| Autor: |
Ben Naceur, J., Ouertani, R., Chakhari, W., Chtourou, R. |
| Předmět: |
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| Zdroj: |
Journal of Materials Science: Materials in Electronics; Mar2019, Vol. 30 Issue 6, p5631-5639, 9p |
| Abstrakt: |
TiO2 based heterostructures exhibits better photoelectrochemical performances than TiO2 photoanodes solely. However the fact that their synthesis necessitates more than one technique increases their cost. Finding simple and low cost methods to fabricate these heterostructures remain a challenge to many researchers. Trying to overcome this challenge, we propose, in this work, a facile and low cost strategy to sensitize TiO2 nanorod arrays with Sb2S3 nanoparticules, in order to improve the visible light absorbance and the photoelectrochemical performance of the Sb2S3/TiO2 related photoanodes. Such photoanodes were successfully prepared on an F: SnO2 conductive glass by a two-step process of hydrothermal method. Scanning electron microscopy indicated that the Sb2S3 nanoparticles were distributed homogeneously on the surface of TiO2 nanorods. Linear sweep voltammetry results indicated that the highest photocurrent density reached 0.97 mA cm−2 at an applied potential of 0 V vs Ag/AgCl. This performance is attributed to the appropriate relative energy band gap positions between the Sb2S3 and TiO2 in one hand and Sb2S3 and electrochemical potential of water oxidation on the other hand. Flat-band potential and free carrier concentration was determined by Mott-Schottky plots. Electrochemical impedance spectroscopy was employed and an equivalent circuit model is proposed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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