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Issue 24, 2015
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Ammonium-based protic ionic liquid doped Nafion membranes as anhydrous fuel cell electrolytes

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Abstract

Polymer electrolyte membranes doped with Protic Ionic Liquids (PILs) can serve as promising materials for anhydrous proton conduction. In the present study, molecular dynamics simulations are performed to characterize the structure and dynamics of a diethylmethylammonium triflate ([dema][TfO]) PIL doped Nafion membrane at various PIL doping and temperatures. The polymer membrane PIL interface structure shows that the hydrogen bonding interactions predominantly exist between the acidic site (N–H) of the ammonium cation and SO3 group of the [TfO] anion or Nafion. The distribution of the SO3 group (of the [TfO] anion or Nafion) around the ammonium cation increases with PIL concentration. The existence of weak hydrogen bonding interactions between the alkyl hydrogen atoms of the [dema+] and the SO3 group of Nafion remains unaffected by the PIL concentration. An increase in the PIL doping level and temperature results in faster diffusion (higher ionic conductivity) which is in qualitative agreement with experiments.

Graphical abstract: Ammonium-based protic ionic liquid doped Nafion membranes as anhydrous fuel cell electrolytes

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Article information


Submitted
31 Mar 2015
Accepted
13 May 2015
First published
13 May 2015

J. Mater. Chem. A, 2015,3, 12905-12912
Article type
Paper
Author version available

Ammonium-based protic ionic liquid doped Nafion membranes as anhydrous fuel cell electrolytes

A. P. Sunda, J. Mater. Chem. A, 2015, 3, 12905
DOI: 10.1039/C5TA02315G

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