Journal
JOURNAL OF POWER SOURCES
Volume 473, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228609
Keywords
CNT@NiMn2O4; Core-shell nanocomposite; Microwave-assisted synthesis; Electrochemical properties; Asymmetric supercapacitor
Funding
- National Key Research and Development Program of China [2016YFB0101206]
- National Natural Science Foundation of China [21676040, 51879018]
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [2019JH3/30100009]
- Dalian Science and Technology Innovation Funds [2018J12GX053]
- Fundamental Research Funds for the Central Universities [3132019327, 3132019328]
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A carbon nanotube (CNT)@NiMn2O4 core-shell nanocomposite is successfully prepared by a facile microwave assisted hydrothermal process. The as-obtained nanocomposite exhibits low charge transfer resistance (2.19 Omega), high specific capacitance (up to 915.6 F g(-1) measured by charge-discharge at 1 A g(-1)) and excellent cycling stability (93.0% capacity retention after 5000 cycles at 5 A g(-1)). It is found that the weaker crystallinity induced by microwave treatment, synergism between CNTs and NiMn2O4 in the core-shell heterostructure and more defects and vacancies in CNTs caused by acidifying pretreatment can all devote to improving the electrochemical performance of the as-obtained nanocomposite. An asymmetric supercapacitor device using the as-obtained CNT@NiMn2O4 as positive electrode is also successfully fabricated, which exhibits the maximum energy density of 36.5 Wh kg(-1) at a power density of 800 W kg(-1) and outstanding cycling stability with 82.8% retains capacitance after 10000 cycles at 5 A g(-1). The excellent performance indicates that as-fabricated CNT@NiMn2O4 is one of the competitive electrode materials for energy storage devices.
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