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Importance of balancing membrane and electrode water in anion exchange membrane fuel cells

Omasta, TJ, Wang, Lianqin, Peng, X, Lewis, CA, Varcoe, John and Mustain, WE (2017) Importance of balancing membrane and electrode water in anion exchange membrane fuel cells Journal of Power Sources, 375. pp. 205-213.

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Abstract

Anion exchange membrane fuel cells (AEMFCs) offer several potential advantages over proton exchange membrane fuel cells (PEMFCs), most notably to overcome the cost barrier that has slowed the growth and large scale implementation of fuel cells for transportation. However, limitations in performance have held back AEMFCs, specifically in the areas of stability, carbonation, and maximum achievable current and power densities. In order for AEMFCs to contend with PEMFCs for market viability, it is necessary to realize a competitive cell performance. This work demonstrates a new benchmark for a H2/O2 AEMFC with a peak power density of 1.4 W cm−2 at 60 °C. This was accomplished by taking a more precise look at balancing necessary membrane hydration while preventing electrode flooding, which somewhat surprisingly can occur both at the anode and the cathode. Specifically, radiation-grafted ETFE-based anion exchange membranes and anion exchange ionomer powder, functionalized with benchmark benzyltrimethylammonium groups, were utilized to examine the effects of the following parameters on AEMFC performance: feed gas flow rate, the use of hydrophobic vs. hydrophilic gas diffusion layers, and gas feed dew points.

Item Type: Article
Subjects : Chemical and Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Omasta, TJUNSPECIFIEDUNSPECIFIED
Wang, Lianqinlianqin.wang@surrey.ac.ukUNSPECIFIED
Peng, XUNSPECIFIEDUNSPECIFIED
Lewis, CAUNSPECIFIEDUNSPECIFIED
Varcoe, JohnJ.Varcoe@surrey.ac.ukUNSPECIFIED
Mustain, WEUNSPECIFIEDUNSPECIFIED
Date : 9 May 2017
Funders : Engineering and Physical Sciences Research Council (EPSRC)
Identification Number : 10.1016/j.jpowsour.2017.05.006
Copyright Disclaimer : © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Anion exchange membrane fuel cell; Water; High performance; Electrode; Flooding
Depositing User : Symplectic Elements
Date Deposited : 11 May 2017 11:08
Last Modified : 12 Dec 2017 12:28
URI: http://epubs.surrey.ac.uk/id/eprint/814151

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