Polypyrrole and cotton fabric‐based flexible micro‐supercapacitors

Abstract

With the development of wearable electronic devices, there has been extensive research interest in portable energy supply systems. In this study, traditional cotton fabrics are finished with a water repellent coating and a single-sided polyurethane (PU) coating to impart hydrophobicity. The hydrophobic lightweight cotton fabric can float on the surface of the pyrrole polymerization system solution. With increasing polymerization time, the pyrrole continues to polymerize and deposit on the side in contact with the fabric, resulting in a one-sided conductive fabric.The highest doping level was obtained for the polypyrrole (PPy) coating for polymerization time of 12 h. For PPy coating thickness of 18 μm, the square resistance was as low as 220 Ω/sq. The PPy-12 fabric electrode showed excellent electrochemical performance and cycling stability. An interdigitated pattern was etched on the surface of the one-sided conductive fabric (PPy-12) using a N, Ndimethylformamide solution. Fabric micro-supercapacitors were obtained by assembling with a H 2 SO 4 /PVA gel electrolyte. The fabric micro-supercapacitor exhibited good flexibility and electrochemical energy storage properties. For current density of 0.08 mA/cm 2 and power density of 19.1 μW/cm 2 , the energy density of the device was 0.09 μWh/cm 2 . After 3000 cycles, the micro-supercapacitor retained approximately 85% of the capacitance. Thus, fabric-based flexible microsupercapacitors have excellent application potential in the field of energy storage.

MXene decorated 3D-printed carbon black-based electrodes for solid-state micro-supercapacitors

“…Our fabricated MSCs delivered a high areal energy density of 1.04 mW h cm −2 at a power density of 30 mW cm −2 , which is comparable to those of recently reported 3Dprinted MSCs (Table S1 †). 22,[44][45][46][47][48][49][50]…”

Polypyrrole micro/nanostructures and their soft materials in versatile forms: construction and applications

“…64,122 Increasing the specific area of the electrode is a straightforward way to improve the specific capacitance. Especially for the improvement of flexible supercapacitors, one strategy is depositing PPy onto flexible porous substrates such as cotton cloth 123 or carbon fabric. 91,124 For example, a composite electrode prepared by depositing PPy on a carbonized silk fibre surface 88 exhibited excellent area capacitance up to 4040 mF cm À2 at 2 mA cm À2 .…”

Recent Advances in Functional Fabric‐Based Wearable Supercapacitors

“…Since the pyrrole monomers polymerize in-situ at the oxidant adsorbed sites, a uniform oxidant layer ensures a continuous and denser PPy film deposition than on an untreated substrate. [92,93] Such an approach was adopted by Lu et al [94] to prepare a cotton WFE where the cotton fabric surface was first modified with hydrophobic polyurethane (PU). The PU coating rendered the fabric surface smooth and hydrophobic, which was conducive to PPy growth.…”

“…The device obtained 93.6% capacitance retention after 5000 cycles of charge-discharge, implying outstanding stability. [132] Lu et al [94] fabricated a planar MSC using PPy as a functional material. After the interfacial polymerization of pyrrole on the cotton fabric surface, the PPy layer was carefully etched by DMF in order to construct two separate electrodes on the fabric surface.…”