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Issue 40, 2017
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Constructing hierarchical dandelion-like molybdenum–nickel–cobalt ternary oxide nanowire arrays on carbon nanotube fiber for high-performance wearable fiber-shaped asymmetric supercapacitors

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Abstract

Emerging fiber-shaped supercapacitors have been considered as promising new-state energy storage devices for next-generation wearable electronics. However, the limited energy densities arising from the small specific capacitance and low operating voltage severely restrict their practical application. Here, we develop a facile and effective method to directly grow dandelion-like molybdenum–nickel–cobalt ternary oxide (MNCO) nanowire arrays (NWAs) on carbon nanotube fiber (CNTF) with a high specific capacitance of 490.7 F cm−3 (1840 mF cm−2) at a current density of 1 mA cm−2. Benefiting from the three-dimensional nanostructure, high conductivity and excellent pseudocapacitance properties, we successfully fabricate a fiber-shaped asymmetric supercapacitor (FASC) with a maximum operating voltage of 1.6 V, which is assembled by twisting a MNCO/CNTF positive electrode and thin carbon-coated VN NWAs on CNTF negative electrode together with KOH/poly(vinyl alcohol) (PVA) as the gel electrolyte. The optimized FASC delivers a remarkable specific capacitance of 62.3 F cm−3 (233.7 mF cm−2) and an exceeding energy density of 22.2 mW h cm−3 (83.1 μW h cm−2). Additionally, it exhibits outstanding flexibility with capacitance retention maintained at 90.2% after bending 3500 times. Thus, the high performance MNCO/CNTF electrode opens a new avenue to fabricate high-performance FASCs for next-generation wearable energy storage devices.

Graphical abstract: Constructing hierarchical dandelion-like molybdenum–nickel–cobalt ternary oxide nanowire arrays on carbon nanotube fiber for high-performance wearable fiber-shaped asymmetric supercapacitors

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Publication details

The article was received on 20 Jul 2017, accepted on 14 Aug 2017 and first published on 15 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA06353A
Citation: J. Mater. Chem. A, 2017,5, 21153-21160
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    Constructing hierarchical dandelion-like molybdenum–nickel–cobalt ternary oxide nanowire arrays on carbon nanotube fiber for high-performance wearable fiber-shaped asymmetric supercapacitors

    J. Sun, Q. Zhang, X. Wang, J. Zhao, J. Guo, Z. Zhou, J. Zhang, P. Man, J. Sun, Q. Li and Y. Yao, J. Mater. Chem. A, 2017, 5, 21153
    DOI: 10.1039/C7TA06353A

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