Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 2, Pages 804-813Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta08330g
Keywords
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Funding
- Natural Science Foundation of Jiangsu Province of China [BK20150311]
- National Basic Research Program of China [2015CB755602]
- NSFC [21474034]
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Developing asymmetric supercapacitors (ASCs) is a promising alternative to achieve both wide voltage windows and high energy densities to meet the application requirements of hybrid vehicles and renewable energy systems. However, a major limitation of high performance asymmetric supercapacitors lies in negative electrode materials which possess relatively low specific capacitance compared to positive electrode materials. Herein, a novel MnO@C composite nanosheet array directly grown on conductive carbon cloth as a negative electrode is prepared successfully, which exhibits a large specific capacitance of 662.9 F g(-1) at a current density of 3.7 A g(-1) and an areal capacitance of 716 mF cm(-2) at a current density of 4 mA cm(-2). Afterward, a flexible ASC is successfully assembled with Co3O4 nanosheets and MnO@C nanosheets as the positive electrode and negative electrode, respectively. The optimized ASC achieves a high operating voltage of 1.7 V and displays intriguing performances with a high specific capacitance of 166 F g(-1), an exceptional energy density of 59.6 W h kg(-1) and superior rate capability and cycling stability. In addition, the ASC exhibits superior flexibility and mechanical stability even under severe bending states. The ASC based on MnO@C nanosheets as a promising candidate for high performance supercapacitors may pave the way for applications in high performance energy storage systems.
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