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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Petrov, R. H. | Madrid |
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Bih, L. |
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Casati, R. |
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Kočí, Jan | Prague |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Lopes, Augusto B.
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article
Pulsed current electrodeposition of Zn-Ag2S/TiO2 nanocomposite films as potential photoelectrodes
Abstract
<p>Nanocomposite Zn-Ag<sub>2</sub>S/TiO<sub>2</sub> and Zn-TiO<sub>2</sub> films were prepared by pulsed current electrolysis from acidic zinc sulphate solutions on a titanium substrate. The influence of the nanoparticles' nature on the structural and morphological characteristics of the metallic electrodeposit was also investigated. The electrodeposits were characterized by X-ray diffraction and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. Using transmission electron microscopy, it was possible to conclude that the chemical treatment applied to the commercial TiO<sub>2</sub> particles promotes the formation of Ag<sub>2</sub>S/TiO<sub>2</sub> composite nanoparticles, with Ti, Ag, S and O in its composition. This was also was confirmed by X-ray fluorescence spectrometry. These particles absorb visible light radiation which makes them promising materials for photoelectrocatalytic processes. Moreover, the modification in nanoparticle composition plays a remarkable influence on the coating morphology and Zn crystallite size. When TiO<sub>2</sub> is added, a change of Zn texture was observed along with a decrease in crystallite size. In contrast, the metal matrix nanocomposites prepared with Ag<sub>2</sub>S/TiO<sub>2</sub> exhibit a spongy Zn morphology with a lower average Zn crystallite size. The nanocomposite films were tested in the photoelectrodegradation of ibuprofen and the best results were obtained for Zn-Ag<sub>2</sub>S/ TiO<sub>2</sub> photoelectrodes.</p>