Solid-state symmetrical supercapacitor using chemically modified multiwalled carbon nanotubes.

Using multi-walled carbon nanotubes (MWCNTs) that were purchased commercially, porosity growth was developed following chemical activation by KOH. Chemical activation was used to create activated multi-walled carbon nanotubes (A-MWCNTs), which have well-developed pore architectures and can be used as energy storage materials. The A-MWCNTs' microstructure and crystallinity were assessed using Raman spectroscopy. A-MWCNTs' specific surface area and pore size distribution were examined using nitrogen gas sorption analysis at 77 K. The outcomes showed that, at an activation temperature of 800°C, the MWCNTs' specific surface area increased from 251.6 m2/g (for Pristine MWCNTs) to 371.5 m2/g (for A-MWCNTs). In this instance, the specific capacitance of the nanotubular electrode material increased from 114 F/g to 193 F/g in the potential range of 0-1 V (as from GCD data at a current density of 0.5 Ag−1), and microporosity was significantly improved. Suspension in water was verified by using ultrasonication. It's probable attributed microporosity was increased which is strongly related to the energy storage capacity. This demonstrates how pore diameter affects energy storage behavior. Even though a large pore diameter is desirable for storing energy. The precursor reacts with KOH, destroying the nanotubular shape. With KOH, which produced a significant number of flaws in the nanotube walls, activation effects are visible. The well-conducting nanotubular material's open mesoporous network enables simple ion access to the electrode/electrolyte interface. The A-MWCNT-based solid-state supercapacitor electrodes have an extended voltage window with high specific capacitance and exhibit excellent cyclic stability even after 10,000 cycles. [ABSTRACT FROM AUTHOR]