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Degradation tests of phosphoric acid doped PBI membrane based HT-PEM fuel cells showed performance increase in H2 continuous tests due to ORR kinetic resistance decrease, but start/stop tests and presence of methanol led to increased mass transfer and ohmic resistance.

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System
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Abstract

Degradation tests of two phosphoric acid (PA) doped PBI membrane based HT-PEM fuel cells were reported in this paper to investigate the effects of start/stop and the presence of methanol in the fuel to the performance degradation. Continuous tests with H2 and simulated reformate which was composed of H2, water steam and methanol as the fuel were performed on both single cells. 12-h-startup/12-h-shutdown dynamic tests were performed on the first single cell with pure dry H2 as the fuel and on the second single cell with simulated reformate as the fuel. Along with the tests electrochemical techniques such as polarization curves and electrochemical impedance spectroscopy (EIS) were employed to study the degradation mechanisms of the fuel cells. Both single cells showed an increase in the performance in the H2 continuous tests, because of a decrease in the ORR kinetic resistance probably due to the redistribution of PA between the membrane and electrodes. EIS measurement of first fuel cell during the start/stop test showed that the mass transfer resistance and ohmic resistance increased which can be attributed to the corrosion of carbon support in the catalyst layer and degradation of the PBI membrane. During the continuous test with simulated reformate as the fuel the ORR kinetic resistance and mass transfer resistance of both single cells increased. The performance of the second single cell experienced a slight decrease during the start/stop test with simulated reformate as the fuel.

Key findings

  • Performance increase in H2 continuous tests due to ORR kinetic resistance decrease
  • Increased mass transfer and ohmic resistance in start/stop tests
  • Presence of methanol led to performance degradation

Keywords

Proton exchange membrane fuel cellDielectric spectroscopyCatalytic reformingChemical engineeringCorrosionSteam reforming

Identifiers

DOI
10.1115/fuelcell2014-6358
Journal
ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology
Year
2014