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Fig. 2 | BMC Materials

Fig. 2

From: Supercapacitors with alternating current line-filtering performance

Fig. 2

Reproduced with permission from Ref [9]. Copyright 2012. Macmillan Publishers Limited

a Scanning electron microscope (SEM) micrograph vertical aligned graphene on the Ni surface; b impedance phase angle versus the frequency for a graphene nanosheet-based capacitor, commercial aluminum electrolytic capacitor, and activated carbon-based capacitor; c capacitance versus the frequency of the graphene nanosheet capacitor; Reproduced with permission from Ref [12]. Copyright 2019. AAAS. d cross-sectional SEM image of the ErGO electrode; e plot of the impedance phase angle versus the frequency; and f plot of specific capacitance versus the frequency.

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