Nanostructured Nickel/Ruthenium/Ruthenium-Oxide Supercapacitor Displaying Exceptional High Frequency Response

Ahiud Morag, Nitzan Maman, Natalya Froumin, Vladimir Ezersky, Katya Rechav, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The lower performance of pseudocapacitive supercapacitors in high-frequency applications such as alternating current (AC) line filtering has been ascribed to presumed slow kinetics of redox processes compared to ion diffusion in electric double layer capacitors. A nickel-deposited ruthenium/ruthenium-oxide symmetric supercapacitor exhibiting remarkable electrochemical properties, particularly very high frequency response (>1 kHz) is developed. The electrodes are prepared via a simple process consisting of electrochemical reduction of ruthenium chloride on commercially available nickel foil as the current collector. A symmetric supercapacitor comprising nickel/ruthenium/ruthenium-oxide electrodes and a polystyrene-based thin spacer exhibits particularly fast scan rates, high power density of 1500 mW cm−2 (88 kW cm−3) with a maximum energy density of 0.58 µWh cm−2 (34 mWh cm−3), and excellent capacitance retention. Notably, supercapacitors prepared by the same synthetic method albeit using conventional gold substrate instead of nickel exhibit significantly lower frequency response. The exceptional electrochemical properties of the nickel/ruthenium/ruthenium-oxide supercapacitor and simple electrode synthesis point to promising applicability in AC line filtering and power conditioning. In a broader context, this work demonstrates that, contrary to the widely held presumption, the kinetics of redox reactions at the active layers of pseudocapacitors may not be the primary barriers to high-frequency applications.

Original languageEnglish
Article number1900844
JournalAdvanced Electronic Materials
Volume6
Issue number1
DOIs
StatePublished - 1 Jan 2020

Keywords

  • AC line filters
  • electrochemical deposition
  • high frequency response
  • pseudocapacitors
  • ruthenium oxide
  • ultrahigh power density

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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