Fabrication of Ni-Co binary oxide/reduced graphene oxide composite with high capacitance and cyclicity as efficient electrode for supercapacitors

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• 作者：Yang Bai ; Miaomiao Liu ; Jing Sun ; Lian Gao
• 关键词：Supercapacitors ; Ni ; Co binary oxide ; Reduced graphene oxide ; High capacitance
• 刊名：Ionics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：22
• 期：4
• 页码：535-544
• 全文大小：909 KB
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• 作者单位：Yang Bai (1)
  Miaomiao Liu (1)
  Jing Sun (1)
  Lian Gao (1)
  
  1. The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai, 200050, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

Nickel-cobalt binary oxide/reduced graphene oxide (G-NCO) composite with high capacitance is synthesized via a mild method for electrochemical capacitors. G-NCO takes advantages of reduced graphene oxide (RGO) and nickel-cobalt binary oxide. As an appropriate matrix, RGO is beneficial to form homogeneous structure and improve the electron transport ability. The binary oxide owns more active sites than those of nickel oxide and cobalt oxide to promote the redox reaction. Attributed to the well crystallinity, homogeneous structure, increased active sites, and improved charge transfer property, the G-NCO composite exhibits highly enhanced electrochemical performance compared with G-NiO and G-Co₃O₄ composites. The specific capacitance of the G-NCO composite is about 1750 F g−1 at 1 A g−1 together with capacitance retention of 79 % (900/1138 F g−1) over 10,000 cycles at 4 A g−1. To research its practical application, an asymmetric supercapacitor with G-NCO as positive electrode and activated carbon as negative electrode was fabricated. The asymmetric device exhibits a prominent energy density of 37.7 Wh kg−1 at a power density of 800 W kg−1. The modified G-NCO composite shows great potential for high-capacity energy storage.