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A tailored oxide interface creates dense Pt single-atom catalysts with high catalytic activity

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Title
A tailored oxide interface creates dense Pt single-atom catalysts with high catalytic activity
Author(s)
Mi Yoo; Young-Sang Yu; Hyunwoo Ha; Siwon Lee; Jin-Seok Choi; Sunyoung Oh; Eunji Kang; Hyuk Choi; Hyesung An; Kug-Seung Lee; Jeong Young Park; Richard Celestre; Matthew A. Marcus; Kasra Nowrouzi; Doug Taube; David A. Shapiro; WooChul Jung; Chunjoong Kim; Hyun You Kim
Publication Date
2020-04
Journal
ENERGY & ENVIRONMENTAL SCIENCE, v.13, no.4, pp.1231 - 1239
Publisher
ROYAL SOC CHEMISTRY
Abstract
Highly reactive dense Pt single-atoms stabilized on an oxide support can resolve a grand challenge in the economic use of Pt in catalysis. The maximized number density of reaction sites provided by dense Pt single-atoms guarantees the improved catalytic performance of Pt combined with high efficiency. By manipulating the chemical nature of multi-component interfaces, we synthesized CO-tolerant dense Pt single-atoms highly reactive for the CO oxidation reaction, which governs the key steps for chemical energy conversion and emission control. The addition of 1 wt% of Ce to TiO2 support particles creates a CeOx–TiO2 interface that stabilizes Pt single-atoms by strong electronic interactions. Dense Pt singleatoms formed on CeOx/TiO2 oxides exhibit 15.1 times greater specific mass activity toward CO oxidation at 140 1C compared with a bare Pt/TiO2 catalyst. We elaborate how the CeOx–TiO2 interfaces activate the interface-mediated Mars–van Krevelen mechanism of CO oxidation and protect Pt single-atoms from CO-poisoning. Through a comprehensive interpretation of the formation and activation of dense Pt single-atoms using operando X-ray absorption spectroscopy, density functional theory calculations, and experimental catalyst performance tests, we provide a key that enables the catalytic performance of noble metal single-atom catalysts to be optimized by atomic-scale tuning of the metal–support interface.
URI
https://pr.ibs.re.kr/handle/8788114/9060
DOI
10.1039/c9ee03492g
ISSN
1754-5692
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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