Abstract A facile sol-gel route is developed to build mesoporous 3D NiCo2O4/MWCNT nanocomposite aerogels. The crystal structure, surface morphology and electrochemical performance of the aerogel composites are investigated by X-ray… Click to show full abstract
Abstract A facile sol-gel route is developed to build mesoporous 3D NiCo2O4/MWCNT nanocomposite aerogels. The crystal structure, surface morphology and electrochemical performance of the aerogel composites are investigated by X-ray diffraction (XRD), Field-emission scanning electrochemical spectroscopy (FE-SEM) and electrochemical measurements. The effects of MWCNT concentration on the capacitance performance of MWCNT/NiCo2O4 aerogels are studied. It is found that the NiCo2O4/MWCNT nanocomposite aerogels with MWCNTs ∼ 2.1 wt% reach the maximum specific capacitance of up to 1010 F g−1 at a discharge current density of 0.1 A g−1 with excellent cyclic stability. Further, these materials are applied for solid-state asymmetric supercapacitors and show higher areal capacitance value (471.8 mF cm−2) at a current density of 5 mA cm−2 with good cycle stability and glowing red LED for 3mins. The superior electrochemical performance is due to the mesoporous structure and well-connected metal nanoparticles with MWCNT in the nanocomposite aerogels, which can provide more active sites to enhance the electrochemical performance of the device.
               
Click one of the above tabs to view related content.