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Indexed by:期刊论文

Date of Publication:2019-03-05

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:776

Page Number:22-30

ISSN No.:0925-8388

Key Words:Graphene oxide; Ionic liquid; Electrostatic self-assemble; Flexible supercapacitor

Abstract:Flexible solid-state supercapacitors are arousing tremendous research enthusiasm in modern wearable and portable electronic equipment. Fabricating flexible electrode materials turns out to be a key challenge. Here, we developed a facile ionic liquid induced electrostatic self-assemble method to prepare bendable reduced graphene oxide (ILG). Due to electrostatic interaction between ionic liquid and graphene oxide, the ionic liquid can effectively prevent the aggregation of GO layers and protect partial O-containing functional groups at the same time. The IL plays great roles of a protector and stabilizer. The obtained ILG shows high specific capacitance (260 F g(-1) at 0.5 A g(-1)), superior rate capability (62% from 0.5 to 100 A g(-1)) and outstanding energy density (9.03 W h kg(-1) at 125 W kg(-1)) in 6 M KOH electrolyte. The constructed flexible symmetric all-solid-state supercapacitor also exhibits a specific capacitance of 195 F g(-1) at 0.5 A g(-1) and approximately 100% capacitance retention at different bending angels. The one-step approach might provide us with a new avenue for designing other flexible materials used in bendable devices. (C) 2018 Elsevier B.V. All rights reserved.