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Ni(OH) 2 /reduced graphene oxide (RGO) core-shell hybrid nanostructure has been synthesized employing a facile and inexpensive chemical-precipitation technique. The synthesized core-shell nanostructures, comprising Ni(OH) 2  at the core and RGO as shell, were then coated on commercially available Ni foam used as an electrode. Prepared Ni(OH) 2 /RGO nanospheres were analyzed by Raman analysis for structural information. In the Raman spectrum, the peaks at 1323 and 1612 cm −1  correspond to the D and G bands of RGO, respectively. The peaks at 468 and 335 cm −1  depict the characteristic bands of Ni(OH) 2  . The core-shell morphology of the hybrid was established from Transmission Electron Microscope (TEM) images. The lattice fringes are measured to be 0.33 nm for RGO layers and 0.22 nm for Ni(OH) 2  core, which correspond to (002) plane of RGO and (101) plane of Ni(OH) 2 . For electrochemical studies, the as-prepared Ni(OH)2/RGO hybrid was used as a battery-type electrode in supercapacitor. The results indicate that the Ni(OH) 2 /RGO core-shell hybrid nanostructure exhibits a maximum specific capacity of 513.8 Cg −1  at 10 mV/s with a maximum energy density of 119.4 Whkg −1  at 1250 Wkg −1  power density.

Electrochemical performance of binder-free Ni(OH) 2 /RGO battery type electrode materials for supercapacitor