Flexible Asymmetric Microsupercapacitors from Freestanding Hollow Nickel Microfiber Electrodes

Ahiud Morag, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The increasing demand for flexible and wearable microelectronics is a major driving force for the development of high-performance small-volume energy sources. Microsupercapacitors exhibit significant potential in energy storage as they provide high power and good cycle stability. Yet, most microsupercapacitors display low energy densities limiting their practical use in microelectronics. Here, synthesis of high surface area freestanding electrodes comprising hollow nickel microfibers is demonstrated. The microfiber nickel electrodes constitute a platform for flexible asymmetric microsupercapacitors exhibiting excellent mechanical resilience as well as high energy density (0.11 mWh cm−2) and power density (37.5 mW cm−2). The freestanding nature and extensive surface area of the electrodes contribute to pronounced areal and volumetric capacitance, energy storage values, and stability after numerous (hundreds) physical bending cycles. The simple preparation scheme and use of an inexpensive building block (e.g., nickel) underscore potential uses as light and flexible energy storage devices.

Original languageEnglish
Article number1800584
JournalAdvanced Electronic Materials
Volume5
Issue number1
DOIs
StatePublished - 1 Jan 2019

Keywords

  • areal capacitance
  • asymmetric supercapacitors
  • electroless deposition
  • flexible microsupercapacitors
  • nickel electrodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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