Electrosynthesis of Ordered TiO2 Nanotubular Layers in Deep Eutectic Solvents and Their Properties. Issue 10 (1st January 2019)

• Record Type: Journal Article
• Authors: Starykevich, M.; Maltanava, H.; Tedim, J.; Poznyak, S. K.; Ferreira, M. G. S.
• Is Part Of: Journal of the Electrochemical Society. Volume 166:Issue 10(2019)
• Page Start: H377
• Page End: H386
• Publication Date: 2019-01-01
• Subjects: Anodic Films -- Nanotubes -- Surface Science -- Deep eutectic solvents -- Ordered nanotubular layers -- Titanium dioxide; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0131910jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The successful preparation of the titania nanotubular layers (TNT) in different deep eutectic solvent based electrolytes was performed in the current work. Choline chloride based deep eutectic solvents with various hydrogen bond donors, such as ethylene glycol, urea and malonic acid were used. All results were compared with standard ethylene glycol based electrolyte. The influence of the solution temperature, fluoride ion concentration, applied voltage and anodization time on morphology of the titania nanotubular layers was explored. It was demonstrated for the first time that the use of very viscous electrolytes request use of higher temperature. General trends for deep eutectic solvent based electrolytes and optimum anodization parameters for each system were developed. It was found that the morphology of the films prepared in choline chloride with urea and malonic acid systems is closer to TNT prepared in water solution than in TNT obtained from organic based electrolytes. Influence of the viscous electrolytes on pores formation rate was demonstrated. The texture of the annealed films was investigated by XRD and shows strong differences in properties depending on hydrogen bond donors. Moreover, physicochemical properties were measured, including photocurrent and apparent donor concentration.