Effect of Electrolyte Concentration on Electrochemical Performance of Bush Like α‐Fe₂O₃ Nanostructures

Abstract

The nano-sized bush-like α-Fe 2 O 3 particles were synthesized using sol-gel auto combustion route. The structural characterization of obtained α-Fe 2 O 3 was performed by X-ray diffraction (XRD) method to confirm its phase and crystallinity. The Scanning Electron Microscopy (SEM) confirmed the formation of bush-like nanostructure which was further used for the electrochemical charge storage performance testing. The electrochemical performances of the synthesized electrode material were studied by using Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis in a three electrode configuration. The variation of specific capacitance values with the different molar concentration of electrolyte has been discussed. An enhancement in the specific capacitance has been observed up to 3 M KOH electrolyte solution. The maximum value of specific capacitance is 202.2 F g À 1 which is obtained at a scan rate of 2 mV s À 1 for 3 M aqueous KOH solution as electrolyte.

Binder-free all-carbon composite supercapacitors

“…For instance, Yasnur et al investigated the impact of the concentration of potassium hydroxides (KOH) on the electrochemical performance of oxides nanostructures. They observed the specific capacitance increased with increasing the concentration of KOH [34]. Among electrolytes, aqueous electrolytes like KOH are conventionally used due to their low cost, environment friendliness and simplifying the fabrication steps of supercapacitors.…”