Skip to content

Research at St Andrews

Influence of electrolytes of Li salts, EMIMBF4 and mixed phases on electrochemical and physical properties of Nafion membrane

Research output: Contribution to journalArticle

DOI

Author(s)

Maryam Safari, Leila Naji, Richard T. Baker, Faramarz Afshar Taromi

School/Research organisations

Abstract

Electrolyte-soaked Nafion is commonly used as an ionic polymer in soft actuators. Here, a multi-technique investigation was applied to correlate the electrochemical behavior of Nafion membranes with their microstructures and nanostructures as a function of electrolyte type. The influence of electrolytes of Li salts with different counteranions on the Nafion membranes was investigated in terms of hydration level, structure (using X-ray diffraction and small angle X-ray scattering), stress–strain characteristics, and electrochemical behavior (by cyclic voltammetery and electrochemical impedance spectroscopy). The effects of using ionic liquid (IL), as the electrolyte, addition of different supporting solvent and the addition of Li+ ions to water-free IL-soaked membranes on the structural and electrochemical properties of Nafion were examined. The nano- and microstructure of the Nafion changed considerably as a function of the identity of the electrolyte solution. The electrochemical behavior of the IL-soaked samples was compared with that of the water-soaked Li+-exchanged Nafion. It was seen that the ionic conductivity of the Nafion membranes was reduced significantly when water was replaced by pure IL. Using the supporting solvents increased the conductivity of IL-soaked Nafion membranes dramatically. The presence of a small amount of Li+ ions together with the IL ions caused a significant decrease in charge transfer resistance and increases in double layer capacitance and in ionic conductivity over that of the water-free sample and also over water-soaked Li+-exchanged Nafion. These findings can be useful to improve the knowledge on Nafion's microstructure and also to improve the electromechanical behavior of Nafion-based ionic polymer–metal composites actuators.
Close

Details

Original languageEnglish
Article number45239
JournalJournal of Applied Polymer Science
Volume134
Issue number35
Early online date22 May 2017
DOIs
StatePublished - 15 Sep 2017

    Research areas

  • Electrochemical studies, EMIMBF4, Li salts, Nafion membrane

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3 − δ cathode material for SOFCs

    Vidal, K., Larrañaga, A., Morán-Ruiz, A., Laguna-Bercero, M. A., Baker, R. T. & Arriortua, M. I. 13 Sep 2017 In : Powder Technology. In press

    Research output: Contribution to journalArticle

  2. Acetylene hydrogenation over structured Au-Pd catalysts

    McCue, A. J., Baker, R. & Anderson, J. A. 1 Jul 2016 In : Faraday Discussions. 188, p. 449-523 25 p.

    Research output: Contribution to journalArticle

  3. Visualisation of single atom dynamics in water gas shift reaction for hydrogen generation

    Gai, P. L., Yoshida, K., Ward, M. R., Walsh, M., Baker, R., van der Water, L., Watson, M. J. & Boyes, E. D. 13 Nov 2015 In : Catalysis Science & Technology.

    Research output: Contribution to journalArticle

  4. The enhancement effect of lithium ions on actuation performance of ionic liquid-based IPMC soft actuators

    Safari, M., Naji, L., Baker, R. & Taromi, F. A. 12 Oct 2015 In : Polymer. 76, p. 140-149 10 p.

    Research output: Contribution to journalArticle

  5. Structural characterisation of printable noble metal/poly(vinyl-alcohol) nanocomposites for optical applications

    Hourd, A., Baker, R. T. & Abdolvand, A. 28 Aug 2015 In : Nanoscale. 7, 32, p. 13537-13546 10 p.

    Research output: Contribution to journalArticle

ID: 250163630