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Suspension plasma sprayed coatings using dilute hydrothermally produced titania feedstocks for photocatalytic applications

Robinson, BW; Tighe, CJ; Gruar, RI; Mills, A; Parkin, IP; Tabecki, AK; Lovelock, HLDV; (2015) Suspension plasma sprayed coatings using dilute hydrothermally produced titania feedstocks for photocatalytic applications. Journal of Materials Chemistry A , 3 (24) pp. 12680-12689. 10.1039/c4ta05397d. Green open access

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Abstract

Titanium dioxide coatings have potential applications including photocatalysts for solar assisted hydrogen production, solar water disinfection and self-cleaning windows. Herein, we report the use of suspension plasma spraying (SPS) for the deposition of conformal titanium dioxide coatings. The process utilises a nanoparticle slurry of TiO2 (ca. 6 and 12 nm respectively) in water, which is fed into a high temperature plasma jet (ca. 7000–20 000 K). This facilitated the deposition of adherent coatings of nanostructured titanium dioxide with predominantly anatase crystal structure. In this study, suspensions of nano-titanium dioxide, made via continuous hydrothermal flow synthesis (CHFS), were used directly as a feedstock for the SPS process. Coatings were produced by varying the feedstock crystallite size, spray distance and plasma conditions. The coatings produced exhibited ca. 90–100% anatase phase content with the remainder being rutile (demonstrated by XRD). Phase distribution was homogenous throughout the coatings as determined by micro-Raman spectroscopy. The coatings had a granular surface, with a high specific surface area and consisted of densely packed agglomerates interspersed with some melted material. All of the coatings were shown to be photoactive by means of a sacrificial hydrogen evolution test under UV radiation and compared favourably with reported values for CVD coatings and compressed discs of P25.

Type: Article
Title: Suspension plasma sprayed coatings using dilute hydrothermally produced titania feedstocks for photocatalytic applications
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c4ta05397d
Publisher version: http://dx.doi.org/10.1039/c4ta05397d
Language: English
Additional information: This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1469568
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