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Double-WalledAg–PtNanotubes Fabricated by Galvanic Replacement and Dealloying: Effect of Composition on the Methanol Oxidation Activity

Schaefer, Sandra and Muench, Falk and Mankel, Eric and Fuchs, Anne and Brötz, Joachim and Kunz, Ulrike and Ensinger, Wolfgang :
Double-WalledAg–PtNanotubes Fabricated by Galvanic Replacement and Dealloying: Effect of Composition on the Methanol Oxidation Activity.
[Online-Edition: http://dx.doi.org/10.1142/S179329201550085X]
In: Nano, 10 (06) p. 1550085. ISSN 1793-2920
[Article] , (2015)

Official URL: http://dx.doi.org/10.1142/S179329201550085X

Abstract

The synthesis of bimetallic nanostructures using galvanic replacement displays a versatile route toward efficient catalysts for fuel cell reactions. We show that electrolessly plated Ag nanotubes (NTs) are a unique template for the synthesis of double-walled Ag-Pt NTs. After replacement reaction, different dealloying protocols are applied to adjust the residual Ag content. The structures were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, providing evidence of a hollow tube structure composed of Ag-Pt alloy. Experiments under harsh conditions reveal, that a significant amount of Ag remain in the NTs, which strongly affects the methanol oxidation performance. With optimized Ag-Pt ratio, the specific activity of Pt/C catalysts can be outperformed. From the obtained results, we emphasize that each effort using galvanic replacement should be accompanied by detailed compositional analysis.

Item Type: Article
Erschienen: 2015
Creators: Schaefer, Sandra and Muench, Falk and Mankel, Eric and Fuchs, Anne and Brötz, Joachim and Kunz, Ulrike and Ensinger, Wolfgang
Title: Double-WalledAg–PtNanotubes Fabricated by Galvanic Replacement and Dealloying: Effect of Composition on the Methanol Oxidation Activity
Language: English
Abstract:

The synthesis of bimetallic nanostructures using galvanic replacement displays a versatile route toward efficient catalysts for fuel cell reactions. We show that electrolessly plated Ag nanotubes (NTs) are a unique template for the synthesis of double-walled Ag-Pt NTs. After replacement reaction, different dealloying protocols are applied to adjust the residual Ag content. The structures were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, providing evidence of a hollow tube structure composed of Ag-Pt alloy. Experiments under harsh conditions reveal, that a significant amount of Ag remain in the NTs, which strongly affects the methanol oxidation performance. With optimized Ag-Pt ratio, the specific activity of Pt/C catalysts can be outperformed. From the obtained results, we emphasize that each effort using galvanic replacement should be accompanied by detailed compositional analysis.

Journal or Publication Title: Nano
Volume: 10
Number: 06
Publisher: World Scientific Publishing, Singapore
Uncontrolled Keywords: Dealloying, electroless plating, galvanic replacement, methanol oxidation reaction, nanotube
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 08 Mar 2016 09:20
Official URL: http://dx.doi.org/10.1142/S179329201550085X
Identification Number: doi:10.1142/S179329201550085X
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