Supercapacitor Based On a Commercially Prepared Hydroxyl Multiwalled Carbon Nanotubes With Hybrid Polymer Electrolyte

This paper reports on the development of three pieces of supercapacitor cells for portable applications such as mobile and wearable energy storage. In a primary embodiment, the three developed supercapacitors cells, each, consist of two flexible electrodes fabricated on thin metal base substrates. The electrode, mainly a commercially prepared multiwalled hydroxyl carbon nanotubes (CPHMWCNTs), sandwich a hybrid solid polymeric separator doped with an appropriate ionic material acting as an electrolyte. The integrated separator and electrolyte layer was made of filter paper, a polyvinyl alcohol (PVA) doped with phosphoric acid at three different concentrations. The Three cells were then assembled and leveled as cell-A (C90PVdF-HFP 10 |H50| C90PVdF-HFP 10), cell-B (C90PVdF-HFP 10 |H60| C90PVdF-HFP 10) and cell-C (C90PVdF-HFP10 |H70| C90PVdF-HFP 10). The evaluations of these three different electrodes and their substrate materials allowed for selection of a combination of active material and suitable percentage concentrations that yielded optimal supercapacitor performance. From the overall results of the electrochemical analysis of cyclic voltammetry (CV), cell-B delivered higher capacitance of 86.60.10 Fg super( -1) which was higher than the capacitance obtained by cell-C (65 Fg super( -1)) and even doubling the capacitance obtained by cell-A (42.1 Fg super( -1)). Whereas the charge-discharge (CD) tests carried out in the cells reveals that, even at the lower voltage window of 1.5 V, cell-B delivered better than cells A and C with a balanced and better discharge capacitance of 119.0 Fg super( -1) and higher energy/power densities of 597.0 Jg super( -1)/12.6 Jg super( -1)s super( -1) and very low internal resistance.