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초록

This paper describes the hydrothermal synthesis of Ni3V2O8 nanoparticles for supercapacitor and hydrogen evolution study. The surface microstructure of Ni3V2O8 nanoparticles reveals an excellent areal-specific capac-itance of 1.09 F cm-2 at a current density of 1 mA cm-2 and an energy density of 24 mWh cm-2 at a power density of 200 mW cm-2. In addition to supercapacitor performance, the Ni3V2O8 electrode revels well in hydrogen evolution reaction in 1 M KOH electrolyte. The Ni3V2O8 electrode exhibits a 175 mV over potential at 10 mA cm-2 current density and a 154 deg/mV Tafel slope before stabilization. According to the electrochemical impedance spectroscopy, the series resistance (Rs) is 3.89 omega and the charge transfer resistance (Rct) is 5.62 omega. The series resistance of the Ni3V2O8 electrode is the same, but Rct climbs to 6.45 omega after 5 h of stability.

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