Design, Fabrication and Characterization of a Commercially Prepared Carboxyl Multiwalled Carbon Nanotubes With a Hybrid Polymer Electrolytes

Abstract

We reported the fabrication of three different supercapacitor cells using a commercially prepared carboxyl multiwalled carbon nanotubes (CPCMWCNTs) as electrode, and hybrid solid polymer electrolytes (HSPE) of different electrical conductivities as separators. The Three cells were then constructed and leveled as cell-A (C90PVdF-HFP10 |H50| C90PVdF-HFP10), cell-B (C90PVdF-HFP10 |H60| C90PVdF-HFP10) and cell-C (C90PVdF-HFP10 |H70| C90PVdF-HFP10). Numbers of analysis, such as FESEM, XRD, TGA and electrochemical analysis were carried out on both the commercial CNT and that of the electrolytes. From the overall results of the electrochemical analysis of cyclic voltammetry (CV), cell-B delivered higher capacitance of 60.10 Fg −1 doubling that of cell-A, and tripling cell-C. Whereas the charge-discharge (CD) tests carried out in the cells reveals that even at the lower voltage window of 1.5 V, cell-A delivered slightly better than that of B and C with a balanced and good discharge capacitance of 86.06 Fg −1 and higher energy/power densities of 432.22 Jg −1 /8.37 Jg −1 s −1 and less internal resistance. All the cells were able to deliver a modest capacitance at a voltage window of 3V.

Scan Rates and the Disparities in the Electrochemical Double Layer Capacitor (EDLC) Performance

“…However, their short cycle life of ∼1000 cycles and low power density cannot meet the increasing cycle stability and power demands of the electronic devices. Electrochemical capacitors (ECs) invention and commercialization by General Electric (in 1966) and NEC (in 1978), made tremendous progress, in terms of their power densities [2][3][4] with the fast charge/discharge rate [5,6], energy density, safety, reliability, and cost reduction in meeting the specific requirements for different applications [7,8] and less or no hazardous or toxic materials [9][10][11].…”