Ternary composite solid-state flexible supercapacitor based on nanocarbons/manganese dioxide/PEDOT:PSS fibres

Abstract

Flexible fibre supercapacitors were fabricated by wet-spinning from carbon nanotube/carbon black dispersions, followed by straightforward surface treatments to sequentially deposit MnO2 and PEDOT:PSS to make ternary composite fibres. Dip coating the fibres after the initial wet-spinning coagulation creates a simple solution-based continuous process to produce fibre-based energy storage. Well-controlled depositions were achieved and have been optimised at each stage to yield the highest specific capacitance. A single ternary composite fibre exhibited a specific capacitance of 351 F g-1. Two ternary composite fibre electrodes were assembled together in a parallel solid-state device, with polyvinyl alcohol/H3PO4 gel used as both an electrolyte and a separator. The assembled flexible device exhibited a high specific capacitance of 51.3 F g-1 with excellent both charge-discharge cycling (84.2% capacitance retention after 1000 cycles) and deformation cycling stability (82.1% capacitance retention after 1000 bending cycles). *Graphical Abstract Click here to download high resolution image Highlights

Solvent Treatment of Wet-Spun PEDOT: PSS Fibers for Fiber-Based Wearable pH Sensing

“…Electrically conducting fiber electrodes have been fabricated from carbons such as carbon nanotubes [5] and graphene [6] and conducting polymers such as polyaniline (Pani) [7], polypyrrole [8], and polyethylene dioxythiophene (PEDOT) [9]. Conducting polymers are particularly appealing for electronic textiles due to their intrinsic electrical and electrochemical properties such as high electrical conductivity, electrochemical switching, and charge storage [10,11,12,13]. The ease with which they can undergo solution processing allows continuous conductive fiber production using simple wet-spinning.…”

Recent Advances in Design of Flexible Electrodes for Miniaturized Supercapacitors

“…The areal capacitance reached 6.05 mF cm −2 at 10 mV s −1 and 14.3 mF cm −2 at 50 mA cm −2 for each single unit (Figure 2d,e). By hybridizing with electrochemically active materials such as conductive polymers, transition metal oxides/hydroxides, transition metal dichalcogenides, and transition metal carbides, fiber performances were effectively modulated. For instance, Sun et al prepared a gel composed of GO and MoS 2 for wet‐spinning .…”

Wearable supercapacitors based on graphene nanoplatelets/carbon nanotubes/polypyrrole composites on cotton yarns electrodes

“…The widespread application of wearable electronics in healthcare devices, actuators and sensors requires truly wearable devices [1][2][3][4][5][6][7][8]. In consequence, it has been observed an increasing demand for lightweight and flexible devices characterized by high conductivity level, thermal stability and negligible degradation under repeated use [9].…”

“…In consequence, it has been observed an increasing demand for lightweight and flexible devices characterized by high conductivity level, thermal stability and negligible degradation under repeated use [9]. One of the most important applications for wearable devices refers to the development of flexible storage devices (flexible supercapacitors) [10] with characteristic high-power density, long cycling life and fast charge-discharge rate [1,2,[11][12][13].…”

“…Despite these important properties, the cotton yarn is characterized by poor electrical properties (it is an insulator) [24,25]. Cotton-based supercapacitors require adequate covering of cotton yarns with electrochemically active materials, that offer both higher energy and power density in response of adequate combination of electric double-layer capacitors (EDLC) and pseudocapacitors [1,2,26].…”