Title of Paper:Long-spacer-chain imidazolium functionalized poly(ether ether ketone) as hydroxide exchange membrane for fuel cell

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Date of Publication:2016-09-07

Journal:INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

Included Journals:SCIE、EI、Scopus

Volume:41

Issue:33

Page Number:14982-14990

ISSN No.:0360-3199

Key Words:Anion exchange membrane; Fuel cell; Imidazolium; poly(ether ether ketone)

Abstract:An imidazolium-functionalized poly(ether ether ketone) containing a long spacer chain between imidazolium group and polymer main-chain (PEEK-AeImBr) was synthesized by the reaction of chloromethylated PEEK and self-synthesized 1-Aminoethyl-2,3-dimethylimidazolium bromide. H-1 NMR spectra confirmed the successful synthesis of PEEK-AeImBr. The corresponding PEEK-AeImOH HEM was prepared by casting the PEEK-AeImBr solution and subsequent ion-exchange process. Ion exchange capacity (IEC) of PEEK-AeImOH membranes ranges from 1.50 to 2.07 mmol g(-1) with the degree of chloromethylation from 58% to 92%. Hydroxide conductivity of PEEK-AeImOH membranes increases with increasing IEC. PEEK-AeImOH membrane with IEC of 2.07 mmol g(-1) has the highest conductivity of 48 mS cm(-1). The spacer-modified PEEK-AeImOH membrane maintained good alkali stability at 60 degrees C. The H-2/O-2 single cell with the PEEK-AeImOH membrane exhibits high open circuit voltage of 1.02 V and peak power density of 120 mW cm(-2) at room temperature. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.