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High performance heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes

Varcoe, John R (2016) High performance heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes [Dataset]

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Item Type: Dataset
Subjects : Materials Chemistry
Principal Investigator :
Principal InvestigatorEmail
Description : Anion-exchange membranes (AEM) containing 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(vinylbenzyl trimethylammonium) AEM. Two AEMs containing heterocyclic-QA head groups were down-selected as they showed 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 methylpiperidinium)- and ETFE-g-poly(vinylbenzyl 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 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 an aQAPS polysulfone ionomer: the 100 µm thick variant (made from 50 µm thick ETFE) yielded peak powder densities of 800 and 630 mW cm-2 (with and without 0.1 MPa back pressurisation, respectively), while a 52 µm thick variant (made 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 use the methylpyrrolidinium head-group in preference to the current de facto benchmark benzyltrimethylammonium head-group.
Dataset Creators :
Varcoe, John
Publication Year of Data : 2016
Publication Date of Paper : 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 : No Restrictions
Data Access Contact :
Data Access ContactEmail
External Data Location : Internal Location
Project Title : High performance heterocyclic benzyl-quaternary ammonium radiation-grafted anion-exchange membranes
Data Format : xls + others
Contributors :
Discipline : Materials Chemistry
Keywords : Anion-exchange membranes; Alkaline Membrane Fuel Cells; Radiation-grafted; hydroxide conductivity; Raman microscopy
Related Links :
Version : 1
Depositing User : Simon Smith
Date Deposited : 04 Jul 2016 09:12
Last Modified : 11 Oct 2016 11:00

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