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Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol

Scheuerlein, Martin Christoph and Muench, Falk and Kunz, Ulrike and Hellmann, Tim and Hofmann, Jan P. and Ensinger, Wolfgang (2020):
Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol.
In: ChemElectroChem, 7 (16), pp. 3496-3507. Wiley-VCH, ISSN 2196-0216,
DOI: 10.1002/celc.202000811,
[Article]

Abstract

Electroless plating is a powerful tool in nanofabrication and is available for many of the noble transition metals. There is, however, a striking lack of electroless plating procedures for the rarer platinum-group metals. In this work, two plating baths for nanoscale iridium coatings are developed and their conformality and nanofabrication potential are showcased by coating ion-track-etched polycarbonate membranes, creating Ir nanotubes in the process. Both plating solutions yield morphologically different deposits, indicating that the microstructure of the film can be tuned by adjusting the composition of the plating bath. The catalytic performance of the deposited materials is investigated by using membrane-embedded nanotubes as catalysts for the reduction of 4-nitrophenol and methyl orange by borohydride, showing remarkable activity and stability. Operation in flow-through configuration, in which the metallized membrane is implemented as a microreactor greatly enhances the interaction with the catalyst surface, considerably increasing product yield. The results highlight the potential of Ir nanoplating for realizing sophisticated nanostructures and heterogeneous catalysts, but also illustrate the intricacies related to the complex chemistry of electroless Ir plating baths.

Item Type: Article
Erschienen: 2020
Creators: Scheuerlein, Martin Christoph and Muench, Falk and Kunz, Ulrike and Hellmann, Tim and Hofmann, Jan P. and Ensinger, Wolfgang
Title: Electroless Nanoplating of Iridium: Template‐Assisted Nanotube Deposition for the Continuous Flow Reduction of 4‐Nitrophenol
Language: English
Abstract:

Electroless plating is a powerful tool in nanofabrication and is available for many of the noble transition metals. There is, however, a striking lack of electroless plating procedures for the rarer platinum-group metals. In this work, two plating baths for nanoscale iridium coatings are developed and their conformality and nanofabrication potential are showcased by coating ion-track-etched polycarbonate membranes, creating Ir nanotubes in the process. Both plating solutions yield morphologically different deposits, indicating that the microstructure of the film can be tuned by adjusting the composition of the plating bath. The catalytic performance of the deposited materials is investigated by using membrane-embedded nanotubes as catalysts for the reduction of 4-nitrophenol and methyl orange by borohydride, showing remarkable activity and stability. Operation in flow-through configuration, in which the metallized membrane is implemented as a microreactor greatly enhances the interaction with the catalyst surface, considerably increasing product yield. The results highlight the potential of Ir nanoplating for realizing sophisticated nanostructures and heterogeneous catalysts, but also illustrate the intricacies related to the complex chemistry of electroless Ir plating baths.

Journal or Publication Title: ChemElectroChem
Journal volume: 7
Number: 16
Publisher: Wiley-VCH
Uncontrolled Keywords: iridium, electroless plating, nanotubes, microreactors, 4-nitrophenol
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 > Surface Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 28 Aug 2020 06:22
DOI: 10.1002/celc.202000811
Official URL: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10...
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