CoO nanoflowers woven by CNT network for high energy density flexible micro-supercapacitor

Yun Guang Zhu, Ye Wang, Yumeng Shi, Jen It Wong, Hui Ying Yang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

185 Scopus citations


Miniaturized energy storage devices have attracted considerable research attention due to their promising applications such as power-on-chip units in various smart electronic devices. In this work, a printable micro-supercapacitor (MSC) device was designed and fabricated wherein a novel three dimensional (3D) nanocomposite consisting of cobalt oxide (CoO) nanoflowers woven with carbon nanotubes (CNTs) networks were used as the active material. The CoO/CNT nanocomposites were synthesized via a high-throughput hydrothermal method. High capacitance of 17.4F/cm3 and energy density of ~3.48mWh/cm3 were achieved for the CoO/CNT MSC at a current density of 0.25A/cm3. The high volumetric energy density is attributed to the widened operation voltage window ranging from 0 to 1.2V. Moreover, the printed CoO/CNT MSCs also showed remarkable cycling stability with ~85% energy density retention after 1700 cycles and high mechanical flexibility which can function well even after bending up to 180°. As a result, the printed CoO/CNT MSC is a possible contender in future energy storage devices for low-cost on-chip power applications.

Original languageEnglish (US)
Pages (from-to)46-54
Number of pages9
JournalNano Energy
StatePublished - Jan 2014
Externally publishedYes


  • Cobalt oxide
  • Flexible
  • High energy density
  • Microsupercapacitor
  • Screen printing

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


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