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Self‐Assembled 3D Graphene‐Based Aerogel with Co 3 O 4 Nanoparticles as High‐Performance Asymmetric Supercapacitor Electrode
Author(s) -
Xie Lijing,
Su Fangyuan,
Xie Longfei,
Li Xiaoming,
Liu Zhuo,
Kong Qingqiang,
Guo Xiaohui,
Zhang Yaoyao,
Wan Liu,
Li Kaixi,
Lv Chunxiang,
Chen Chengmeng
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500355
Subject(s) - aerogel , supercapacitor , graphene , materials science , nanoparticle , capacitance , anode , electrolyte , chemical engineering , carbon fibers , oxide , electrode , nanotechnology , composite material , chemistry , composite number , metallurgy , engineering
Using graphene oxide and a cobalt salt as precursor, a three‐dimensional graphene aerogel with embedded Co 3 O 4 nanoparticles (3D Co 3 O 4 –RGO aerogel) is prepared by means of a solvothermal approach and subsequent freeze‐drying and thermal reduction. The obtained 3D Co 3 O 4 –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.