Co₃O₄ Nanowires on Flexible Carbon Fabric as a Binder-Free Electrode for All Solid-State Symmetric Supercapacitor

Abstract

Developing portable, lightweight, and flexible energy storage systems has become a necessity with the advent of wearable electronic devices in our modern society. This work focuses on the fabrication of Co 3 O 4 nanowires on a flexible carbon fabric (CoNW/CF) substrate by a simple cost-effective hydrothermal route. The merits of the high surface area of the prepared Co 3 O 4 nanostructures result in an exceptionally high specific capacitance of 3290 F/g at a scan rate of 5 mV/s, which is close to their theoretical specific capacitance. Furthermore, a solid-state symmetric supercapacitor (SSC) based on CoNW/CF (CoNW/CF//CoNW/CF) was fabricated successfully. The device attains high energy and power densities of 6.7 Wh/kg and 5000 W/kg. It also demonstrates excellent rate capability and retains 95.3% of its initial capacitance after 5000 cycles. Further, the SSC holds its excellent performance at severe bending conditions. When a series assembly of four such devices is charged, it can store sufficient energy to power a series combination of five light-emitting diodes. Thus, this SSC device based on a three-dimensional coaxial architecture opens up new strategies for the design of next-generation flexible supercapacitors.

Two-Dimensional Mn3O4Nanowalls Grown on Carbon Fibers as Electrodes for Flexible Supercapacitors

“…10−12 Supercapacitors utilizing flexible electrodes have received high demand in the scientific community due to their feasible incorporation in the flexible electronic devices. 13,14 Not only the electrodes but also the current collector substrates should be flexible to achieve the total flexibility. A prerequisite for a good supercapacitor for flexible application is that the performance of the supercapacitor should not be altered at severe bending and twisting conditions.…”

Three-dimensional nickel vanadium layered double hydroxide nanostructures grown on carbon cloth for high-performance flexible supercapacitor applications

“…All EIS measurements were done at open circuit potential. The specic capacitance, energy density (E) and power density (P) of the HSC were calculated using the following equations: 29,30…”

Toward Flexible and Wearable Zn–Air Batteries from Cotton Textile Waste

“…To date, a large number of energy storage/conversion systems have been studied, such as solar cells, 15−19 fuel cells, 20−24 supercapacitors, 25−31 lithium-ion batteries, 32−36 and metal–air batteries. 37−42 Among them, metal–air batteries possess high theoretical energy densities, being regarded as the promising candidates as power suppliers for next-generation flexible electronics.…”