In Situ Growth of the Ni₃V₂O₈@PANI Composite Electrode for Flexible and Transparent Symmetric Supercapacitors

Because of the poor specific capacitance of transparent and flexible supercapacitors reported recently, exploring electrode materials with high electrochemical properties for such devices is still a big challenge. We reported that the Ni3V2O8@PANI composite has been synthesized using an in situ chemical bath method. It was found that the synthesized Ni3V2O8@PANI composite has outstanding electrochemical behaviors (specific capacitance value of 2565.7 F/g at 5 mV/s, wide potential window, good rate capability), which are much superior to those of Ni3V2O8 and PANI electrodes. The improved electrochemical behaviors result from the synergistic effect between Ni3V2O8 and PANI. A symmetric flexible and transparent supercapacitor was fabricated using the Ni3V2O8@PANI composite as the working electrode. The device demonstrated a maximum areal capacitance of 58.5 mF/cm2 at 5 mV/s and an energy density of 20.8 μW h/cm2 with 1.6 V potential window. Furthermore, the capacitance retained nearly 88% of its original value after 20 000 galvanostatic charging and discharging cycles. These results favor the promising potential of the Ni3V2O8@PANI composite as the electrode material for the application in flexible and transparent supercapacitors.