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Freestanding Graphene Paper Supported Three-Dimensional Porous Graphene−Polyaniline Nanocomposite Synthesized by Inkjet Printing and in Flexible All-Solid-State Supercapacitor

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ABSTRACT:

Freestanding paper-like electrode materials have trigged significant research interest for their practical application in flexible and lightweight

energy storage devices. In this work, we reported a new type of flexible nanohybrid paper electrode based on full inkjet printing synthesis of a
freestanding graphene paper (GP) supported three-dimensional (3D) porous graphene hydrogel (GH)−polyaniline (PANI) nanocomposite,

and explored its practical application in flexible all-solid-state supercapacitor (SC). The utilization of 3D porous GH scaffold to load

nanostructured PANI dramatically enhances the electrical conductivity, the specific capacitance and the cycle stability of

the GH−PANI nanocomposite. Additionally, GP can intimately interact with GH−PANI through π−π stacking to form a unique

freestanding GP supported GH−PANI nanocomposite (GH−PANI/GP) with distinguishing mechanical, electrochemical and capacitive

properties. These exceptional attributes, coupled with the merits of full inkjet printing strategy, lead to the formation of a high-performance

binder-free paper electrode for flexible and lightweight SC application. The flexible all-solid-state symmetric SC based on GH−PANI/GP electrode

and gel electrolyte exhibits remarkable mechanical flexibility, high cycling performance and acceptable energy density of 24.02 Wh kg−1

at a power density of 400.33 W kg−1. More importantly, the proposed simple and scale-up full inkjet printing procedure for the preparation of
freestanding GP supported 3D porous GH-PANI nanocomposite is a modular approach to fabricate other graphene-based nanohybrid papers

with tailorable properties and optimal components.

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