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Electrocatalytic applications of platinum-decorated TiO2 nanotubes prepared by a fully wet-chemical synthesis

Antoni, Markus and Muench, Falk and Kunz, Ulrike and Brötz, Joachim and Donner, Wolfgang and Ensinger, Wolfgang (2017):
Electrocatalytic applications of platinum-decorated TiO2 nanotubes prepared by a fully wet-chemical synthesis.
In: Journal of Materials Science, Springer, pp. 7754-7767, 52, (13), ISSN 0022-2461,
DOI: 10.1007/s10853-017-1035-4,
[Online-Edition: https://doi.org/10.1007/s10853-017-1035-4],
[Article]

Abstract

Pt-decorated TiO 2 TiO2 nanotubes Pt@TiO2 are prepared only by applying a set of facile wet-chemical redox reactions to ion track-etched polycarbonate templates. First, a homogeneous layer of Pt nanoparticles is deposited onto the complex template surface by reducing potassium tetrachloroplatinate with absorbed dimethylaminoborane. Second, the template is coated with a conformal TiO 2 TiO2 layer, using a chemical bath deposition reaction based on titanium(III) chloride. After the removal of the template, the rutile-type TiO 2TiO2 nanotubes remain decorated with Pt nanoparticles and nanoparticle-clusters on their outside. During the process, neither vacuum techniques nor external current sources or addition of heat are employed. The crystallinity, composition, and morphology of the composite nanotubes are analysed by X-ray diffraction, scanning and transmission electron microscopy as well as by energy-dispersive X-ray spectroscopy. Finally, the obtained materials are examplarily applied in the electrooxidation of ethanol and formic acid, and their performances have been evaluated. Compared to conventional carbon black-supported Pt nanoparticles, the Pt@TiO2 nanotubes show higher reaction rates. Mass activities of 2.36 A mg −1 Pt cm −2 A mgPt−1 cm−2 are reached in ethanol oxidation and 7.56 A mg −1 Pt cm −2 A mgPt−1 cm−2 in the formic acid oxidation. The present structures are able to exploit the synergy of Pt and TiO 2 TiO2 with a bifunctional mechanism to result in powerful but easy-to-fabricate catalyst structures. They represent an easily producible type of composite nanostructures which can be applied in various fields such as in catalytics and sensor technology.

Item Type: Article
Erschienen: 2017
Creators: Antoni, Markus and Muench, Falk and Kunz, Ulrike and Brötz, Joachim and Donner, Wolfgang and Ensinger, Wolfgang
Title: Electrocatalytic applications of platinum-decorated TiO2 nanotubes prepared by a fully wet-chemical synthesis
Language: English
Abstract:

Pt-decorated TiO 2 TiO2 nanotubes Pt@TiO2 are prepared only by applying a set of facile wet-chemical redox reactions to ion track-etched polycarbonate templates. First, a homogeneous layer of Pt nanoparticles is deposited onto the complex template surface by reducing potassium tetrachloroplatinate with absorbed dimethylaminoborane. Second, the template is coated with a conformal TiO 2 TiO2 layer, using a chemical bath deposition reaction based on titanium(III) chloride. After the removal of the template, the rutile-type TiO 2TiO2 nanotubes remain decorated with Pt nanoparticles and nanoparticle-clusters on their outside. During the process, neither vacuum techniques nor external current sources or addition of heat are employed. The crystallinity, composition, and morphology of the composite nanotubes are analysed by X-ray diffraction, scanning and transmission electron microscopy as well as by energy-dispersive X-ray spectroscopy. Finally, the obtained materials are examplarily applied in the electrooxidation of ethanol and formic acid, and their performances have been evaluated. Compared to conventional carbon black-supported Pt nanoparticles, the Pt@TiO2 nanotubes show higher reaction rates. Mass activities of 2.36 A mg −1 Pt cm −2 A mgPt−1 cm−2 are reached in ethanol oxidation and 7.56 A mg −1 Pt cm −2 A mgPt−1 cm−2 in the formic acid oxidation. The present structures are able to exploit the synergy of Pt and TiO 2 TiO2 with a bifunctional mechanism to result in powerful but easy-to-fabricate catalyst structures. They represent an easily producible type of composite nanostructures which can be applied in various fields such as in catalytics and sensor technology.

Journal or Publication Title: Journal of Materials Science
Volume: 52
Number: 13
Publisher: Springer
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: 21 Jul 2017 09:13
DOI: 10.1007/s10853-017-1035-4
Official URL: https://doi.org/10.1007/s10853-017-1035-4
Identification Number: doi:10.1007/s10853-017-1035-4
Funders: We wish to thank the German Federal Ministry of Education and Research and the VDI/VDE IT for financial support (Project 1D-SENSE, FKZ 16ES0289K).
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