Gallastegui, Antonela;
Foglia, Fabrizia;
McMillan, Paul F;
Casado, Nerea;
Gueguen, Aurelie;
Mecerreyes, David;
(2023)
Poly(diallylmethylammonium) proton conducting membranes with high ionic conductivity at intermediate temperatures.
Polymer
, 280
, Article 126064. 10.1016/j.polymer.2023.126064.
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Abstract
High temperature proton exchange membrane fuel cells are being lately investigated because of their high energy efficiency, their superior heat/water management, CO tolerance, and electrode reaction kinetics. To further advance this technology, the polymer membrane portfolio and performance should be improved for intermediate or high temperature operation (>100 °C). In this work we present new poly(diallylmethylammonium) proton conducting membranes with high ionic conductivity at 120 °C. First, new protic ionic liquids, hereafter called DAMAH+X−, were synthesized leading to diallylmethylammonium monomers with different counter-anions. By radical cyclopolymerization through thermal and photoinitiation mechanisms, self-standing protic polymeric membranes of poly(diallylmethylammonium X−) were obtained. Membranes showed good thermal stability (>250 °C) and mechanical properties without the need of additives such as (protic) ionic liquids, solvents or inorganic charges. Great attention was paid to understand the effect of the different counter-anions on the membrane properties. As a general trend, fluorinated anions coming from strong acids confer high ionic conductivity and allow to reduce the hygroscopic properties on the protic polymeric membranes. Proton structural and dynamical stability at different temperatures and humidification conditions were investigated by Neutron Scattering (QENS and NR). The optimized poly(diallylmethylammonium X−) shows similar ionic conductivity values than Nafion 212 under varying relative humidity conditions at 80 °C. Furthermore, it shows a high ionic conductivity value of 1.9 × 10−3 S cm−1 at 120 °C under dry conditions.
| Type: | Article |
|---|---|
| Title: | Poly(diallylmethylammonium) proton conducting membranes with high ionic conductivity at intermediate temperatures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.polymer.2023.126064 |
| Publisher version: | https://doi.org/10.1016/j.polymer.2023.126064 |
| Language: | English |
| Additional information: | © 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). |
| Keywords: | Protic ionic liquids, Diallylmethylammonium polymers, Proton conducting membranes, PEM, Hydrogen fuel cells |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10171854 |
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