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An optimised synthesis of high performance, radiation-grafted anion-exchange membranes (Green Chemistry, 2017, 19, 831-843)

Wang, Lianqin (2016) An optimised synthesis of high performance, radiation-grafted anion-exchange membranes (Green Chemistry, 2017, 19, 831-843) [Dataset]

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Item Type: Dataset
Subjects : Materials Chemistry
Divisions : Faculty of Engineering and Physical Sciences
Principal Investigator :
Principal InvestigatorEmail
Description : High performance benzyltrimethylammonium-type alkaline anion-exchange membranes (AEM), for application in electrochemical devices such as anion-exchange membrane fuel cells (AEMFC), were prepared by the radiation grafting (RG) of vinylbenzyl chloride (VBC) onto 25 μm thick poly(ethylene-cotetrafluoroethylene) (ETFE) films followed by amination with trimethylamine. Reductions in the electronbeam absorbed dose and amount of expensive, potentially hazardous VBC were achieved by using water as a diluent (reduced to 30–40 kGy absorbed dose and 5 vol% VBC) instead of the prior state-of-the-art method that used organic propan-2-ol diluent (required 70 kGy dose and 20 vol% VBC monomer). Furthermore, the water from the aqueous grafting mixture was easily separated from the residual monomer (after cooling) and was reused for a further grafting reaction: the resulting AEM exhibited an ion-exchange capacity of 2.1 mmol g−1 (cf. 2.1 mmol g−1 for the AEM made using a fresh grafting mixture). The lower irradiation doses resulted in mechanically stronger RG-AEMs compared to the reference RG-AEM synthesised using the prior state-of-the-art method. A further positive off-shoot of the optimisation process was the discovery that using water as a diluent resulted in an enhanced (i.e. more uniform) distribution of VBC grafts as proven by Raman microscopy and corroborated using EDX analysis: this led to enhancement in the Cl− anion-conductivities (up to 68 mS cm−1 at 80 °C for the optimised fully hydrated RG-AEMs vs. 48 mS cm−1 for the prior state-of-the-art RG-AEM reference). A downselected RG-AEM with an ion-exchange capacity = 2.0 mmol g−1, that was synthesised using the new greener protocol with a 30 kGy electron-beam absorbed dose, led to an exceptional beginning-of-life H2/O2 AEMFC peak power density of 1.16 W cm−2 at 60 °C in a benchmark test using industrial standard Pt-based electrocatalysts and unpressurised gas supplies: this was higher than the 0.91 W cm−1 obtained with the reference RG-AEM (IEC = 1.8 mmol g−1) synthesised using the prior state-of-the-art protocol.
Publication Year of Data : 2016
Publication Date of Paper : 23 November 2016
Creation Dates : 10/08/2016
Funder : EPSRC
DOI : 10.15126/surreydata.00811704
Grant Title : Fuel Cell Technologies for an Ammonia Economy
Access Statement : All of the raw data in this open access (CC-BY) article is freely available (in compliance with EPSRC rules).
Copyright License : CC-BY
Data Access Contact :
Data Access ContactEmail
External Data Location : Internal Location
Project Title : Fuel Cell Technologies for an Ammonia Economy
Data Format : Mostly text and Excel (.xls) formats. Some raw spectra files in proprietary formats).
Contributors :
Discipline : Materials Chemistry
Keywords : Radiation-grafting; anion-exchange membranes; chloride conductivity; alkali membrane fuel cells.
Related Links :
Version : 1.2
Depositing User : Simon Smith
Date Deposited : 15 Aug 2016 08:35
Last Modified : 11 Dec 2018 11:22

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