Abstract
Nickel manganate/reduced graphene oxide (NiMn2O4/rGO) composites were synthesized by a hydrothermal method. The morphology, specific surface area and capacitance performance were influenced by the type of solvent. The NiMn2O4/rGO synthesized with deionized water as solvent has nanosheets structure, the specific capacitance of NiMn2O4/rGO nanosheets is 1360 F g−1 at 1 A g−1. The NiMn2O4/rGO synthesized with anhydrous ethanol as solvent has a nanoflower structure, the specific capacitance of NiMn2O4/rGO nanoflowers is 1692 F g−1 at 1 A g−1. After 5000 cycles, the specific capacitance retention rate of NiMn2O4/rGO nanoflowers is 81% at 5 A g−1, that of NiMn2O4/rGO nanosheets is 90%. NiMn2O4/rGO nanoflowers prepared with ethanol as solvent shows superior specific capacitance; NiMn2O4/rGO nanosheets prepared with deionized water as solvent has good rate performance and cycling stability.
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