Template and binder free 1D cobalt nickel hydrogen phosphate electrode materials for supercapacitor application

Herein, we synthesized 1D bimetallic hydrogen phosphate [Co
Ni(HPO)]nanorods by using a simple and effectivechemical bath deposition method for supercapacitor applications. The prepared CoNi(HPO) was analyzed by Fouriertransform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD) pattern. The surface morphology was envisaged byscanning electron microscopy (SEM) and transmission electron microscopy (TEM) methods. The porous nature andsurface area of the materials were characterized by nitrogen sorption isotherm and a high specific surface area of153 mg was found to be for Co
Ni(HPO). The CoNi(HPO) displays a maximum specific capacity of475 mA h gat 1 A g in a three-electrode configuration using 3 M KOH as the electrolyte. CoNi(HPO) exhibitsalmost 94.8% of its initial specific capacity over 5000 GCD cycles at 10 A g. Furthermore, the fabricated symmetricsupercapacitor (ASC) with CoNi(HPO) and activated carbon (AC) showed a high specific capacitance of 182.5Fg
at 0.5 A g. The ASC device delivered a maximum energy density of 64.88 Wh kg at a power density of800 W kg.