Synthesis, characterization, and mechanistic study involved in the self-doping of TiO2 nanotubes simultaneously to the impedimetric detection of methylene blue
Pablo C. Soto, João V. Martins, Gabrielle Sarto, Maiara M. Slonski, Helder S. Anizelli, Elivelton A. Ferreira, Thiago N. M. Cervantes, Lucio C. Almeida
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Abstract
This paper reports that the self-doped TiO2 nanotubes (SD–TNT) electrode obtained by cathodic polarization promotes a significant decrease in the band gap value and an increase in electrode conductivity, due to the formation of Ti3+ sites and oxygen vacancies. A mechanism for the electrochemical self-doping of TNT electrode and its potential applicability as an impedimetric sensing platform for the target molecule methylene blue (MB) dye was proposed. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) studies made it possible to determine that the charge transfer process in the self-doping process is associated with the stability of H+ species. A 22 full factorial design (FFD) combined with response surface methodology (RSM) was employed to find the optimal operational conditions of the impedimetric sensor, which were equal to −1.4 V at pH 7.0. In this optimized condition, a linear relationship (R2 = 0.999) for the MB concentration range of 0.10 to 1.75 mg L−1 as a function of the charge transfer resistance (Rct) was found. Finally, it was possible to correlate the self-doping process of TNT with the impedimetric behavior, indicating that this system can be used for other cationic compounds of interest.
期刊介绍：
The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry.
The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces.
The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis.
The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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