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In this work, the asymmetric supercapacitor in which spherical porous VN is used as a negative electrode and NiO x as a positive electrode was assembled in 1M KOH aqueous electrolyte. The spherical porous VN negative material has a specific capacitance of 580F/g and the NiO x positive electrode a specific capacitance of 680F/g. The VN/NiO x symmetric supercapacitor shows a...
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