期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201904278
关键词
amorphous; CO oxidation; Fe2O3; Pt; single atom
类别
资金
- National Key R&D Program of China [2017YFB0406000]
- National Science Foundation of China [51521004, 51420105009, 51602196, 21875137]
- Zhi-Yuan Endowed fund
- National Science Foundation [CBET-1159240]
- School of Engineering at University of California, Irvine
- thousand talents program for distinguished young scholars from Chinese government
- Center of Hydrogen Science
- Joint research center for clean energy materials from Shanghai Jiao Tong University
Platinum-based catalysts are critical to several chemical processes, but their efficiency is not satisfying enough in some cases, because only the surface active-site atoms participate in the reaction. Henceforth, catalysts with single-atom dispersions are highly desirable to maximize their mass efficiency, but fabricating these structures using a controllable method is still challenging. Most previous studies have focused on crystalline materials. However, amorphous materials may have enhanced performance due to their distorted and isotropic nature with numerous defects. Here reported is the facile synthesis of an atomically dispersed catalyst that consists of single Pt atoms and amorphous Fe2O3 nanosheets. Rational control can regulate the morphology from single atom clusters to sub-nanoparticles. Density functional theory calculations show the synergistic effect resulted from the strong binding and stabilization of single Pt atoms with the strong metal-support interaction between the in situ locally anchored Pt atoms and Fe2O3 lead to a weak CO adsorption. Moreover, the distorted amorphous Fe2O3 with O vacancies is beneficial for the activation of O-2, which further facilitates CO oxidation on nearby Pt sites or interface sites between Pt and Fe2O3, resulting in the extremely high performance for CO oxidation of the atomic catalyst.
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