Preparation of Electrochemical Supercapacitor Based on Polypyrrole/Gum Arabic Composites

The current research focused on the super capacitive behavior of organic conducting polymer, i.e., polypyrrole (PPy) and its composites with gum arabic (GA) prepared via inverse emulsion polymerization. The synthesized composites material was analyzed by different analytical techniques, such as UV-visible, FTIR, TGA, XRD, and SEM. The UV-Vis and FTIR spectroscopy clearly show the successful insertion of GA into PPy matrix. The TGA analysis shows high thermal stability for composites than pure PPy. The XRD and SEM analysis show the crystalline and amorphous structures and overall morphology of the composites is more compact and mesoporous as compared to the pure PPy. The electrochemical properties of modified solid state supercapacitors established on pure polypyrrole (PPy), polypyrrole/gum arabic (PPy/GA) based composites were investigated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge–discharge (GCD). The specific capacitance of the PPy modified gold electrode is impressive (~168 F/g). The specific capacitance of PPy/GA 1 electrode has been increased to 368 F/g with a high energy density and power density (~73 Wh/kg), and (~599 W/kg) respectively.

Hydrothermally synthesized Nickel cobalt oxide for bifunctional electrochemical supercapacitor and nonenzymatic glucose biosensor

Herein, various nickel cobalt oxide nanostructures with different Ni concentrations are prepared via hydrothermal route and then calcination process for electrochemical supercapacitor as well as nonenzymatic glucose biosensor. The electrode synthesized on carbon cloth using Ni0.9Co2.1O4 nanosheet-like morphology showed a maximum 516.51 F g−1 specific capacitance at 10 mV s−1 scan rate and the cyclic stability of 87.7% over 2000 GCD cycles. The electrode prepared with Ni0.3Co2.7O4 on CC offered a linear response from 0 to 0.3 mM glucose concentration and exhibited a maximum of 759.5 µA mM−1 cm−2 glucose sensitivity.