High performance aliphatic-heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes
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Ponce-Gonzalez, Julia (2016) High performance aliphatic-heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes [Dataset]
Full text not available from this repository.| Item Type: | Dataset | ||||||||
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| Subjects : | Materials Chemistry | ||||||||
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| Description : | Anion-exchange membranes (AEM) containing saturated-heterocyclic benzyl-quaternary ammonium (QA) groups synthesised by radiation-grafting onto poly(ethylene-co-tetrafluoroethylene) (ETFE) films are reported. The relative properties of these AEMs are compared with the benchmark radiation-grafted ETFE-g-poly(vinylbenzyltrimethylammonium) AEM. Two AEMs containing heterocyclic-QA head groups were down-selected with higher relative stabilities in aqueous KOH (1 mol dm-3) at 80°C (compared to the benchmark): these 100 µm thick (fully hydrated) ETFE-g-poly(vinylbenzyl-N-methylpiperidinium)- and ETFE-g-poly(vinylbenzyl-N-methylpyrrolidinium)-based AEMs had as-synthesised ion-exchange capacities (IEC) of 1.64 and 1.66 mmol g-1, respectively, which reduced to 1.36 mmol dm-3 (ca. 17 – 18% loss of IEC) after alkali ageing (the benchmark AEM showed 30% loss of IEC under the same conditions). These down-selected AEMs exhibited as-synthesised Cl- ion conductivities of 49 and 52 mS cm-1, respectively, at 90°C in a 95% relative humidity atmosphere, while the OH- forms exhibited conductivities of 138 and 159 mS cm-1, respectively, at 80°C in a 95% relative humidity atmosphere. The ETFE-g-poly(vinylbenzyl-N-methylpyrrolidinium)-based AEM produced the highest performances when tested as catalyst coated membranes in H2/O2 alkaline polymer electrolyte fuel cells at 60°C with PtRu/C anodes, Pt/C cathodes, and a polysulfone ionomer: the 100 µm thick variant (synthesised from 50 µm thick ETFE) yielded peak power densities of 800 and 630 mW cm-2 (with and without 0.1 MPa back pressurisation, respectively), while a 52 µm thick variant (synthesised from 25 µm thick ETFE) yielded 980 and 800 mW cm-2 under the same conditions. From these results, we make the recommendation that developers of AEMs, especially pendent benzyl-QA types, should consider the benzyl-N-methylpyrrolidinium head-group as an improvement to the current de facto benchmark benzyltrimethylammonium head-group. | ||||||||
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| Publication Year of Data : | 2016 | ||||||||
| Publication Date of Paper : | November 2016 | ||||||||
| Creation Dates : | 2016 | ||||||||
| Funder : | EPSRC | ||||||||
| Identification Number : | 10.15126/surreydata.00811096 | ||||||||
| Grant Title : | Temperature and Alkali Stable Polymer Electrolytes for Hydrogen and Carbon Dioxide Alkaline Electrolysers. | ||||||||
| Access Statement : | All of the raw data collected at Surrey is freely available (in compliance with EPSRC rules): the metadata and details on how to access this raw data can be found at DOI: 10.15126/surreydata.00811096. | ||||||||
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| External Data Location : | Internal Location | ||||||||
| Project Title : | High performance aliphatic-heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes | ||||||||
| Data Format : | xls + raw spectral files | ||||||||
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| Discipline : | Materials Chemistry | ||||||||
| Keywords : | Anion-exchange membranes; Alkaline Membrane Fuel Cells; Radiation-grafted; Hydroxide conductivity; Raman microscopy | ||||||||
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| Version : | 2.0 PUBLISHED | ||||||||
| Depositing User : | Simon Smith | ||||||||
| Date Deposited : | 04 Jul 2016 09:12 | ||||||||
| Last Modified : | 17 May 2017 14:25 | ||||||||
| URI: | http://epubs.surrey.ac.uk/id/eprint/811096 |
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