期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 43, 页码 36954-36960出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b12192
关键词
ultra-small platinum nanoparticles; hollow titania nanospheres; encapsulation; water-gas shift; size-dependent catalysis
资金
- National Natural Science Foundation of China [21671156, 21301138, 91545110, 21573254]
- Cyrus Tang Foundation
- Ministry of Science and Technology (MOST) [2016YFA0204100]
- Youth Innovation Promotion Association Chinese Academy of Sciences
Ultra-small platinum nanoparticles loaded over titania is a promising catalyst for the low-temperature water gas shift (WGS) reaction and shows the potential to work in a mobile hydrogen fuel cell system. Their precise size engineering (<3 nm) and reliable stabilization remain challenging. To address these issues, we report a reverse-micelle synthesis approach, which affords uniform ultra-small platinum nano particles (tunable in similar to 1.0-2.6 nm) encapsulated in hollow titania nanospheres with a shell thickness of only similar to 3-5 nm and an overall diameter of only similar to 32 nm. The Pt@TiO2 yolk/shell nanostructured catalysts display extraordinary stability and monotonically increasing activity with the decreasing size of the Pt nanoparticles in the WGS. The size-dependent variation in the electronic property of the Pt nanoparticles and the reducible oxide encapsulation that prevents the Pt nanoparticles from sintering are ascribed as the main reasons for the excellent catalytic performance.
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