Electrochemical behavior of Ni(II)/Ni in a hydrophobic amide-type room-temperature ionic liquid

Yan Li Zhu, Yukari Kozuma, Yasushi Katayama, Takashi Miura

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Electrochemical reaction of Ni(II)/Ni was investigated in a hydrophobic room-temperature ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) containing Ni(TFSA)2 as a Ni source. The UV-vis spectra showed that Ni(II) in BMPTFSA is octahedrally coordinated with TFSA- anions. The average activation energy for the diffusion coefficients of this Ni(II) complex was ∼26 kJ mol-1, which was close to that for the viscosity. The diffusion coefficient of Ni(II) was estimated to be 9.3 × 10-8 cm2 s-1. Chronoamperometric measurements showed that the electrodeposition of Ni on a platinum substrate involved three-dimensional instantaneous nucleation under diffusion control at room-temperature. The electrodeposits obtained by galvanostatic electrolysis with the current density of -0.046 mA cm-2 at 70 and 100 °C were identified as metallic Ni by XRD.

Original languageEnglish
Pages (from-to)7502-7506
Number of pages5
JournalElectrochimica Acta
Volume54
Issue number28
DOIs
Publication statusPublished - 2009 Dec 1

    Fingerprint

Keywords

  • 1-Butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide
  • Electrodeposition
  • Ionic liquid
  • Nickel
  • Room-temperature molten salt

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Cite this