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High density catalytic hot spots in ultrafine wavy nanowires

Structural defects/grain boundaries in metallic materials can exhibit unusual chemical reactivity and play important roles in catalysis. Bulk polycrystalline materials possess many structural defects, which is, however, usually inaccessible to solution reactants and hardly useful for practical catal... Full description

Journal Title: Nano letters 09 July 2014, Vol.14(7), pp.3887-94
Main Author: Huang, Xiaoqing
Other Authors: Zhao, Zipeng , Chen, Yu , Chiu, Chin-Yi , Ruan, Lingyan , Liu, Yuan , Li, Mufan , Duan, Xiangfeng , Huang, Yu
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1530-6992 ; PMID: 24873775 Version:1 ; DOI: 10.1021/nl501137a
Link: http://pubmed.gov/24873775
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recordid: medline24873775
title: High density catalytic hot spots in ultrafine wavy nanowires
format: Article
creator:
  • Huang, Xiaoqing
  • Zhao, Zipeng
  • Chen, Yu
  • Chiu, Chin-Yi
  • Ruan, Lingyan
  • Liu, Yuan
  • Li, Mufan
  • Duan, Xiangfeng
  • Huang, Yu
subjects:
  • Grain Boundaries
  • Rhodium
  • Catalytic Activity
  • Nanowires
  • High Density
  • Catalysts
  • Crystal Defects
  • Catalysis
  • Miscellaneous Sciences (So)
  • Analysis (MD)
  • Chemical Analysis (Ep)
  • Chemical Analysis (Ed)
  • Chemical Analysis (EC)
ispartof: Nano letters, 09 July 2014, Vol.14(7), pp.3887-94
description: Structural defects/grain boundaries in metallic materials can exhibit unusual chemical reactivity and play important roles in catalysis. Bulk polycrystalline materials possess many structural defects, which is, however, usually inaccessible to solution reactants and hardly useful for practical catalytic reactions. Typical metallic nanocrystals usually exhibit well-defined crystalline structure with few defects/grain boundaries. Here, we report the design of ultrafine wavy nanowires (WNWs) with a high density of accessible structural defects/grain boundaries as highly active catalytic hot spots. We show that rhodium WNWs can be readily synthesized with controllable number of structural defects and demonstrate the number of structural defects can fundamentally determine their catalytic activity in selective oxidation of benzyl alcohol by O2, with the catalytic activity increasing with the number of structural defects. X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms (CVs) studies demonstrate that the structural defects can significantly alter the chemical state of the Rh WNWs to modulate their catalytic activity. Lastly, our systematic studies further demonstrate that the concept of defect engineering in WNWs for improved catalytic performance is general and can be readily extended to other similar systems, including palladium and iridium WNWs.
language: eng
source:
identifier: E-ISSN: 1530-6992 ; PMID: 24873775 Version:1 ; DOI: 10.1021/nl501137a
fulltext: no_fulltext
issn:
  • 15306992
  • 1530-6992
url: Link


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titleHigh density catalytic hot spots in ultrafine wavy nanowires
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ispartofNano letters, 09 July 2014, Vol.14(7), pp.3887-94
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descriptionStructural defects/grain boundaries in metallic materials can exhibit unusual chemical reactivity and play important roles in catalysis. Bulk polycrystalline materials possess many structural defects, which is, however, usually inaccessible to solution reactants and hardly useful for practical catalytic reactions. Typical metallic nanocrystals usually exhibit well-defined crystalline structure with few defects/grain boundaries. Here, we report the design of ultrafine wavy nanowires (WNWs) with a high density of accessible structural defects/grain boundaries as highly active catalytic hot spots. We show that rhodium WNWs can be readily synthesized with controllable number of structural defects and demonstrate the number of structural defects can fundamentally determine their catalytic activity in selective oxidation of benzyl alcohol by O2, with the catalytic activity increasing with the number of structural defects. X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms (CVs) studies demonstrate that the structural defects can significantly alter the chemical state of the Rh WNWs to modulate their catalytic activity. Lastly, our systematic studies further demonstrate that the concept of defect engineering in WNWs for improved catalytic performance is general and can be readily extended to other similar systems, including palladium and iridium WNWs.
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subjectGrain Boundaries ; Rhodium ; Catalytic Activity ; Nanowires ; High Density ; Catalysts ; Crystal Defects ; Catalysis ; Miscellaneous Sciences (So) ; Analysis (MD) ; Chemical Analysis (Ep) ; Chemical Analysis (Ed) ; Chemical Analysis (EC);
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titleHigh density catalytic hot spots in ultrafine wavy nanowires
descriptionStructural defects/grain boundaries in metallic materials can exhibit unusual chemical reactivity and play important roles in catalysis. Bulk polycrystalline materials possess many structural defects, which is, however, usually inaccessible to solution reactants and hardly useful for practical catalytic reactions. Typical metallic nanocrystals usually exhibit well-defined crystalline structure with few defects/grain boundaries. Here, we report the design of ultrafine wavy nanowires (WNWs) with a high density of accessible structural defects/grain boundaries as highly active catalytic hot spots. We show that rhodium WNWs can be readily synthesized with controllable number of structural defects and demonstrate the number of structural defects can fundamentally determine their catalytic activity in selective oxidation of benzyl alcohol by O2, with the catalytic activity increasing with the number of structural defects. X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms (CVs) studies demonstrate that the structural defects can significantly alter the chemical state of the Rh WNWs to modulate their catalytic activity. Lastly, our systematic studies further demonstrate that the concept of defect engineering in WNWs for improved catalytic performance is general and can be readily extended to other similar systems, including palladium and iridium WNWs.
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abstractStructural defects/grain boundaries in metallic materials can exhibit unusual chemical reactivity and play important roles in catalysis. Bulk polycrystalline materials possess many structural defects, which is, however, usually inaccessible to solution reactants and hardly useful for practical catalytic reactions. Typical metallic nanocrystals usually exhibit well-defined crystalline structure with few defects/grain boundaries. Here, we report the design of ultrafine wavy nanowires (WNWs) with a high density of accessible structural defects/grain boundaries as highly active catalytic hot spots. We show that rhodium WNWs can be readily synthesized with controllable number of structural defects and demonstrate the number of structural defects can fundamentally determine their catalytic activity in selective oxidation of benzyl alcohol by O2, with the catalytic activity increasing with the number of structural defects. X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms (CVs) studies demonstrate that the structural defects can significantly alter the chemical state of the Rh WNWs to modulate their catalytic activity. Lastly, our systematic studies further demonstrate that the concept of defect engineering in WNWs for improved catalytic performance is general and can be readily extended to other similar systems, including palladium and iridium WNWs.
doi10.1021/nl501137a
pmid24873775
issn15306984
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date2014-07-09