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The first three cyclic voltammogram curves and the galvanostatic discharge-charge profiles ZnO-NiO solid (a,d), yolk-shell (b,e) and hollow (c,f) hybrid microspheres. (g) The discharge capacities and the corresponding Coulombic efficiencies of ZnO-NiO solid, yolk-shell and hollow hybrid microspheres at 100 mA g−1. (h) The rate capabilities of ZnO-NiO yolk-shell hybrid microspheres at different current densities.
