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Open AccessFeature PaperArticle

Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability

Institute of Chemistry, Chemical Technology 1, Carl von Ossietzky University of Oldenburg, D-26129 Oldenburg, Germany
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Coatings 2019, 9(10), 625; https://doi.org/10.3390/coatings9100625
Received: 25 August 2019 / Revised: 24 September 2019 / Accepted: 24 September 2019 / Published: 28 September 2019
(This article belongs to the Special Issue Mesoporous Metal Oxide Films)
This work aims at the identification of porous titanium dioxide thin film (photo)electrodes that represent suitable host structures for a subsequent electrodeposition of plasmonic nanoparticles. Sufficient UV absorption and electrical conductivity were assured by adjusting film thickness and TiO 2 crystallinity. Films with up to 10 layers were prepared by an evaporation-induced self-assembly (EISA) method and layer-by-layer deposition. Activities were tested towards the photoelectrochemical oxidation of water under UV illumination. Enhanced activities with each additional layer were observed and explained with increased amounts of immobilized TiO 2 and access to more active sites as a combined effect of increased surface area, better crystallinity and improved transport properties. Furthermore, films display good electrochemical and mechanical stability, which was related to the controlled intermediate thermal annealing steps, making these materials a promising candidate for future electrochemical depositions of plasmonic noble metal nanoparticles that has been further demonstrated by incorporation of gold. View Full-Text
Keywords: titanium dioxide; mesoporous; thin film; multi-layered; photoanode; semiconductor; photoelectrochemical water oxidation titanium dioxide; mesoporous; thin film; multi-layered; photoanode; semiconductor; photoelectrochemical water oxidation
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MDPI and ACS Style

Gent, E.; Taffa, D.H.; Wark, M. Multi-Layered Mesoporous TiO2 Thin Films: Photoelectrodes with Improved Activity and Stability. Coatings 2019, 9, 625.

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