Highly porous honeycomb manganese oxide@carbon fibers core–shell nanocables for flexible supercapacitors

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)47-57
Journal / PublicationNano Energy
Online published12 Feb 2015
Publication statusPublished - Apr 2015


Core–shell electrodes composed of highly porous honeycomb manganese oxide@carbon fibers (HMO@CFs) are synthesized by a facile hydrothermal approach involving an in situ redox replacement reaction between potassium permanganate (KMnO4) and carbon fibers. In this reaction, the carbon fibers serve as not only a sacrificial reductant, but also the substrate. The porous HMO@CFs core–shell nanocables deliver remarkable electrochemical performance with a high capacitance (295.24 F g−1 at 100 mA g−1), high good rate capability, and superior cycling stability (about 96.4% specific capacitance retained after 3000 cycles). The maximum energy density of 22.2 W h kg−1 (at a power density of 400 W kg−1) and power density of 12,000 W kg−1 (at an energy density of 10 W h kg−1) can be achieved at an operating voltage of 1.6 V. The fabrication method is simple, cost-effective, and readily scalable thereby having large commercial potential.

Research Area(s)

  • Carbon fibers, Flexible supercapacitors, Honeycomb, Manganese oxide