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Typical SEM images of 3D pillared vertically aligned CNT (VACNT)-graphene architectures without (a,b) and with Ni(OH)2 (c,d). Electrochemical impedance spectra (EIS) Nyquist plots of VACNT-graphene electrode before (e) and after (f) modification by Ni(OH)2. CV at different scan rates (g) and GCD curves at various discharge current densities (h) (Reproduced with permission of [59]. Copyright American Chemical Society, 2011).
