Abstract
We reported a scalable and modular method to prepare a new type of sandwich-structured graphene-based nanohybrid paper and explore its practical application as high-performance electrode in flexible supercapacitor. The freestanding and flexible graphene paper was firstly fabricated by highly reproducible printing technique and bubbling delamination method, by which the area and thickness of the graphene paper can be freely adjusted in a wide range. The as-prepared graphene paper possesses a collection of unique properties of highly electrical conductivity (340 S cm−1), light weight (1 mg cm−2) and excellent mechanical properties. In order to improve its supercapacitive properties, we have prepared a unique sandwich-structured graphene/polyaniline/graphene paper by in situ electropolymerization of porous polyaniline nanomaterials on graphene paper, followed by wrapping an ultrathin graphene layer on its surface. This unique design strategy not only circumvents the low energy storage capacity resulting from the double-layer capacitor of graphene paper, but also enhances the rate performance and cycling stability of porous polyaniline. The as-obtained all-solid-state symmetric supercapacitor exhibits high energy density, high power density, excellent cycling stability and exceptional mechanical flexibility, demonstrative of its extensive potential applications for flexible energy-related devices and wearable electronics.
Highlights
We reported a scalable and modular method to prepare a new type of sandwich-structured graphene-based nanohybrid paper and explore its practical application as high-performance electrode in flexible supercapacitor
Our results have showed that the following dip coating of an ultrathin graphene layer on the surface of the porous PANI nanofibers leads to the formation of a graphene/PANI/graphene nanohybrid paper with a unique sandwich structure, which further increases the specific capacitance and improves the cycling stability of the paper electrodes
The graphene oxide (GO) paper was firstly fabricated by spreading GO solution on a piece of standard commercial A4 paper via a facile and scalable printing technique (Fig. 1b)
Summary
We reported a scalable and modular method to prepare a new type of sandwich-structured graphene-based nanohybrid paper and explore its practical application as high-performance electrode in flexible supercapacitor. Papers[14], films[15] and clothes[16] made from carbon materials have been demonstrated to be suitable for this purpose In comparison with the former method, the freestanding electrodes can significantly simplify cell packing by eliminating inactive ingredients such as binders and current collectors, and improve the overall performance when the total mass of the device is taken into account, which holds great promising for the development of ultrathin, lightweight and high-performance SCs. Carbon-based nanomaterials have attracted enormous scientific and technological interest for their potential applications in energy storage and conversion such as ultracapacitors, batteries, fuel cells and solar cells. These substantially demonstrate the extensive potential applications the proposed graphene nanohybrid paper for flexible energy-related device and wearable electronics
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