Microfluidic‐Spinning‐Directed Conductive Fibers toward Flexible Micro‐Supercapacitors

Abstract

The large‐scale fabrication of the flexible fiber‐shaped micro‐supercapacitors has received major attention from both industrial and academic researchers. Herein, conductive and robust polyaniline‐wrapped multiwall carbon tubes reduced graphene oxide/thermoplastic polyurethane (PANI/MCNTs‐rGO/TPU) composite fibers are successfully fabricated on a large scale via the combination of facile microfluidic‐spinning process and in situ polymerization of aniline. Initially, MCNTs‐rGO/TPU fibers are formed in a T‐shape microfluidic chip, relying on the fast material diffusion and exchange in the microfluidic channel. Then, PANI/MCNTs‐rGO/TPU hybrid fibers are synthesized through an in situ chemical oxidative polymerization of aniline. With the assistance of polyaniline, these PANI/MCNTs‐rGO/TPU hybrid fibers exhibit enhanced electrochemical properties in comparison with pure MCNTs‐rGO/TPU fibers, especially in high specific capacitance, which is dramatically increased from 42.1 to 155.5 mF cm−2. Moreover, the PANI/MCNTs‐rGO/TPU hybrid fibers can endure various blending stresses, contributing to its outperforming flexibility and weavability. The best of the excellent electrochemical and mechanical properties of these conductive fibers is made to construct the flexible supercapacitors and various complicated functional fabrics.

Facile synthesis of carbon nanobranches towards cobalt ion sensing and high-performance micro-supercapacitors

“…S18, † the micro-SCs show the energy densities of 1.8-4.5 mW h cm À2 at the power densities of 3.2-0.08 mW cm À2 . To our knowledge, the maximum energy density of our micro-SCs can be comparable with that of other reported ber-based micro-SCs, such as CNT@Co 3 O 4 (1.03 mW h cm À2 ), 57 rGO/Ni (1.60 mW h cm À2 ), 58 PANI/MCNTs-rGO/TPU (3.45 mW h cm À2 ), 59 and rGO-CNT@CMC (3.84 mW h cm À2 ). 56 Furthermore, the cycling stability was performed by a continuous charging and discharging process at a voltage of 0 to 0.8 V at a current density of 0.4 mA cm À2 .…”

All-Solid-State Fiber-Shaped Asymmetric Supercapacitors with Ultrahigh Energy Density Based on Porous Vanadium Nitride Nanowires and Ultrathin Ni(OH)2 Nanosheet Wrapped NiCo2O4 Nanowires Arrays Electrode

“…These values are much greater than those of some recently reported FSC devices, such as the CF@RGO@MnO 2 fiber device (18.5 μWh/cm 2 , 0.4 mW/cm 2 ), 39 the MnO 2 -modified nanoporous gold wire device (5.4 μWh/cm 2 , 0.284 μW/cm 2 ), 40 ultrathin VN nanosheet/ carbon fiber (1.428 μWh/cm 2 , 0.051 mW/cm 2 ), 20 VO 2 / graphene yarn (8.2 μWh/cm 2 , 0.9 mW/cm 2 ), 41 symmetric PHCFs@PANI fibers device (55.3 μWh/cm 2 , 0.44 mW/ cm 2 ), 42 activated carbon@SWCNT yarn-based micro-SC (3.29 μWh/cm 2 , 0.04 mW/cm 2 ), 43 conductive polymer/ RuO 2 /PEDOT:PSS fibers device (22.5 μWh/cm 2 , 0.75 mW/ cm 2 ), 44 PANI/S-TiO 2 /Ti wires device (3.2 μWh/cm 2 , 0.5 mW/cm 2 ), 45 3DCS/polyaniline fiber device (30.92 μWh/cm 2 , 1.78 mW/cm 2 ), 46 and PANI/MCNTs-rGO/TPU hybrid fiber device (3.45 μWh/cm 2 , 0.017 mW/cm 2 ). 47 The FASC device's volumetric energy density of 27.5 mWh/cm 3 and volumetric power density of 2.91 W/cm 3 are also much higher than the values of some reported FSCs (Figure S9), such as MnO 2 coated carbon fiber-based micro-SC (0.12 mWh/cm 3 , 0.4 W/ cm 3 ), 6 MWCNT-rGO@cellulose composite yarn-based SC (3.7 mWh/cm 3 , 0.04 W/cm 3 ), 48 and Co 3 O 4 /metal fibers@ graphene/carbon fibers (0.62 mWh/cm 3 , 1.47 W/cm 3 ). 49 The superior electrochemical performance of the FASC device can be attributed to three factors.…”

Hybrid‐Filler Stretchable Conductive Composites: From Fabrication to Application

“…[ 53 ] In addition, CPs can also be used as the auxiliary filler to improve the electrical property of SCCs. [ 54 ]…”