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Title: Modifying the Reactivity of Single Pd Sites in a Trimetallic Sn‐Pd‐Ag Surface Alloy: Tuning CO Binding Strength

Journal Article · · Small
ORCiD logo [1];  [2]; ORCiD logo [2];  [3]
  1. Department of Chemistry and Chemical Biology Harvard University Cambridge MA 02138 USA
  2. Department of Chemical and Biomolecular Engineering Tulane University New Orleans LA 70118 USA
  3. John A. Paulson School of Engineering and Applied Sciences Harvard University Cambridge MA 02138 USA

Abstract Improving control over active‐site reactivity is a grand challenge in catalysis. Single‐atom alloys (SAAs) consisting of a reactive component doped as single atoms into a more inert host metal feature localized and well‐defined active sites, but fine tuning their properties is challenging. Here, a framework is developed for tuning single‐atom site reactivity by alloying in an additional inert metal, which this work terms an alloy‐host SAA. Specifically, this work creates about 5% Pd single‐atom sites in a Pd 33 Ag 67 (111) single crystal surface, and then identifies Sn based on computational screening as a suitable third metal to introduce. Subsequent experimental studies show that introducing Sn indeed modifies the electronic structure and chemical reactivity (measured by CO desorption energies) of the Pd sites. The modifications to both the electronic structure and the CO adsorption energies are in close agreement with the calculations. These results indicate that the use of an alloy host environment to modify the reactivity of single‐atom sites can allow fine‐tuning of catalytic performance and boost resistance against strong‐binding adsorbates such as CO.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0012573
OSTI ID:
2440069
Journal Information:
Small, Journal Name: Small Journal Issue: 48 Vol. 20; ISSN 1613-6810
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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