کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6471679 | 1424122 | 2017 | 7 صفحه PDF | دانلود رایگان |
- We developed another approach for polarised-TiO2NTs as an electrochemical sensor.
- P-TiO2NT electrode was applied in the electroanalytical sensing of model compounds.
- Figures of merit for P-TiO2NT electrode were compared to glassy carbon electrodes.
The use of TiO2 nanotube (TiO2NTs) electrodes as anodes without UV irradiation has been described herein for electroanalytical purposes. Although semiconductors of n-type, such as TiO2NTs, do not offer any potential electrochemical response at the anodic region, they can be “activated” once they are a priori subjected to a simple cathodic polarization (P-TiO2NTs) and used to follow the oxidation reaction without any other modification. The best polarization conditions were obtained at 0.1 mol Lâ1 KH2PO4 pH 10 at â2.5 V for 5 min, and the polarized TiO2 electrode was applied in the Fe(CN)64â redox probe oxidation and also p-phenylenediamine (PPD) determination as models of species which undergo oxidation. Following the optimization of the parameters, analytical curves for Fe(CN)64â and PPD were constructed in the range of 2.5 Ã 10â5 to 5 Ã 10â3 mol Lâ1 with a detection limit at 7.23 Ã 10â6 mol Lâ1 and 0.500 to 98.6 Ã 10â6 mol Lâ1 with a detection limit at 0.558 Ã 10â7 mol Lâ1 using linear sweep voltammetry and linear sweep adsorptive stripping voltammetry techniques, respectively. Lastly, the figures of merit for P-TiO2NT and conventional glassy carbon electrodes are compared. Our results show that P-TiO2NT electrodes can be used as an excellent platform for the development of electrochemical sensors.
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Journal: Electrochimica Acta - Volume 235, 1 May 2017, Pages 527-533