title: High-performance supercapacitor electrodes based on graphene hydrogels modified with 2-aminoanthraquinone moieties.
abstract: 2-Aminoanthraquinone (AAQ) molecules were covalently grafted onto chemically modified graphene (CMG), and the AAQ functionalized CMG sheets were self-assembled into macroporous hydrogels for supercapacitor electrodes. The electrode based on the AAQ modified self-assembled graphene hydrogel (AQSGH) showed a high specific capacitance of 258 F g(-1) at a discharge current density of 0.3 A g(-1), which is much larger than that of a pure graphene hydrogel (193 F g(-1)). Furthermore, the AQSGH electrode exhibited excellent rate capability and a long cycle life. This is mainly due to the covalently bonded AAQ moieties contributing additional redox capacitance. Furthermore, the highly conductive graphene hydrogel scaffold provided a large specific surface area for forming electric double layers and convenient routes for charge transfer and electrolyte diffusion.
authors.affiliation: Department of Chemistry, Tsinghua University, Beijing, People's Republic of China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Wu
authors.forename: Yiqing
authors.initials: Y
authors.lastname: Sun
authors.forename: Hua
authors.initials: H
authors.lastname: Bai
authors.forename: Gaoquan
authors.initials: G
authors.lastname: Shi