Figure 6.

Supercapacitance properties of graphene-ZnO hybrid in all-solid supercapacitors. (a) Fabricated solid-state supercapacitor device-based graphene-ZnO hybrid electrode. (b) CV curves of the graphene-ZnO hybrid electrode at different scan rates from 10 to 150 mV s−1. (c) Galvanostatic charge–discharge curves of the graphene-ZnO hybrid electrode at different current densities. (d) Variation of the specific capacitance of the graphene-ZnO hybrid electrode as a function of cycle number.

Li et al. Nanoscale Research Letters 2013 8:473   doi:10.1186/1556-276X-8-473
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