Flexible free-standing graphene paper with interconnected porous structure for energy storage. Issue 8 (22nd January 2015)

• Record Type: Journal Article
• Authors: Shu, Kewei; Wang, Caiyun; Li, Sha; Zhao, Chen; Yang, Yang; Liu, Huakun; Wallace, Gordon
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 8(2015)
• Page Start: 4428
• Page End: 4434
• Publication Date: 2015-01-22
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c4ta04324c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Flexible porous graphene paper was obtained via facile freeze drying method. It exhibits an excellent electrode performance in both the lithium battery and solid-state supercapacitor. Abstract : A novel porous graphene paper is prepared via freeze drying a wet graphene oxide gel, followed by thermal and chemical reduction. The macroscopic structure of the formed graphene paper can be tuned by the water content in the gel precursor. With 92% water content, an interconnected macroporous network can be formed. This porous graphene (PG) paper exhibits excellent electrochemical properties. It can deliver a high discharge capacity of 420 mA h g −1 at a current density of 2000 mA g −1 when used as binder-free lithium ion battery anode. PG paper exhibits a specific capacitance of 137 F g −1 at 1 A g −1 in a flexible all-solid-state supercapacitor with PVA/H2 SO4 electrolyte. It can maintain 94% of its capacitance under bending. This electrochemical performance and mechanical flexibility makes it an excellent material for flexible energy storage devices.