Boosting hot electron flux and catalytic activity at metal-oxide interfaces of PtCo bimetallic nanoparticles

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Despite numerous studies, the origin of the enhanced catalytic performance of bimetallic nanoparticles (NPs) remains elusive because of the ever-changing surface structures, compositions, and oxidation states of NPs under reaction conditions. An effective strategy for obtaining critical clues for the phenomenon is real-time quantitative detection of hot electrons induced by a chemical reaction on the catalysts. Here, we investigate hot electrons excited on PtCo bimetallic NPs during H-2 oxidation by measuring the chemicurrent on a catalytic nanodiode while changing the Pt composition of the NPs. We reveal that the presence of a CoO/Pt interface enables efficient transport of electrons and higher catalytic activity for PtCo NPs. These results are consistent with theoretical calculations suggesting that lower activation energy and higher exothermicity are required for the reaction at the CoO/Pt interface.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2018-06
Language
English
Article Type
Article
Citation

NATURE COMMUNICATIONS, v.9, pp.2235 - 2242

ISSN
2041-1723
DOI
10.1038/s41467-018-04713-8
URI
http://hdl.handle.net/10203/243692
Appears in Collection
CH-Journal Papers(저널논문)EEW-Journal Papers(저널논문)
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