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Title:
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The stability of PEMFC electrodes: Platinum dissolution versus potential and temperature investigated by Quartz Crystal Microbalance
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Author(s):
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Published by:
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Publication date:
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ECN
Hydrogen and Clean Fossil Fuels
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26-1-2007
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ECN report number:
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Document type:
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ECN-W--07-010
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Article (scientific)
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Number of pages:
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24
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Published in: Journal of the Electrochemical Society (ECS), , 2007, Vol.154(5), p.494-499.
Abstract:
The stability of platinum in PEM fuel cell electrodes has been investigated by determining the dissolution of platinum from a thin platinum film deposited on a gold substrate in 1M HClO4 at different temperatures ranging between 40 and 80°C and potentials between 0.85 and 1.4 V vs. RHE. The loss of Pt during the dissolution process is monitored in-situ with the highly sensitive quartz crystal microbalance. By combination of the microbalance with the electrochemical cell, the dynamic change of the electrode weight can be observed in-situ. It is shown that first an oxide layer is formed, which can be dissolved depending on temperature and potential.
The dissolution rate is found to be strongly dependent on the potential and temperature. At a potential close to 1.15 V vs. RHE, the dissolution rate becomes saturated at 80°C due to the protection of a passivating surface platinum oxide layer at high potential. At 80 °C, the dissolution rate starts to diminish when the potential is higher than 1.15V.
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