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3D Flower-like TiO[sub.2] Nanostructures: Anatase-To-Rutile Phase Transformation and Photoelectrochemical Application
Catalysts, 2023-03, Vol.13 (4)
[Peer Reviewed Journal]
COPYRIGHT 2023 MDPI AG ;ISSN: 2073-4344 ;EISSN: 2073-4344 ;DOI: 10.3390/catal13040671
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Title:
3D Flower-like TiO[sub.2] Nanostructures: Anatase-To-Rutile Phase Transformation and Photoelectrochemical Application
Author:
Kusior, Anna
;
Jeleń, Piotr
;
Sitarz, Maciej
;
Świerczek, Konrad
;
Radecka, Marta
Subjects:
Semiconductors
Is Part Of:
Catalysts, 2023-03, Vol.13 (4)
Description:
Flower-like TiO[sub.2] nanostructures were obtained by chemical oxidation of Ti foil using H[sub.2]O[sub.2] combined with subsequent annealing. This paper offers an analysis of the phase transformation of 3D flower-like titanium dioxide nanostructures. The role of the annealing atmosphere, sample thickness, grain shape, and nanoflower size are discussed. The nanostructures were examined using SEM, XRD, and Raman spectroscopy. Due to the nature of these two processes, the morphology of these nanomaterials is complex, and is obtained through a reaction involving Ti foil and H[sub.2]O[sub.2] at 80°C. A distinction is made between the layer composed of small grains at the substrate/oxide interface, elongated crystal-like structures, and outer spongle-like film. The annealing parameters, such as atmosphere (air or argon) and temperature (450 or 600 °C), affect phase composition. The photoelectrochemical performance of the anode based on flower-like TiO[sub.2] has been shown. The thickness and phase composition of the anodes are factors that strongly affect the photocurrent. The multiphase heterojunctions proposed for 3D flower-like TiO[sub.2] photoanodes in photoelectrochemical (PEC) cells suppose that the conduction band of anatase should be above rutile. The highest photoelectrochemical performance was obtained for a photoanode composed of 20-40% anatase and an associated thickness of 0.75-1.5 µm.
Publisher:
MDPI AG
Language:
English
Identifier:
ISSN: 2073-4344
EISSN: 2073-4344
DOI: 10.3390/catal13040671
Source:
ROAD: Directory of Open Access Scholarly Resources
ProQuest Central
DOAJ Directory of Open Access Journals
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