Thicker carbon-nanotube/manganese-oxide hybridized nanostructures as electrodes for creation of fiber-shaped high-energy-density supercapacitors

Wei Gong, Bunshi Fugetsu, Zhipeng Wang, Takayuki Ueki, Ichiro Sakata, Hironori Ogata, Fei Han, Mingda Li, Lei Su, X. Zhang, Mauricio Terrones, Morinobu Endo

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This work demonstrates a high-energy-density and flexible supercapacitor as a potential energy source for smart electronics devices. Cathode and anode are fiber-shaped electrodes with manganese oxide (MnO2) being electrochemically inserted into densely interconnected carbon nanotube (CNT) networks as active domains, while carbon fibers (CF) serve as current collectors. The CNT/MnO2 hybrids are built up as a co-axial shell with an optimized thickness of 1.44 μm surrounding CF. Specific volumetric capacitance is found as high as 527 F cm−3 when a 1.0 M Na2SO4 aqueous solution is used as electrolyte; when a solid electrolyte (polyvinyl alcohol and lithium chloride, PVA/LiCl) is used, the specific volumetric capacitance is found as high as 492 F cm−3. These values, to the best of our knowledge, are the highest values of the specific volumetric capacitance among all the MnO2-based fiber-shaped electrodes reported in previous literature. An all-solid-state (PVA/LiCl) symmetric fiber-shaped supercapacitor cell is assembled and a volumetric energy density of 8.14 mWh cm−3 which is high enough for driving a portable LED device, is obtained. Our fiber-shaped supercapacitor cell is safe, flexible, and capable of powering smart electronic devices.

Original languageEnglish (US)
Pages (from-to)169-177
Number of pages9
JournalCarbon
Volume154
DOIs
StatePublished - Dec 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

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