Voltammetric and physicochemical characterization of hydroxyl- and ether-functionalized onium bis(trifluoromethanesulfonyl)imide ionic liquids

Tzi Yi Wu, Shyh Gang Su, Keng Fu Lin, Yuan Chung Lin, H. Paul Wang, Ming Wei Lin, Shr Tusen Gung, I. Wen Sun

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Several hydroxyl- and ether-functionalized binary task specific ionic liquids (ILs) are prepared, ether-functionalized ILs exhibit higher conductivity and lower viscosity than those of hydroxyl-functionalized ILs, whereas hydroxyl-functionalized ILs show wider potential window than those of ether-functionalized ILs. The correlation between ionic conductivity and viscosity is based on the classical Walden rule; a relatively large deviation of the plots from the ideal Walden line is observed for the ILs without considering the ion size, whereas the deviation decreases significantly when the adjusted Walden plot is adopted. The α values of ILs calculated from the slopes of the Walden plots are compared to those calculated from the ratio of activation energies for viscosity and molar conductivity (E a,Λ/Ea,η). There are very few reports where electrochemically derived activation energy from conductivity and voltammetric characterization are available for comparison, so a key concept of activation energy in electrochemistry could be developed in this paper.

Original languageEnglish
Pages (from-to)7278-7287
Number of pages10
JournalElectrochimica Acta
Volume56
Issue number21
DOIs
Publication statusPublished - 2011 Aug 30

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Electrochemistry

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