Investigating the electrochemical windows of ionic liquids

Maan Hayyan, Farouq S. Mjalli, Mohd Ali Hashim, Inas M. AlNashef, Tan Xue Mei

Research output: Contribution to journalArticlepeer-review

236 Scopus citations

Abstract

The structure effect on the electrochemical windows (EWs) was studied using cyclic voltammetry (CV) in 16 ionic liquids (ILs), consisting of various cations such as piperidinium, pyridinium, pyrrolidinium, phosphonium, morpholinium, ammonium, sulfonium and imidazolium, and anions including bis(trifluoromethylsulfonyl)imide, tris(pentafluoroethyl)trifluorophosphate, dicyanamide, trifluoroacetate and trifluoromethanesulfonate. It was found that all studied ILs have good EWs to be utilized as electrolytes in different electrochemical applications pertaining to industry. Furthermore, it was found that the structure of ILs affected the EW and both the cation and anion have important effect on the reductive and oxidative limits, respectively. The reductive limits of the studied ILs were found to follow the sequence of [P14,666]+>[N112,1O2]+>[HMPyrr]+>[BMPyrr]+>[EMIm]+>[MOEMMor]+≈[MOPMPip]+>[S222]+>[BMPy]+≈[HPy]+≈[HPPy]+. The oxidative limits were found to follow the sequence of [TFSI]->[TPTP]->[TfO]->[DCA]->[TFA]-.

Original languageBritish English
Pages (from-to)106-112
Number of pages7
JournalJournal of Industrial and Engineering Chemistry
Volume19
Issue number1
DOIs
StatePublished - 25 Jan 2013

Keywords

  • Ag/AgCl electrode
  • Cut-off current
  • Cyclic voltammetry
  • Electrochemical window
  • Glassy carbon macro-electrode
  • Ionic liquid

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