Evaluation of the Cell Performance and Load Cycle Durability for Membrane Electrode Assemblies Using Pt/Nb-SnO2 Cathode Catalyst Layers with Various Ionomer Contents

2017 ◽  
Keyword(s):  
Load Cycle ◽  
Cell Performance ◽  
Membrane Electrode ◽  
Cathode Catalyst ◽  
Catalyst Layers ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies

Fuel Cell Characteristics of the Membrane Electrode Assemblies using Phosphoric Acid-doped Poly[2,2’-(p-oxydiphenylene)-5,5’-bibenzimidazole] Membranes

2011 ◽  
Vol 14 (3) ◽  
pp. 159-165
Author(s):  
Liang Fang ◽  
Li Sheng ◽  
Xiaoxia Guo ◽  
Jianhua Fang ◽  
Zi-Feng Ma
Keyword(s):  
Molecular Weight ◽  
Phosphoric Acid ◽  
Electrochemical Impedance ◽  
Polymer Electrolyte Membrane ◽  
Constant Current ◽  
Temperature Cycle ◽  
Membrane Electrode ◽  
Catalyst Layers ◽  
Membrane Electrode Assemblies ◽  
Electrode Assemblies

The membrane electrode assemblies (MEAs) based on phosphoric acid (PA)-doped poly[2,2’-(p-oxydiphenylene)-5,5’-bibenzimidazole] (OPBI) membranes were prepared for the high temperature polymer electrolyte membrane fuel cells, and the moderate molecular weight poly[2,2’-(m-phenylene)-5,5’-bibenzimidazole] (mPBI) with good solubility in aprotic solvents was synthesized and utilized as the binder in catalyst layers for the first time. The hot press and the components in catalyst layers that affected the performances of MEAs were studied. The cell performance evaluation and electrochemical impedance spectroscopy were carried out at temperatures ranging from 80 to 160 °C in a single cell setup. It was found that the prepared OPBI and the moderate molecular weight mPBI with high solubilities of polybenzimidazole could facilitate and simplify the preparation of MEAs. The novel MEAs using the PA-doped OPBI membranes and moderate molecular weight mPBI exhibited good performances in the polarization tests, constant current tests, and temperature cycle tests, which were comparable with those traditional MEAs using the PA-doped mPBI.

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