title: Graphene oxide-based benzimidazole-crosslinked networks for high-performance supercapacitors.
abstract: The synthesis of graphene oxide (GO)-based benzimidazole-crosslinked network (GOBIN) materials is presented. These materials are prepared by the covalent crosslinking of GO sheets using a condensation reaction between the carboxylic acid moieties on the GO surface and the o-aminophenyl end groups of 3,3'-diaminobenzidine (or 1,2,4,5-benzenetetraamine tetrahydrochloride). An efficient one-pot catalyst- and template-free synthesis was performed. The obtained porous GO-based materials possess a Brunauer-Emmett-Teller specific surface area ranging from 260 to 920 m(2) g(-1). Electrochemical testing indicates that the GOBIN materials display a specific capacitance up to 370 F g(-1) at a current density of 0.1 A g(-1) and about 90% of the original capacitance is retained after 5000 cycles at a current density of 3 A g(-1). Therefore, GOBIN materials can be employed as promising electrode materials for high-performance supercapacitors with outstanding cycling stability. Furthermore, owing to their significantly high specific surface area, these materials also show hydrogen uptake (up to 1.24 wt%, at 77 K and 1.0 bar) and carbon dioxide capture (up to 14.2 wt%, at 273 K and 1.0 bar) properties. As a result, these GO-based porous materials improve both the supercapacitor performance and gas sorption property, which demonstrate an excellent performance in the practical application of energy storage.
authors.affiliation: National Center for Nanoscience and Technology, Beijing 100190, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Cui
authors.forename: Qian-Yi
authors.initials: QY
authors.lastname: Cheng
authors.forename: Haiping
authors.initials: H
authors.lastname: Wu
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Wei
authors.forename: Bao-Hang
authors.initials: BH
authors.lastname: Han
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry; D025802:Electric Capacitance; D055664:Electrochemical Techniques; D005740:Gases / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry
chemical_list: C539551:1,2,4,5-benzenetetraamine; D000814:Aniline Compounds; D002264:Carboxylic Acids; D005740:Gases; D010087:Oxides; D006108:Graphite