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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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| Kononenko, Denys |
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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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| Šuljagić, Marija |
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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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| 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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| Rignanese, Gian-Marco |
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Sotiropoulos, S.
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Topics
Publications (3/3 displayed)
- 2021Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reactioncitations
- 2018Broadband luminescence in defect-engineered electrochemically produced porous Si/ZnO nanostructurescitations
- 2015Pt(Ni) electrocatalysts for methanol oxidation prepared by galvanic replacement on TiO2 and TiO2-C powder supportscitations
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article
Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction
Abstract
<p>A simple, alternative, catalyst preparation method was proposed in order to combine the properties of photoactive and stable TiO<sub>2</sub> with state-of-the art of IrO<sub>2</sub> for the oxygen evolution reaction (OER). IrO<sub>2</sub> nanoparticles were obtained in the process of photodeposition on the surface of TiO<sub>2</sub> powder by UV illumination from appropriate Ir salt aqueous solution. Physicochemical characterization of the resulting IrO<sub>2</sub>/TiO<sub>2</sub> composite, containing 25% w/w Ir, was carried out by transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The electrochemical behaviour of the prepared IrO<sub>2</sub>/TiO<sub>2</sub> catalyst was compared with that of commercial unsupported IrO<sub>2</sub>. Cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) were performed to identify the surface electrochemistry and OER of the IrO<sub>2</sub>/TiO<sub>2</sub> catalyst. Electrochemical impedance spectroscopy (EIS) was used to determine uncompensated and charge transfer resistance. CA experiments were carried out in order to evaluate the stability of the IrO<sub>2</sub>/TiO<sub>2</sub> composite during OER in the dark and under UV light irradiation. The photodeposition method on a TiO<sub>2</sub> support resulted in 1–2 nm Ir nanoparticles, very well dispersed on the surface and in their oxidized state (IrO<sub>2</sub>). Electrochemical results indicated that despite its lower conductivity, the IrO<sub>2</sub>/TiO<sub>2</sub> composite exhibits comparable intrinsic electrocatalytic activity for OER with that of the commercial IrO<sub>2</sub> catalyst. It was found that under UV light irradiation there has been improvement of the stability of the IrO<sub>2</sub>/TiO<sub>2</sub> performance during oxygen evolution (presumably due to sustained activation of reactive species via photogenerated holes or OH radicals) as well as current enhancement (due to the interaction between the photogenerated holes in TiO<sub>2</sub> support and IrO<sub>2</sub> nanoparticles). These would be beneficial effects in prolonged water photo-electrolysis.</p>