The Fabrication of graphene-based paper electrode for bendable energy device

Abstract

We have reported the facile fabrication of flexible and bendable graphene-based electrode composed of graphene and cellulose which has been widely used in various portable energy-storage devices, flexible and bendable graphene-based electrode was easily prepared by the facile approach such as electrospraying and bar-coating method. A graphene dispersed ink was prepared in water using sodium dodecyl benzene sulfonate (SDBS). In Chapter 2, The electrospray-deposited patterns of graphene onto filter paper were characterized to study the effect of cellulose acetate phthalate (CAP) binder on the surface resistance of the resulting paper, The amount of CAP determines the extent of penetration of graphene into the heterogeneous networks, because graphene gets anchored and crowded into the network with CAP. CAP improved the electrical and mechanical characteristics of Graphene-coated paper (GCP), even though only a small amount of graphene was used during deposition. In Chapter 3, the fabrication of flexible and bendable graphene paper electrode (GPE) with a flat surface, whose internal structure has been formed with gradient porous build-up (from the 2-hydroxyethyl cellulose (HC)-coated paper). HC solution was used as a binder to form the gradient porous graphene layer, enabling it to create an anchoring force between the porous graphene layer and the filter paper. This unique structure not only offers an enhanced conductivity and good electrical contact between the electrode and electrolyte but also helps GPE to maintain good cyclic stability, proving its potential for use in various rechargeable and portable energy-storage devices.