Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor

Abstract

Three-dimensional MnO 2 nanorods were synthesized on a carbon cloth (CC) via hydrothermal method to fabricate binder-free electrode for flexible supercapacitor application. The fabricated MnO 2 /CC electrode exhibits specific capacitance of 487 F g −1 at current density of 2 A g −1 in conventional three electrode system using 1 M Na 2 SO 4 electrolyte. Furthermore, a flexible symmetric supercapacitor is assembled using 1 M Na 2 SO 4 electrolyte which shows maximum specific capacitance of 232 F g −1 at current density of 0.5 A g −1. The supercapacitor exhibits specific energy up to 5.18 Wh kg −1 and specific power of 242 W kg −1 at 0.5 and 1.0 A g −1 , respectively. Furthermore, the supercapacitor exhibits specific capacitance retention of 91.7% over 1000 charging discharging cycles. The attractive performance suggests that MnO 2 /CC supercapacitor has potential application for energy storage.

Capped Keggin Type Polyoxometalate-Based Inorganic–Organic Hybrids Involving In Situ Ligand Transformation as Supercapacitors and Efficient Electrochemical Sensors for Detecting Cr(VI)

“…The 0.5 cm × 2 cm piece of carbon cloth (CC) was pretreated according to the reported method . It was ultrasonically washed three times in acetone, ethanol, and deionized water for 30 min.…”

“…The 0.5 cm × 2 cm piece of carbon cloth (CC) was pretreated according to the reported method. 27 It was ultrasonically washed three times in acetone, ethanol, and deionized water for 30 min. A mixture containing graphite powder (0.0050 g), the complex (0.0025 g), and polyvinylpyrrolidone (PVDF, 0.0005 g) was ground in an agate mortar for 40 min, which was coated onto one side of the treated CC.…”

3D-Printed Ultralight, Superelastic Reduced Graphene Oxide/Manganese Dioxide Foam for High-Performance Compressible Supercapacitors

“…(a) Schematic illustration of the assembled compressible symmetrical device based on 3DP-rGO–MnO 2 -3 electrodes, (b) CV curves at various scan rates, (c) GCD curves at different current densities of the device, (d) rate performance of the device, (e) Ragone plot of the device (red points) compared with those reported in the literature, ,− and (f) cycling stability and Coulombic efficiency of the device after 20,000 cycles at a scan rate of 200 mV/s.…”

Investigation of supercapacitor cyclic degradation through impedance spectroscopy and Randles circuit model

“…KKT can be used when the amplitude of the transfer function is finite at all frequencies to validate the EIS data. 20 For instance, imaginary component of the impedance from the measured real component can be calculated by following Equation (1).…”

“…Supercapacitors (SCs), 1 are charge storage devices, 2,3 which can facilitate swift storing and delivery of energy. By virtue of high surface area of electrodes with small distance to counter ions, SCs deliver power density 4 up to 100 kWKg À1 .…”