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

Galeano Nunez, D. C., Katsounarus, I., Topalov, A., Kostka, A., Meier, J., Mayrhofer, K., et al. (2012). Degradation Mechanisms of Pt/C Fuel Cell Catalysts under Simulated Start-Stop Conditions. ACS Catalysis, 2(5), 832-843. doi:10.1021/cs300024h.

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Galeano Nunez, Diana Carolina1, Author           
Katsounarus, Ioannis2, 3, Author
Topalov, Angel2, 3, 4, Author
Kostka, Alexander, Author
Meier, Josef2, 3, 4, Author
Mayrhofer, Karl2, 3, Author
Schüth, Ferdi1, Author           
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, ou_1445589              
2Max Planck Inst Eisenforsch GmbH, Dept Interface Chem & Surface Engn, , D-40237 Dusseldorf, Germany , ou_persistent22              
3Max Planck Inst Eisenforsch GmbH, Dept Microstruct Phys & Alloy Design, , D-40237 Dusseldorf, Germany, ou_persistent22              
4Ruhr Univ Bochum, Ctr Electrochem Sci, D-44780 Bochum, Germany , ou_persistent22              

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 Abstract: This manuscript investigates the degradation of a Pt/Vulcan fuel cell catalyst under simulated start stop conditions in an electrochemical half-cell. Identical location transmission electron microscopy (IL-TEM) is used to visualize the several different degradation pathways occurring on the same catalyst material under potential cycling conditions. The complexity of degradation on the nanoscale leading to macroscopic active surface area loss is demonstrated and discussed. Namely, four different degradation pathways at one single Pt/Vulcan aggregate are clearly observed. Furthermore, inhomogeneous degradation behavior for different catalyst locations is shown, and trends in degradation mechanisms related to the platinum particle size are discussed in brief. 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 2D projections of standard TEM images but also in 3D. For this purpose, identical location tomography (IL-tomography) is introduced, which visualizes the 3D structure of an identical catalyst location before and after degradation.

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 Dates: 2012-05-01
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/cs300024h
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Title: ACS Catalysis
Source Genre: Journal
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Pages: - Volume / Issue: 2 (5) Sequence Number: - Start / End Page: 832 - 843 Identifier: -