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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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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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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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| Ospanova, Alyiya |
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| Ali, M. A. |
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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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| Rignanese, Gian-Marco |
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Mishra, A.
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Topics
Publications (10/10 displayed)
- 2024Linear Friction Welding of Similar and Dissimilar Materials: A Reviewcitations
- 2023Passive acoustic mapping for monitoring burst wave lithotripsy
- 2022p-CuO films and photoelectrochemical corrosioncitations
- 2021Surface Modification of Bioresorbable Phosphate Glasses for Controlled Protein Adsorptioncitations
- 2019Core-clad phosphate glass fibers for biosensingcitations
- 2017Organic and hybrid solar cells based onwell-defined organic semiconductors and morphologiescitations
- 2017Thermal, structural and in vitro dissolution of antimicrobial copper-doped and slow resorbable iron-doped phosphate glassescitations
- 2015Mathematical Modeling of Magneto Pulsatile Blood Flow Through a Porous Medium with a Heat Sourcecitations
- 2014Fabrication of metal@SnO2 core-shell nanocomposites for gas sensing applications
- 2009Shape-persistent oligothienylene-ethynylene-based dendrimers: synthesis, spectroscopy and electrochemical characterizationcitations
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article
p-CuO films and photoelectrochemical corrosion
Abstract
CuO films on transparent, conductive substrates (fluorine doped tin oxide, FTO), obtained by spray pyrolysis, were analyzed photoelectrochemically in neutral and alkaline solutions. The photoresponse was typical for a p-type semiconductor in a junction with an electrolyte. In absence of an electron scavenger in solution, cathodic photocurrents decayed rapidly (within minutes). This is ascribed to photogenerated conduction band electron initiated reduction of the electrode material to Cu2O. Such films could be reactivated by annealing in air, which resulted in the reconstruction of the CuO phase and complete recovery of photocurrents. Reducible species (methylviologen, ferricyanide, oxygen) were added to the electrolyte in order to compete with the photoelectrochemical auto-reduction of the semiconducting layer. In the case of O2 as scavenger, formation of a product in solution, H2O2, was observed, although with a Faradaic efficiency of only 2 percent. In all cases, only minor long-term stabilization was achieved. This was because sufficiently high concentrations of electron scavengers could not be used when high cathodic dark currents were developed (case of ferricyanide), or when the solubility was limited (case of oxygen). In addition, reduction of the semiconductor by the reduced photoactive species (case of methylviologen) can occur. © 2022 Elsevier B.V.