Effect of temperature on pseudocapacitance performance of carbon fiber@NiCo2O4@Ni(OH)2 core–shell nanowire array composite electrodes

Abstract

The composite supercapacitor electrodes are fabricated by facile electrochemical deposition of Ni(OH)2 nanosheets on NiCo2O4 nanowire arrays which are grown radially on carbon fiber. The composite electrodes offer specific capacitance of 2400F/g at 1mA/cm2, excellent rate capability of 89% as the current density increasing from 1 to 20mA/cm2. Electrochemical performances are investigated at different temperatures from 0°C to 60°C. The specific capacitance at 1mA/cm2 increases from 2100F/g at 0°C to 3000F/g at 60°C. The mechanisms of effect of temperature on the electrochemical properties of the composite electrode are investigated. This study provides a fundamental comprehension of the temperature dependent of composite electrodes.