Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 10, Pages 1436-1438Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.08.002
Keywords
HT-PEFC; Synchrotron X-ray radiography; Membrane electrode assembly (MEA); Phosphoric acid
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In contrast to classical low temperature polymer electrolyte fuel cells (LT-PEFCs), the membrane conductivity in high temperature polymer electrolyte fuel cells (HT-PEFCs) (operating temperature similar to 160 degrees C) is based on proton transport within phosphorus-oxygen acids at different levels of hydration, orthophosphoric acid (H(3)PO(4)) being the simplest example. We present for the first time in-situ synchrotron X-ray radiography measurements applied to a HT-PEFC to gain insight into the local composition of the membrane electrode assembly (MEA) under dynamic operating conditions. Transmission changes during the radiographic measurements exhibit a clear influence of the formation of product water on the membrane composition. (C) 2010 Elsevier B.V. All rights reserved.
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