期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 39, 页码 10525-10530出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201402342
关键词
ceria nanoparticles; density functional calculations; heterogeneous catalysis; model catalyst; platinum
资金
- EU (FP7 NMP project ChipCAT) [310191]
- EU (COST Action) [CM1104]
- Spanish MINECO [CTQ2012-34969, CTQ2012-30751, FIS2008-02238]
- MICINN [BES-2009-021571]
- French ANR within IMAGINOXE project [ANR-11-JS10-001]
- Czech Science Foundation [P204/11/1183, 13-10396S]
- Alexander von Humboldt Foundation
- ICREA Academia Award for Excellence in University Research
- Deutsche Forschungsgemeinschaft (DFG) within the Excellence Cluster Engineering of Advanced Materials in the framework of the excellence initiative
- Czech Ministry of Education [LG12003]
- ICREA Funding Source: Custom
Platinum is the most versatile element in catalysis, but it is rare and its high price limits large-scale applications, for example in fuel-cell technology. Still, conventional catalysts use only a small fraction of the Pt content, that is, those atoms located at the catalyst's surface. To maximize the noble-metal efficiency, the precious metal should be atomically dispersed and exclusively located within the outermost surface layer of the material. Such atomically dispersed Pt surface species can indeed be prepared with exceptionally high stability. Using DFT calculations we identify a specific structural element, a ceria nanopocket, which binds Pt2+ so strongly that it withstands sintering and bulk diffusion. On model catalysts we experimentally confirm the theoretically predicted stability, and on real Pt-CeO2 nanocomposites showing high Pt efficiency in fuel-cell catalysis we also identify these anchoring sites.
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