Journal
JOURNAL OF POWER SOURCES
Volume 299, Issue -, Pages 273-279Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.08.104
Keywords
Bipolar membrane fuel cell; Self-humidification; Water management; Non-platinum catalyst; Polymer electrolyte membrane; Anion exchange membrane
Funding
- National Natural Science Foundation of China [U1137602, 51422301]
- National High Technology Research and Development Program of China [2013AA031902]
- National Science Foundation of Beijing, China [2132051]
- Research Fund for the Doctoral Program of Higher Education of China [20131102110036]
- Beihang University
- Innovation Foundation of BUAA for PhD Graduates
- Canada Research Chairs Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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To maintain membrane hydration and operate effectively, polymer electrolyte membrane fuel cells (PEMFCs) require elaborate water management, which significantly increases the complexity and cost of the fuel cell system. Here we propose a novel and entirely different approach to membrane hydration by exploiting the concept of bipolar membranes. Bipolar membrane (BPM) fuel cells utilize a composite membrane consisting of an acidic polymer electrolyte membrane on the anode side and an alkaline electrolyte membrane on the cathode side. We present a novel membrane electrode assembly (MEA) fabrication method and demonstrate experimentally and theoretically that BPM fuel cells can (a) self-humidify to ensure high ionic conductivity; and (b) allow use of non-platinum catalysts due to inherently faster oxygen reduction kinetics on an alkaline cathode. Our Pt-based BPM fuel cell achieves a two orders of magnitude gain in power density of 327 mW cm(-2) at 323 K under dry gas feed, the highest power output achieved under anhydrous operation conditions. A theoretical analysis and in situ measurements are presented to characterize the unique interfacial water generation and transport behavior that make self-humidification possible during operation. Further optimization of these features and advances in fabricating bipolar MEAs would open the way for a new generation of self-humidifying and water-management-free PEMFCs. (C) 2015 Elsevier B.V. All rights reserved.
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