Abstract:
In this work, Nickel-doped Chromium Molybdates were synthesized by a convenient, cost-effective, and
good-yield co-precipitation process for supercapacitor electrodes. Morphological and structural
characterizations of materials were carried out by using scanning electron microscopy (SEM), energy
dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Raman spectroscopy. The electrochemical
performance was evaluated by performing cyclic voltammetry, galvanostatic charge-discharge, and
electrochemical impedance spectroscopy. Based on the synergistic effect of both Ni (II) and Cr (III) ions,
specific capacitance increases with the doping of nickel until the parent lattice structure is maintained. The
material with a nickel dopant concentration of 0.15 delivered the highest specific capacitance of 1572 F/g at
1 A/g among all other materials, good cyclic stability, and 100% coulombic efficiency. Moreover, the
detailed kinetic analyses suggested that the dominance of the diffusion-controlled charge storage mechanism
is responsible for the high specific capacitance of the materials. The present study demonstrated the traits of
materials as potential anodes for designing high-performance asymmetric supercapacitors and also provided
new insights for the development of high-performance materials for supercapacitors by using simple
synthetic approach.
