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The carbon nanotubes attached mesoporous Ag3O4-coated NiO nanosheets were prepared successfully through hydrothermal method. The structural, morphological and electrochemical properties of the prepared nanocomposite have been studied. The X-ray diffraction and Raman analysis confirms the presence of NiO, Ag3O4 and carbon nanotubes in the prepared sample. HRTEM images clearly show the coating of Ag3O4 on the NiO and attachment of carbon nanotubes. BET surface area analysis confirms the mesoporous nature of the prepared composite. The cyclic voltammetric (CV), galvanostatic charge-discharge (GCD) and impedance analysis were made to explore the electrochemical nature of the composite. Cyclic voltammograms reveals the maximum specific capacity of 415.86 mAh g−1 at the scan rate of 3 mV s−1 and GCD analysis exhibits the specific capacity of 416.63 mAh g−1 at 1 A g−1. The prepared nanocomposite retained 97% of maximum capacity even after 1500 cycles. [ABSTRACT FROM AUTHOR]

The three-dimensional (3D) floral-shaped V2O5was directly grown on Ni foam backbones by a straightforward and additive free hydrothermal approach. The as-synthesised material can be directly investigated as electrodes for supercapacitors without inclusion of other additives, such as polymer binder and carbon black. These elegant structural features endow this material with superior electrochemical features, such as high capacitance (601 Fg−1), superior withstanding capacity at higher rates (373 Fg−1at 5 Ag−1) and better cyclic stability. Most importantly, the symmetric supercapacitor using 3D-V2O5at Ni foam electrode exhibits specific capacitance of 142 Fg−1with energy density of 29 WhKg−1. Thirty light-emitting diodes were illuminated using three (connected in series) 3D-VN symmetric supercapacitors. Such impressive morphology and electrochemical richness of this material encourages its usefulness as supercapacitor electrodes. [ABSTRACT FROM PUBLISHER]