Rational design of coaxial MWCNT-COOH@NiCo2S4 hybrid for supercapacitors

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A simple one-step hydrothermal route was designed to decorate NiCo2S4 on the surface of carboxylated multiwalled carbon nanotubes (MWCNT-COOHs) to form coaxial MWCNT-COOH@NiCo2S4 hybrid. When employed as supercapacitor electrode material, the MWCNT-COOH@NiCo2S4 electrode shows a large specific capacitance and excellent rate performance. Coupled with activated carbon (AC) negative electrode, the operating voltage of MWCNT-COOH@NiCo2S4//AC asymmetric supercapacitor (ASC) could be extended to 1.5 V. Moreover, the MWCNT-COOH@NiCo2S4//AC ASC device achieves a maximum energy density of 33.6 Wh kg−1 at a power density of 375 W kg−1 with good cycle stability (about 83.3% of capacity was retained after 2000 cycles at 3 A g−1). In addition, a MWCNT-COOH@NiCo2S4//AC ASC device can drive a mini-fan. Therefore, the coaxial MWCNT-COOH@NiCo2S4 hybrid is a promising supercapacitor electrode material.

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We thank for the Financial Support from the National Science and Technology Support Program (2014BAC03B06) and National Natural Science Foundation of China (21373103).

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Correspondence to Zhongchun Li.

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Li, Z., Xin, Y., Jia, H. et al. Rational design of coaxial MWCNT-COOH@NiCo2S4 hybrid for supercapacitors. J Mater Sci 52, 9661–9672 (2017).

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  • Activate Carbon
  • Specific Capacitance
  • Multiwalled Carbon Nanotubes
  • Cyclic Voltammetry Curve
  • Equivalent Series Resistance