High performance symmetric supercapacitor based on zinc hydroxychloride nanosheets and 3D graphene-nickel foam composite

The fabricated symmetric supercapacitor based on NiF-G/ZHCNs as the negative and positive electrodes exhibited a specific areal capacitance of 222 mF cm−2 at 1.0 mA cm−2 and 96% specific capacitance retention after 5000 cycles. These results showed that electrical and ionic conductivities of the NiF-G/ZHCNs are suitable for symmetric supercapacitor application.