Coral-like PEDOT Nanotube Arrays on Carbon Fibers as High-Rate Flexible Supercapacitor Electrodes

Abstract

Integration of conductive polymers with flexible substrate to construct an electronically conductive and mechanically flexible electrode is of great significance for a flexible energy storage device. This work reports a facile method to prepare coral-like poly(3,4-ethylenedioxythiophene) (PEDOT) nanotube arrays on textile carbon fibers (TCs) for high-rate supercapacitor application. The ZnO nanowires grown on TCs serve as a sacrificial template. Electrochemical polymerization of 3,4-ethylenedioxythiophene followed by template removal of ZnO nanowires yields a hybrid composed of PEDOT nanotubes vertically grown on TC (TC@PEDOT). The strong interfacial interactions between nanotubes and substrate afford the hybrid with superior mechanical flexibility and high conductivity (790 S m −1 ). More importantly, the tubular structure enables ∼88% PEDOT to be involved in the reversible redox reaction, delivering a specific capacitance 184 F g −1 in 1.0 M H 2 SO 4 electrolyte with 88% capacitance retention after 10 000 cycles. A solid-state TC@PEDOT-based supercapacitor with PVA-H 2 SO 4 as gel electrode exhibits a high-rate capability with a relaxation time constant (τ 0 = 0.96 s) very close to that in aqueous H 2 SO 4 electrolyte (τ 0 = 0.87 s). Moreover, it can withstand various bending and twisting tests without notable performance loss, giving the TC@PEDOT hybrid great promise as a high-rate electrode for flexible energy storage devices.

Construction of Bio‐inspired Film with Engineered Hydrophobicity to Boost Interfacial Reaction Kinetics of Aqueous Zinc–Ion Batteries

“…[ 42 ] After coating with PEDOT film, the MnO 2 signals were attenuated dramatically and the characteristic peaks of PEDOT film appeared, further confirming the successful synthesis of PEDOT polymer (Figure 3c). [ 43 ]…”

Electropolymerized Poly(3,4-ethylenedioxythiophene)/Screen-Printed Reduced Graphene Oxide–Chitosan Bilayer Electrodes for Flexible Supercapacitors

“… 41 In the S 2p XPS spectra ( Figure S3d ), peaks at 163.5 and 164.6 eV correspond to S atoms in the PEDOT thiophene ring structure; these exist in the form of spin-splitting double peaks S 2p 1/2 and S 2p 3/2 . 40 , 42 , 43 Asymmetric tail peaks (S+) at higher binding energies (165–168 eV) are associated with chlorine doping. This is attributed to the positively charged sulfur in the thiophene ring that leads to a wider distribution of the binding energy of the S 2p signal, resulting in asymmetric tails on the higher binding energy side.…”

Hierarchical network enabled flexible textile pressure sensors with ultra-high sensitivity, ultra-wide linearity and high-temperature resistance

“…After modi cation, it shows a similar Raman spectrum (D band and G band) but with a more distinguishable D + band and narrower full-width at half maximum (FWHM). This is because the modi cation process improves the structural order and purity of the CNT [35][36] . Here, the D and D + bands represent a double-resonance Raman mode, which is due to the amorphous carbon, disorder, defects, or ion intercalation between the graphitic walls.…”