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

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Title
Boosting hot electron flux and catalytic activity at metal-oxide interfaces of PtCo bimetallic nanoparticles
Author(s)
Hyosun Lee; Juhyung Lim; Changhwan Lee; Seoin Back; Kwangjin An; Jae Won Shin; Ryong Ryoo; Yousung Jung; Jeong Young Park
Publication Date
2018-06
Journal
NATURE COMMUNICATIONS, v.9, no.1, pp.2235 -
Publisher
NATURE PUBLISHING GROUP
Abstract
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
URI
https://pr.ibs.re.kr/handle/8788114/5497
ISSN
2041-1723
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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