Abstract
Mesoporous nickel hydroxides Ni(OH)2/graphene nanohybrids were fabricated via heteroassembly of oppositely charged exfoliated Ni(OH)2 and graphite oxide (GO) nanosheets in formamide. The resulting hybrids exhibited a hierarchically porous networks composed of Ni(OH)2 and reduced graphite oxide (rGO) nanosheets. When the atomic ratio of Ni to C in hybrids was optimized to be 0.63, the resulting hybrids exhibited a specific capacitance of 1488F/g at a scan rate of 1mV/s with an excellent cycling stability. Originating from their heterogeneous compositions and hierarchically porous structures, almost all of their Faradic capacitance and non-Faradic capacitance could be employed. The rationally designed Ni(OH)2/rGO nanohybrids with completely engineered interface were used as cathode for asymmetric supercapacitors (ASCs). Optimized Ni(OH)2/rGO//AC ASC exhibited a high capacitance of 102.3F/g. Therefore, a high energy density of 36.7 Wh/Kg and power density of 7.98KW/Kg have been realized. Hence the present Ni(OH)2/rGO hybrids should be promising candidates as high-performance supercapacitors for energy storage and conversion.
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