Abstract
In the present work, we report the high-performance supercapacitive behavior of NFO/PPy core–shell composite. The composite electrode was prepared by adopting simple and inexpensive in-situ chemical oxidation route in an aqueous medium containing sodium dodecyl sulfate (SDS) as a surfactant and characterized for the spectral, structural, electrical, thermal and morphological studies. The electrochemical properties were recognized by cyclic voltammetry, charge–discharge and electrochemical impedance spectroscopy. The supercapacitive performance of NFO/PPy electrode was studied in an aqueous 0.1N H2SO4 electrolyte solution. The effect of electrolyte concentration on specific capacitance and the stability of electrode were studied. The highest specific capacitance (Cs) achieved with NFO/PPy electrode was 721.66 Fg−1. The specific energy (Es), specific power (Ps) and coulomb efficiency (η%) were observed to be 51.95 Whkg−1, 6.18 kWkg−1 and 99.08% respectively. This electrode shows the outstanding electrochemical stability over 1000th continuous charging–discharging cycles and emerged as an efficient electrode material for energy storage devices as a supercapacitor.
Highlights
Supercapacitors act as transitional structures that link the energy gap between high power output and high energy-storage.1 They have high energy density, stability and high efficiency toward the charging and discharging cycles
Nickel ferrite (NFO) has spinel structure based on a face centered cubic lattice of the oxygen ions with the unit cell consisting of eight formula units
This is due to the presence of strong interaction of ferrite materials with pristine PPy chain
Summary
Supercapacitors act as transitional structures that link the energy gap between high power output and high energy-storage. They have high energy density, stability and high efficiency toward the charging and discharging cycles. Supercapacitors act as transitional structures that link the energy gap between high power output and high energy-storage.1 They have high energy density, stability and high efficiency toward the charging and discharging cycles. The tetrahedral sites (A) and the octahedral sites (B) are occupied by metallic cations in the unit cell.4 It is an inverse spinel ferrite having structural formula (Fe3+)[Ni2+Fe3+]O4. Since few decades, transition metal oxides and some ferrites have been used as favorable electrode materials for supercapacitor applications due their high specific capacitance. Bhojane et al. reported that the template free synthesis of NFO nanostructure electrode for supercapacitor with highest specific capacitance of 541 Fg−1 at the scan rate of 2mVs-1. The present work is focused on novel cost-effective synthesis of PPy with spinel ferromagnetic material such as nickel ferrite to form NFO/PPy core–shell composite. To the best of author knowledge, there is no report found on NFO/PPy core–shell electrode for supercapacitor applications
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