Figure 6 | Scientific Reports

Figure 6

From: Fabrication of hierarchical core/shell MgCo2O4@MnO2 nanowall arrays on Ni-foam as high–rate electrodes for asymmetric supercapacitors

Figure 6

Electrochemical characterizations of MgCo2O4@MnO2 core-shell nanowall arrays. (a) Cyclic voltammetry (CV) curves of MCNA, MCMNA-1, MCMNA-2 and MCMNA-3 at 20 mV s−1. (b) Galvanostatic charge-discharge (GCD) curves of MCNA, MCMNA-1, MCMNA-2 and MCMNA-3 with 1 A g−1 at 0.5 V. (c) Cyclic voltammetry (CV) curves of the MCMNA-2 at the different scan rates from 5 to 80 mV s−1. (d) Galvanostatic charge-discharge (GCD) curves of MCMNA-2 at different current densities from 1 to 40 mA g−1. (e) The specific capacity of the MCMNA-2 and MCNA electrodes as a function of current density. (f) Nyquist plots of the MgCo2O4 nanoneedle arrays/Ni-foam electrode before and after 2000 cycles at the open circuit potential. Inset is the typical 10 cycles with 10 A g−1 at 0.5 V.

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