch)	9.59	6.50	32.2