Formation and characterisation of porous anodized aluminum oxide, synthesized electrochemically in the presence of graphene oxide

Кudelko, Кateryna; Rozhdestvenska, Liudmyla; Оgenko, V. M.

doi:10.1007/s13204-022-02457-y

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…The power supply was a computer-controlled generator TDKlambda ser 3.3 kW-2U (TDKlambda, Tokyo, Japan). Four different current densities (20,40,80, and 100 mA•cm −2 ) were tested to anodize 10 cm 2 of titanium, an area delimited on the titanium surface by means of a Kapton tape, selecting two opposite faces of the specimen. Regarding the bath composition, five different electrolytic aqueous solutions were tested: all of which contained 0.5 M sulfuric acid (Sigma-Aldrich, Darmstadt, Germany) and different amounts of ethylene glycol (EG) (0%, 20%, 40%, 60%, and 80% v/v quantities).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the obtained layer is usually porous [14]; moreover, it can be crystalline, and, as a function of to the environment and the anodizing parameters employed, traces of the electrolytes can be incorporated [11,14,18]. As with aluminum [19,20], titanium anodization can be performed under potential or current control. In this research paper, we adopt the current control approach, whereby we fix the current value, leading the voltage value to vary as a function of the electrical behavior of the system (mainly solution conductivity and insulating properties of the growing oxide).…”

Section: Of 12mentioning

confidence: 99%

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Effect of Bath Composition on Titanium Anodization Using the Constant-Current Approach: A Crystallographic and Morphological Study

et al. 2023

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Porous TiO2 thin films were prepared via electrochemical anodization of commercial-grade titanium foils in baths containing variable amounts of ethylene glycol. X-Ray diffraction, scanning electron microscopy, and UV/visible spectroscopy were employed to assess the effect of ethylene glycol on the nature of TiO2 layers. Emphasis is given to the modification of pore size and anatase-to-rutile ratio since these characteristics strongly affect the catalytic performance of TiO2. To simplify the scaling up of the process, a single-step anodization process was employed on a commercial grade 2 titanium foil in constant-current mode without the use of fluorides—conditions that are easily replicable on an industrial scale. We point out some interesting relationships among operating parameters, such as bath composition and current densities, and the characteristics of the anodization layers evidence that the pore size and anatase-to-rutile ratio can be strictly controlled. Increasing the amount of ethylene glycol stimulated the formation of a thinner and less porous TiO2 layer, richer in rutile phase, and characterized by reduced-diameter pores. These results demonstrate the effectiveness and, to some extent, the tunability of the morphology and mineralogic composition of titanium anodization in fluoride-free and ethylene-glycol-bearing acidic solutions.

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Section: Methodsmentioning

confidence: 99%