title: All-solid-state reduced graphene oxide supercapacitor with large volumetric capacitance and ultralong stability prepared by electrophoretic deposition method.
abstract: Portable energy storage devices have gained special attention due to the growing demand for portable electronics. Herein, an all-solid-state supercapacitor is successfully fabricated based on a poly(vinyl alcohol)-H3PO4 (PVA-H3PO4) polymer electrolyte and a reduced graphene oxide (RGO) membrane electrode prepared by electrophoretic deposition (EPD). The RGO electrode fabricated by EPD contains an in-plane layer-by-layer alignment and a moderate porosity that accommodate the electrolyte ions. The all-solid-state RGO supercapacitor is thoroughly tested to give high specific volumetric capacitance (108 F cm(-3)) and excellent energy and power densities (7.5 Wh cm(-3) and 2.9 W cm(-3), respectively). In addition, the all-solid-state RGO supercapacitor exhibits an ultralong lifetime for as long as 180 days (335 000 cycles), which is an ultrahigh cycling capability for a solid-state supercapacitor. The RGO is also tested for being used as a transparent supercapacitor electrode demonstrating its possible use in various transparent optoelectronic devices. Due to the facile scale-up capability of the EPD process and RGO dispersion, the developed all-solid-state supercapacitor is highly applicable to large-area portable energy storage devices.
authors.affiliation: Department of Energy Science, Sungkyunkwan University , Suwon 440-746, South Korea.
authors.forename: Mei
authors.initials: M
authors.lastname: Wang
authors.forename: Le Dai
authors.initials: le D
authors.lastname: Duong
authors.forename: Nguyen Thi
authors.initials: NT
authors.lastname: Mai
authors.forename: Sanghoon
authors.initials: S
authors.lastname: Kim
authors.forename: Youngjun
authors.initials: Y
authors.lastname: Kim
authors.forename: Heewon
authors.initials: H
authors.lastname: Seo
authors.forename: Ye Chan
authors.initials: YC
authors.lastname: Kim
authors.forename: Woojin
authors.initials: W
authors.lastname: Jang
authors.forename: Youngkwan
authors.initials: Y
authors.lastname: Lee
authors.forename: Jonghwan
authors.initials: J
authors.lastname: Suhr
authors.forename: Jae-Do
authors.initials: JD
authors.lastname: Nam
keywords: EPD; RGO; solid-state supercapacitor; volumetric capacitance; volumetric energy density