Durability and stability test of proton exchange membrane fuel cells prepared from polybenzimidazole/poly(tetrafluoro ethylene) composite membrane

It has been reported that a thin polybenzimidazole (PBI)/poly(tetrafluoro ethylene) (PTFE) composite membrane (thickness 25–30 μm) can be prepared by impregnating a thin porous PTFE (thickness 15–20 μm) in a PBI/N,N′-dimethyl actamide (DMAc) solution. In this paper, a 400 h life test of a fuel cell...

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Bibliographic Details
Published inJournal of power sources Vol. 193; no. 1; pp. 170 - 174
Main Authors Lin, H.L., Hsieh, Y.S., Chiu, C.W., Yu, T.L., Chen, L.C.
Format Journal Article Conference Proceeding
LanguageEnglish
Published Amsterdam Elsevier B.V 01.08.2009
Elsevier
Subjects
Applied sciences
Composite membrane
Durability
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cell
Fuel cells
Poly(tetrafluoro ethylene)
Polybenzimidazole
Durability
Poly(tetrafluoro ethylene)
Polybenzimidazole
Fuel cell
Composite membrane
Measurement
Phosphoric acid
Stability
Voltage current curve
Activation
Life test
Time curve
Membrane
Impedance
Performance
Current density
Delamination
Proton exchange membrane fuel cells
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Summary:It has been reported that a thin polybenzimidazole (PBI)/poly(tetrafluoro ethylene) (PTFE) composite membrane (thickness 25–30 μm) can be prepared by impregnating a thin porous PTFE (thickness 15–20 μm) in a PBI/N,N′-dimethyl actamide (DMAc) solution. In this paper, a 400 h life test of a fuel cell prepared from PBI/PTFE composite membrane was carried out at 160 °C with a current density i = 200 mA cm −2. During long time test, the i– V curve and AC-impedance measurements were conducted every 12 h. The experiment data showed a 240 h period of activation. After 240 h the cell voltage started to decay. AC-impedance measurements showed internal resistance ( R s ) and charge transfer resistance ( R c ) decreased in the initial 240 h life test and then R s remained almost constant and R c increased after 240 h. The decay of fuel cell performance can be attributed to the migration of phosphoric acid out from membrane leading to the delamination between membrane and electrodes.
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ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2009.01.062