Effect of Phosphoric Acid Amount in the PBI-Based Polymer Electrolyte Membrane of High Temperature PEMFCs

Title
Effect of Phosphoric Acid Amount in the PBI-Based Polymer Electrolyte Membrane of High Temperature PEMFCs
Authors
김수진박희영한준영이병석김형준조은애유성종헨켄스마이어디억남석우김성현장종현
Keywords
High temperature-polymer electrolyte membrane fuel cell; Phosphoric acid amount; Single cell; Performance
Issue Date
2014-09
Publisher
17th Solid State Protonic Conductors
Abstract
The high-temperature proton exchange membrane fuel cells (HT-PEMFCs), where operating temperature is between 120 and 180oC, is expected to provide higher CO tolerance and simplified system. Conventionally, polybenzimidazole (PBI) membranes with phosphoric acid (PA) doping are utilized as polymer electrolytes. In general, with higher PA amount, the proton conductivity increases, at the expense of the mechanical stability. The initial PA amount in electrolytes can also affect the electrode characteristics, as significant amount of phosphoric acid can be diffused from PBI membranes to porous electrodes during cell assembly and operation. If the resultant PA amount in electrodes is very small or large, the Pt utilization is expected to be decreased by poor proton conductivity or gas transportation, respectively. In this study, the initial PA amount in PBI/PA membranes were controlled, and its effects on HT-PEMFC characteristics were analysed by electrochemical techniques, such as polarization curves and electrochemical impedance spectroscopy (EIS).
URI
http://pubs.kist.re.kr/handle/201004/48222
Appears in Collections:
KIST Publication > Conference Paper
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