Abstract
To address the challenges of controlling the morphology and crystalline phase composition of photoactive TiO2 ceramic coatings produced by existing plasma electrolytic oxidation (PEO) technology, a novel laser-assisted PEO method is proposed in this study. The analysis has revealed that the TiO2 coatings prepared by the laser-assisted PEO method had a more intricate 3D multi-porosity architecture. Furthermore, the ratio of TiO2 crystalline phases (anatase to rutile) in the coating can be controlled by adjusting the laser energy during the laser-assisted irradiation process. The fundamental reason for the change in the morphology and composition of the crystalline phases of the coatings is the induction and enhancement of the plasma discharge by laser-assisted irradiation. The photoelectrochemical behavior of the samples was evaluated by employing linear sweep voltammetry under continuous UV irradiation, and the photoresponse current density was measured under intermittent UV irradiation. The laser-assisted PEO coatings prepared with 80 W laser energy under laser-assisted irradiation exhibited the most favorable photoelectrochemical activity. Furthermore, further analysis showed that the enhanced photoelectrochemical activity of the photoactive titanium dioxide coatings was essentially due to a larger specific surface area, lower impedance, higher wettability, and a more suitable crystalline phase ratio.
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