Electric charging/discharging characteristics of super capacitor, using de-alloying and anodic oxidized Ti-Ni-Si amorphous alloy ribbons

Mikio Fukuhara, Kazuyuki Sugawara

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Charging/discharging behaviors of de-alloyed and anodic oxidized Ti-Ni-Si amorphous alloy ribbons were measured as a function of current between 10 pA and 100 mA, using galvanostatic charge/discharging method. In sharp contrast to conventional electric double layer capacitor (EDLC), discharging behaviors for voltage under constant currents of 1, 10 and 100 mA after 1.8 ks charging at 100 mA show parabolic decrease, demonstrating direct electric storage without solvents. The supercapacitors, devices that store electric charge on their amorphous TiO2-x surfaces that contain many 70-nm sized cavities, show the Ragone plot which locates at lower energy density region near the 2nd cells, and RC constant of 800 s (at 1 mHz), which is 157,000 times larger than that (5 ms) in EDLC.

Original languageEnglish
Article number253
Pages (from-to)1-6
Number of pages6
JournalNanoscale Research Letters
Volume9
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Electric storage devices
  • Nanometer sized cavity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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