Beyond catalysis and membranes: visualizing and solving the challenge of electrode water accumulation and flooding in AEMFCs
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- Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering; Univ. of Connecticut, Storrs, CT (United States). Dept. of Chemical and Biomolecular Engineering
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Univ. of Connecticut, Storrs, CT (United States). Dept. of Chemical and Biomolecular Engineering
- Univ. of Surrey, Guildford (United Kingdom). Dept. of Chemistry
- Department of Chemical Engineering; University of South Carolina; Columbia; USA; Department of Chemical & Biomolecular Engineering
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 article, 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.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Zhejiang Univ., Hangzhou (China); Univ. of Surrey, Guildford (United Kingdom); Engineering and Physical Sciences Research Council (EPSRC)
- Grant/Contract Number:
- AC36-08GO28308; SC0010531; AI01-01EE50660; EP/M014371/1
- OSTI ID:
- 1422637
- Alternate ID(s):
- OSTI ID: 1432604
- Report Number(s):
- NREL/JA-5500-71277; EESNBY
- Journal Information:
- Energy & Environmental Science, Journal Name: Energy & Environmental Science Vol. 11 Journal Issue: 3; ISSN 1754-5692
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
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