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Beyond catalysis and membranes: visualizing and solving the challenge of electrode water accumulation and flooding in AEMFCs

Omasta, T, Park, A, LaManna, J, Zhang, Y, Wang, Lianqin, Jacobson, D, Varcoe, John and Hussey, D (2018) Beyond catalysis and membranes: visualizing and solving the challenge of electrode water accumulation and flooding in AEMFCs Energy and Environmental Science, 11. pp. 551-558.

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Abstract

A majority of anion exchange membrane fuel cells (AEMFCs) reported in the literature have been unable to achieve high current or power. A recently proposed theory is that the achievable current is largely limited by poorly balanced water during cell operation. In this work, we present convincing experimental results – coupling operando electrochemical measurements and neutron imaging – supporting this theory and allowing the amount and distribution of water, and its impact on AEMFC performance, to be quantified for the first time. We also create new electrode compositions by systematically manipulating the ionomer and carbon content in the anode catalyst layer, which allowed us to alleviate the mass transport behavior limitations of H2/O2 AEMFCs and achieve a new record-setting peak power density of 1.9 W cm−2 – a step-change to existing literature. Our efforts cast a new light on the design and optimization of AEMFCs – potentially changing the way that AEMFCs are constructed and operated.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
NameEmailORCID
Omasta, T
Park, A
LaManna, J
Zhang, Y
Wang, Lianqinlianqin.wang@surrey.ac.uk
Jacobson, D
Varcoe, JohnJ.Varcoe@surrey.ac.uk
Hussey, D
Date : 8 February 2018
Funders : EPSRC
Identification Number : 10.1039/C8EE00122G
Copyright Disclaimer : This is an Open Access article published by the Royal Society of Chemistry under a Creative COmmons Attribution 3.0 Unported License
Depositing User : Melanie Hughes
Date Deposited : 15 Mar 2018 10:12
Last Modified : 15 Mar 2018 10:12
URI: http://epubs.surrey.ac.uk/id/eprint/846034

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