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3D Graphene Frameworks/Co 3 O 4 Composites Electrode for High‐Performance Supercapacitor and Enzymeless Glucose Detection
Author(s) -
Bao Lin,
Li Tao,
Chen Shu,
Peng Chang,
Li Ling,
Xu Qian,
Chen Yashao,
Ou Encai,
Xu Weijian
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201602077
Subject(s) - graphene , supercapacitor , materials science , capacitance , electrode , current density , nanoparticle , electrochemistry , oxide , nanotechnology , detection limit , composite material , chemical engineering , chemistry , metallurgy , physics , quantum mechanics , chromatography , engineering
3D graphene frameworks/Co 3 O 4 composites are produced by the thermal explosion method, in which the generation of Co 3 O 4 nanoparticles, reduction of graphene oxide, and creation of 3D frameworks are simultaneously completed. The process prevents the agglomeration of Co 3 O 4 particles effectively, resulting in monodispersed Co 3 O 4 nanoparticles scattered on the 3D graphene frameworks evenly. The prepared 3D graphene frameworks/Co 3 O 4 composites used as electrodes for supercapacitor display a definite improvement on electrochemical performance with high specific capacitance (≈1765 F g −1 at a current density of 1 A g −1 ), good rate performance (≈1266 F g −1 at a current density of 20 A g −1 ), and excellent stability (≈93% maintenance of specific capacitance at a constant current density of 10 A g −1 after 5000 cycles). In addition, the composites are also employed as nonenzymatic sensors for the electrochemical detection of glucose, which exhibit high sensitivity (122.16 µA m M −1 cm −2 ) and noteworthy lower detection limit (157 × 10 −9 M , S/N = 3). Therefore, the authors expect that the 3D graphene frameworks/Co 3 O 4 composites described here would possess potential applications as the electrode materials in supercapacitors and nonenzymatic detection of glucose.