Enlarging the surface area of an electrolytic capacitor of porous niobium by Mg-Ce eutectic liquid dealloying

Joung Wook Kim, Takeshi Wada, Sung Gyoo Kim, Hidemi Kato

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To increase the surface area while decreasing the ligament size of an Nb anode pellet for use as a capacitor, we added Ce to an Mg melt; the dealloying reaction occurred at temperatures lower than 1023 K, the previously lowest recorded temperature for such a reaction. By analyzing the dealloying kinetics, we found the optimum dealloying conditions to produce a minimum ligament size of 100 nm in the Mg95.7Ce4.3 melt: 923 K for 420 s. Using these conditions, we increased the specific surface area of the Nb anode pellet to 4.3 m2/g, which increased its mass-specific capacitance to 875,000 μFV/g.

Original languageEnglish
Pages (from-to)68-71
Number of pages4
JournalScripta Materialia
Volume122
DOIs
Publication statusPublished - 2016 Sep 1

Keywords

  • Dealloying
  • Electrical properties
  • Kinetics
  • Nanostructure
  • Porous material

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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