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Engineering Nanoscale Interfaces of Metal/Oxide Nanowires to Control Catalytic Activity

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Title
Engineering Nanoscale Interfaces of Metal/Oxide Nanowires to Control Catalytic Activity
Author(s)
Hee Chan Song; Gyu Rac Lee; Kiung Jeon; Hyunhwa Lee; Si Woo Lee; Yeon Sik Jung; Jeong Young Park
Publication Date
2020-07
Journal
ACS Nano, v.14, no.7, pp.8335 - 8342
Publisher
American Chemical Society
Abstract
The interfacial effect between a metal catalyst and its various supporting transition metal oxides on the catalytic activity of heterogeneous catalysis has been extensively explored; engineering interfacial sites of metal supported on metal oxide has been found to influence catalytic performance. Here, we investigate the interfacial effect of Pt nanowires (NWs) vertically and alternatingly stacked with titanium dioxide (TiO2) or cobalt monoxide (CoO) NWs, which exhibit a strong metal-support interaction under carbon monoxide (CO) oxidation. High-resolution nanotransfer printing based on nanoscale pattern replication and e-beam evaporation were utilized to obtain the Pt NWs cross-stacked on the CoO or TiO2 NW on the silicon dioxide (SiO2) substrate with varying numbers of nanowires. The morphology and interfacial area were precisely determined by means of atomic force microscopy and scanning electron microscopy. The cross-stacked Pt/TiO2 NW and Pt/CoO NW catalysts were estimated with CO oxidation under 40 Torr CO and 100 Torr O-2 from 200 to 240 degrees C. Higher catalytic activity was found on the Pt/CoO NW catalyst than on Pt/TiO2 NWs and Pt NWs, which indicates the significance of nanoscale metal-oxide interfaces. As the number of nanowire layers increased, the catalytic activity became saturated. Our study demonstrates the interfacial role of nanoscale metal-oxide interfaces under CO oxidation, which has intriguing applications in the smart design of catalytic materials
URI
https://pr.ibs.re.kr/handle/8788114/9014
DOI
10.1021/acsnano.0c02347
ISSN
1936-0851
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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