Effect of storage time on the ionic conductivity of chitosan-solid polymer electrolytes incorporating cyano-based ionic liquids

Rita Leones, Rodrigo C. Sabadini, José M.S.S. Esperança, Agnieszka Pawlicka, M. Manuela Silva

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Four solid polymer electrolytes (SPEs) of chitosan-based host matrix were prepared by solvent casting method. The SPEs incorporated 1-ethyl-3-methylimidazolium thiocyanate ([C2mim][SCN]), 1-ethyl-3-methylimidazolium dicyanamide ([C2mim][N(CN)2]), 1-ethyl-3-methylimidazolium tricyanomethanide ([C2mim][C(CN)3]), and 1-butyl-3-methylimidazolium thiocyanate ([C4mim][SCN]). The structure, morphology, thermal behavior, and electrochemical properties of the synthesized free-standing transparent membranes were studied. It was verified that all the samples are amorphous and thermally stable. TGA of chitosan[C2mim][N(CN)2] membrane showed a Tonset of ca. 100 °C (232 °C) higher than the Tonset of the chitosan matrix (135 °C), highlighting the ionic liquids (ILs) stabilizing effect on the polymer host. The highest ionic conductivity was exhibited by chitosan[C2mim][SCN] with 1.61 × 10–3 S cm-1 at 25 °C and 1.28 × 10–2 S cm-1 at 100 °C. Two years later these ionic conductivity values were still very high (>10–4 S cm-1) and adequate for application in solid-state electrochemical devices (ECDs). Such results attest to the samples long shelf-life, proving that these chitosan[Cnmim][X(CN)m] SPEs are time stable, and thus may easily find practical applications.

Original languageEnglish
Pages (from-to)22-29
Number of pages8
JournalElectrochimica Acta
Volume232
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • chitosan
  • cyano-based ILs
  • ionic liquid
  • solid polymer electrolyte
  • storage time

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