Controlling the Oxidation State of Pt Single Atoms for Maximizing Catalytic Activity

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Single-atom catalysts (SACs) have emerged as promising materials in heterogeneous catalysis. Previous studies reported controversial results about the relative level in activity for SACs and nanoparticles (NPs). These works have focused on the effect of metal atom arrangement, without considering the oxidation state of the SACs. Here, we immobilized Pt single atoms on defective ceria and controlled the oxidation state of Pt SACs, from highly oxidized (Pt-0: 16.6 at %) to highly metallic states (Pt-0: 83.8 at %). The Pt SACs with controlled oxidation states were then employed for oxidation of CO, CH4, or NO, and their activities compared with those of Pt NPs. The highly oxidized Pt SACs presented poorer activities than Pt NPs, whereas metallic Pt SACs showed higher activities. The Pt SAC reduced at 300 degrees C showed the highest activity for all the oxidations. The Pt SACs with controlled oxidation states revealed a crucial missing link between activity and SACs.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2020-11
Language
English
Article Type
Article
Citation

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.59, no.46, pp.20691 - 20696

ISSN
1433-7851
DOI
10.1002/anie.202009776
URI
http://hdl.handle.net/10203/277506
Appears in Collection
CBE-Journal Papers(저널논문)
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