Fig. 9
From: Supercapacitors with alternating current line-filtering performance
Reproduced with permission from Ref [75]. Copyright 2015. The Royal Society of Chemistry
a SEM image of carbon sponges with 1% SDS surfactant; b comparison of the frequency response of an S-3-based supercapacitor with that of the AEC and activated carbon-based supercapacitors; c frequency-dependent specific capacitance; and d real and imaginary parts of the capacitance of the S-3-based supercapacitor.