Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 162, Issue -, Pages 21-26Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2014.06.032
Keywords
Molecular dynamics; Plasma sputtering deposition; Cluster growth; Pt catalyst; Fuel cell electrodes
Funding
- European Commission under the FP7 Fuel Cells and Hydrogen Joint Technology Initiative grant [FP7-2012-JTI-FCH-325327]
- China Scholarship Council [2009 60212]
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Amorphous platinum clusters supported on porous carbon have been envisaged for high-performance fuel cell electrodes. For this application, it is crucial to control the morphology of the Pt layer and the Pt-substrate interaction to maximize activity and stability. We thus investigate the morphology evolution during Pt cluster growth on a porous carbon substrate employing atomic scale molecular dynamics simulations. The simulations are based on the Pt-C interaction potential using parameters derived from density functional theory and are found to yield a Pt cluster morphology similar to that observed in low loaded fuel cell electrodes prepared by plasma sputtering. Moreover, the simulations show amorphous Pt cluster growth in agreement with X-ray diffraction and transmission electron microscopy experiments on high performance low Pt content (10 mu gpt cm(-2)) loaded fuel cell electrodes and provide a fundamental insight in the cluster growth mechanism. (C) 2014 Elsevier B.V. All rights reserved.
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