title: Self-Assembled 3D Graphene-Based Aerogel with Co3 O4 Nanoparticles as High-Performance Asymmetric Supercapacitor Electrode.
abstract: Using graphene oxide and a cobalt salt as precursor, a three-dimensional graphene aerogel with embedded Co3 O4 nanoparticles (3D Co3 O4 -RGO aerogel) is prepared by means of a solvothermal approach and subsequent freeze-drying and thermal reduction. The obtained 3D Co3 O4 -RGO aerogel has a high specific capacitance of 660 F g(-1) at 0.5 A g(-1) and a high rate capability of 65.1 % retention at 50 A g(-1) in a three-electrode system. Furthermore, the material is used as cathode to fabricate an asymmetric supercapacitor utilizing a hierarchical porous carbon (HPC) as anode and 6 M KOH aqueous solution as electrolyte. In a voltage range of 0.0 to 1.5 V, the device exhibits a high energy density of 40.65 Wh kg(-1) and a power density of 340 W kg(-1) and shows a high cycling stability (92.92 % capacitance retention after 2000 cycles). After charging for only 30 s, three CR2032 coin-type asymmetric supercapacitors in series can drive a light-emitting-diode (LED) bulb brightly for 30 min, which remains effective even after 1 h.
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Lijing
authors.initials: L
authors.lastname: Xie
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Su
authors.affiliation: Materials Science & Engineering College, Liaoning University of Technology, Jinzhou 121001 (PR China).
authors.forename: Longfei
authors.initials: L
authors.lastname: Xie
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Qingqiang
authors.initials: Q
authors.lastname: Kong
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Guo
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Yaoyao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Liu
authors.initials: L
authors.lastname: Wan
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Kaixi
authors.initials: K
authors.lastname: Li
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683.
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Lv
authors.affiliation: Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (PR China), Fax: (+86) 0351-4189683. ccm@sxicc.ac.cn.
authors.forename: Chengmeng
authors.initials: C
authors.lastname: Chen
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004566:Electrodes; D005782:Gels; D006108:Graphite / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D005782:Gels; D010087:Oxides; D003035:Cobalt; D006108:Graphite; C060728:cobalt oxide
keywords: cobalt; graphene; hierarchical porous carbon; solvothermal; supercapacitors