Hydrothermally produced nio for supercapacitorelectrodes

The metal oxide materials have been used as supercapacitor electroactive materials. Among them, the highest electrochemical performance was shown by RuO2 and then NiO. However, RuO2 is a very expensive material. NiO has been widely used a material in catalysis, gas sensing, semiconductors, and energy storage supercapacitors. In this study, nickel oxide/hydroxide nanopowders and with various morphologies have been produced by the hydrothermal process. In addition, three-dimensional nanostructured nickel oxide materials have synthesized on Ni foam. The crystalline phases and sizes of synthesized materials were determined by XRD. After heat treatment at 300 C, an increase in surface area was observed. The electrochemical properties are also studied by cyclic voltammetry, charge-discharge tests and also electrochemical impedance spectroscopy. NiO nanostructured powder and 3D NiO nanostructures on Ni foam were used to construct supercapacitor electrode whose specific capacitances are measured 357 F/g and 430 F/g, respectively. The 3D Nickel oxide/Ni foam electrode with nanoflakes and nanoparicles is manufactured without the need for any binder, or conductivity enhancer, which is technologically very important. In addition, different proportions of Mn were added and its effects on the electrochemical performance of the Ni based electrodes were also investigated.