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Ultrathin and Highly Crystalline Co 3 O 4 Nanosheets In Situ Grown on Graphene toward Enhanced Supercapacitor Performance
Author(s) -
Ding Kun,
Yang Ping,
Hou Pengkun,
Song Xueling,
Wei Tao,
Cao Yongqiang,
Cheng Xin
Publication year - 2017
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201600884
Subject(s) - supercapacitor , materials science , graphene , calcination , electrode , oxide , electrochemistry , nanotechnology , capacitance , hydrothermal circulation , chemical engineering , hydrothermal synthesis , catalysis , metallurgy , organic chemistry , chemistry , engineering
Effective design of an electrode material is essential for energy storage and conversion of supercapacitor. Herein, a well‐designed architecture of ultrathin and highly crystalline Co 3 O 4 nanosheets (NSs) with a thickness of 2–3 nm are grown in situ on reduced graphene oxide (RGO) via a hydrothermal route and a subsequent calcination process. During synthesis, graphene oxide (GO) affects the growth of precursor. The Co 3 O 4 /RGO composites are employed as electrode material of supercapacitor with the aim of achieving the high electrochemical performance. The results indicate that Co 3 O 4 /RGO‐2 electrode (the mass ratio of CoCl 2 to GO is 10:1) has the best performance with a specific capacitance of 3344.1 F g −1 at a current density of 1.25 A g −1 , fine rate capability, and retention capacity of 87.9% even after 6000 cycles at 10 A g −1 . Such excellent performance is ascribed to the synergistic effects of ultrathin and highly crystalline Co 3 O 4 NSs and its interacting model with RGO. This ultrathin sheet–sheet architecture will provide a promising for electrochemical fields.