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Beyond Catalysis and Membranes: Visualizing and Solving the Electrode Water Challenge in AEMFCs



Daniel S. Hussey, Travis J. Omasta, Andrew M. Park, Jacob M. LaManna, Yufeng Zheng, Xiong Peng, Lianqin Wang, David L. Jacobson, John R. Varcoe, Bryan S. Pivovar, William E. Mustain


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 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.
Energy and Environmental Science


Anion exchange membrane fuel cell, neutron imaging


, D. , Omasta, T. , Park, A. , LaManna, J. , Zheng, Y. , Peng, X. , Wang, L. , Jacobson, D. , Varcoe, J. , Pivovar, B. and Mustain, W. (2018), Beyond Catalysis and Membranes: Visualizing and Solving the Electrode Water Challenge in AEMFCs, Energy and Environmental Science, [online], (Accessed June 20, 2024)


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Created February 8, 2018, Updated December 23, 2019