Flexible and Alternately Layered High‐Loading Film Electrode based on 3D Carbon Nanocoils and PEDOT:PSS for High‐Energy‐Density Supercapacitor

Abstract

The development of flexible carbon‐based film electrodes with high loading and sufficient electron/ion transport channels is of great significance but still challenging. Herein, a flexible high‐loading (over 15 mg cm–2) film with 3D hierarchical pores is prepared by an alternate deposition of carbon nanocoils (CNCs) and poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The unique alternate architecture of CNC/PEDOT:PSS bilayers possesses porous structure constructed by interconnected CNCs, which serves as transfer channels and storage chambers of ions. Meanwhile, the PEDOT:PSS layers anchoring CNCs function as not only the cement to ensure the stability of the film structure but also the current collectors to improve electron transfer kinetics between interlayers. The film electrode shows excellent flexibility and electrochemical properties. It delivers a high areal capacitance of 1402.5 mF cm–2 at 0.25 mA cm–2 and a superior stability even at an extremely high current density of 50 mA cm–2 after 10 000 cycles. The corresponding solid‐state supercapacitor has great energy storage ability and steady capacitance response under various deformation. The device achieves a superb energy density of 211 μW h cm–2 with a wide potential window of 2 V. This strategy paves a road for the controllable fabrication of high‐performance flexible electrodes and supercapacitors.

Last developments in polymers for wearable energy storage devices

“…In addition, Huang et al 127 recently reported a PEDOT:PSS/carbon nanocoils polymer composite to obtain SC electrodes with film‐shaped. The polymer matrix apported mechanical stability while the nanofillers allows the formation of interconnected hierarchical pores, which operate as ions transport channels, shortening the diffusion pathways, and as electrolyte storage reservoir.…”

Interface Engineering of Biomass‐Derived Carbon used as Ultrahigh‐Energy‐Density and Practical Mass‐Loading Supercapacitor Electrodes

“…Aiming to develop high‐performance FSCs, exploring novel active materials and electrode structures are two feasible strategies. [ 1 ]…”

“…Aiming to develop high-performance FSCs, exploring novel active materials and electrode structures are two feasible strategies. [1] In view of active materials development, heteroatom-doped graphene-like carbon materials stand out from conductive polymers, metal oxides, and other carbon materials due to their 2D plane structures, high surface area, good electrical conductivity, and stability. Moreover, heteroatom-doping can greatly boost the electrochemical properties of graphene-like carbon materials owing to the change of electronic charge density and asymmetric spin density for additional redox reactions.…”

Rational Design of NiCo2S4 Nanosheet Arrays Modified by Nitrogen-Doped Graphene Quantum Dots with Enhanced Charge Storage Performance for Flexible Supercapacitors

“…In addition, the kinetic response of most transition-metal compound materials is slow, resulting in a low energy conversion efficiency of the device. Therefore, it is very challenging to construct a high-performance supercapacitor with good electrochemical performance, mechanical flexibility, and stretchability. − …”