Non defect-stabilized thermally stable single-atom catalyst
By Rui Lang, Wei Xi, Jin-Cheng Liu, Yitao Cui, Tianbo Li, A. Lee, Fang Chen, Yang Chen, Lei Li, Lin Li and 9 more. Nature Communications, 2019
615 citations recorded by the source corpus.
Surface-supported isolated atoms in single-atom catalysts (SACs) are usually stabilized by diverse defects. The fabrication of high-metal-loading and thermally stable SACs remains a formidable challenge due to the difficulty of creating high densities of underpinning stable defects. Here we report that isolated Pt atoms can be stabilized through a strong covalent metal-support interaction (CMSI) that is not associated with support defects, yielding a high-loading and thermally stable SAC by trapping either the already deposited Pt atoms or the PtO2 units vaporized from nanoparticles during high-temperature calcination. Experimental and computational modeling studies reveal that iron oxide reducibility is crucial to anchor isolated Pt atoms. The resulting high concentrations of single atoms enable specific activities far exceeding those of conventional nanoparticle catalysts. This non defect-stabilization strategy can be extended to non-reducible supports by simply doping with iron oxide, thus paving a new way for constructing high-loading SACs for diverse industrially important catalytic reactions. Developing stable single-atom catalysts (SACs) with a high metal loading remains a challenge due to the difficulty of creating high densities of defects on support materials. Here the authors prepare Pt SACs with high Pt loadings by virtue of strong covalent metal-support interaction, rather than support defects.
Subfields: Materials Chemistry, Mechanical Engineering, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/7e3bf40810b939a1c4973a709f117c72181923d8
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Citations in the corpus
- Tracking the formation, fate and consequence for catalytic activity of Pt single sites on CeO2 (2020, result): “In case of CH4 oxidation, Pt-SS reached a maximum of 10 % conversion at 500 °C, which is in a similar order of magnitude as that obtained for the Pt single site catalyst supported on Fe2O3.(49) In contrast, the same conversion was measured below 300 °C for Pt-NP and over 90% CH4 oxidation was achiev”