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Performance and stability studies of PtCr/C alloy catalysts for oxygen reduction reaction in low temperature fuel cells

Title
Performance and stability studies of PtCr/C alloy catalysts for oxygen reduction reaction in low temperature fuel cells
Authors
Min, M[Min, Myoungki]Kim, H[Kim, Hasuck]
DGIST Authors
Kim, H[Kim, Hasuck]
Issue Date
2016-10-19
Citation
International Journal of Hydrogen Energy, 41(39), 17557-17566
Type
Article
Article Type
Article
Keywords
Accelerated StressAlloy EffectCatalystsElectrolytic ReductionFuel CellsIncipient Wetness MethodLow Temperature Fuel CellsOxygen ReductionOxygen Reduction ReactionParticle SizeParticle Size EffectPlatinum AlloysProton ConductivityStabilityStability TestStability TestsTemperature
ISSN
0360-3199
Abstract
In order to elucidate the reasons for enhanced activity and stability of the alloy catalyst, PtCr/C was prepared by an incipient wetness method and heat-treatments. In single-cell test, the catalysts heat-treated at 900 °C showed the highest performance (about 70% higher than JM Pt/C at 700 mV) because of the alloy effect. Stability of the alloy catalysts was investigated with several accelerated-stress tests. The heavy dissolution of Cr was observed especially in the beginning of operation. The undissolved Cr is considered to take part in the formation of complete alloying. Before and after cell operation, the ratio of Cr to S in the Nafion membrane was measured by EPMA. Within Cr/S of 10% in the Nafion membrane, the conductivity changed a little, but as the Cr/S exceeded more than 10% the serious reduction of conductivity was observed. The catalyst heat-treated at 900 °C showed applicable performance and stability in real cell operations. © 2016 Hydrogen Energy Publications LLC
URI
http://hdl.handle.net/20.500.11750/2168
DOI
10.1016/j.ijhydene.2016.07.175
Publisher
Elsevier Ltd
Files:
There are no files associated with this item.
Collection:
Energy Science and EngineeringETC1. Journal Articles


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