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

Hyosun Lee, Juhyung Lim, Changhwan Lee, Seoin Back, Kwangjin An, Jae Won Shin, Ryong Ryoo, Yousung Jung, Jeong Young Park

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

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 H2 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.

Original languageEnglish
Article number2235
JournalNature Communications
Volume9
Issue number1
DOIs
StatePublished - 1 Dec 2018

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