期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 4, 页码 1366-1372出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta09215a
关键词
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资金
- National Natural Science Foundation of China [21301138, 91545110, 21573254]
- Fundamental Research Funds for the Central Universities [xjj2013033]
- Center for Materials Chemistry from Xi'an Jiaotong University
- Youth Innovation Promotion Association Chinese Academy of Sciences
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, & Biosciences (CSGB) Division [DE-SC0002247]
Noble metal/transition metal (hydr) oxide interfaces are often highly active catalytic sites for many oxidation reactions. One of the challenges in such catalyst systems especially in high-temperature reactions is the lack of an effective mechanism to stabilize the catalysts against sintering over time and to maintain the metal/oxide interfaces. Herein, we report an alloying-dealloying process for the production of ultrafine Pt/FeOx nanoconjugates (similar to 1.8 nm) with confinement in silica nanoshells for effective stabilization. The synthesis started with coating of ultrasmall Pt/Fe precursor nanoparticles in reverse micelles by a microporous silica shell, which served as a nanoreactor to allow the subsequent transformation of the precursor nanoparticles into the target Pt/FeOx nanoconjugates. Thanks to the ultrasmall size of the nanoconjugates and their effective protection by the silica shells, the resulting Pt/FeOx@SiO2 yolk/shell nanospheres showed high catalytic activity and remarkable durability in preferential CO oxidation in H-2 (PROX). This synthesis strategy may represent a general approach in rational design of highly stable catalysts with complex nanostructures for a broad range of catalysis.
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