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Journal Article

Degradation Mechanisms of Pt/C Fuel Cell Catalysts under Simulated Start-Stop Conditions

MPS-Authors

Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

Galeano,  Carolina
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Schüth, F., Meier, J. C., Katsounaros, I., Topalov, A. A., Kostka, A., Mayrhofer, K. J., et al. (2012). Degradation Mechanisms of Pt/C Fuel Cell Catalysts under Simulated Start-Stop Conditions. ACS Catalysis, (5), 832-843. doi:10.1021/cs300024h.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-4895-8
Abstract
This manuscript investigates the degrdn. of a Pt/Vulcan fuel cell catalyst under simulated start-stop conditions in an electrochem. half-cell. Identical location transmission electron microscopy is used to visualize the several different degrdn. pathways occurring on the same catalyst material under potential cycling conditions. The complexity of degrdn. on the nanoscale leading to macroscopic active surface area loss is demonstrated and discussed. Namely, four different degrdn. pathways at one single Pt/Vulcan aggregate are clearly obsd. Furthermore, inhomogeneous degrdn. behavior for different catalyst locations is shown, and trends in degrdn. mechanisms related to the platinum particle size are discussed. Attention is drawn to the vast field of parameters influencing catalyst stability. We also present the development of a new technique to study changes of the catalyst not only with two-dimensional projections of std. transmission electron microscopy images but also in three dimensions. For this purpose, identical location tomog. is introduced, which visualizes the three-dimensional structure of an identical catalyst location before and after degrdn.