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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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Wen, Xiaoming
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Publications (7/7 displayed)
- 2024Activated charcoal-mediated non-contact carbothermal reduction of TiO2 for controlled synthesis of Magnéli phase titanium suboxidescitations
- 2017Spatial distribution of lead iodide and local passivation on organo-lead halide perovskitecitations
- 2017Inverted Hysteresis in CH3NH3PbI3 Solar Cellscitations
- 2016Extended hot carrier lifetimes observed in bulk In0.265±0.02Ga0.735N under high-density photoexcitationcitations
- 2015Effect of blend composition on binary organic solar cells using a low band gap polymercitations
- 2009Thermal quenching of photoluminescence in ZnO/ZnMgO multiple quantum wells following oxygen implantation and rapid thermal annealingcitations
- 2007Temperature dependent photoluminescence in oxygen ion implanted and rapid thermally annealed ZnOZnMgO multiple quantum wellscitations
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article
Activated charcoal-mediated non-contact carbothermal reduction of TiO2 for controlled synthesis of Magnéli phase titanium suboxides
Abstract
<p>Conventional Magnéli phase titanium suboxide syntheses often involve highly flammable H<sub>2</sub> gas, extensive precursor pretreatment and yield unwanted TiC or TiO<sub>x</sub>C<sub>y</sub> byproducts. To overcome these limitations, this work introduces a low-cost, safe and scalable carbothermal reduction synthesis method that eliminates the need for H<sub>2</sub> or pretreatment and does not produce carbon-based titanium byproducts. Magnéli phases were generated without physical contact between the bulk organic that acted as the reductant and TiO<sub>2</sub>. Activated charcoal served as the reductant, reducing TiO<sub>2</sub> under an Ar flow, thus limiting O<sub>2</sub>. The phase transition from anatase TiO<sub>2</sub> to Magnéli phases was studied as a function of reduction time. Critical assessment of surface and bulk defects in the series of Magnéli titanium suboxides synthesised revealed a possible redistribution of defects within the lattice with time while maintaining a constant total defect content. Optical property analysis indicated that increasing oxygen deficiency led to increased inter-bandgap absorbance and prolonged lifetime of the photogenerated charge carriers. Oxygen deficiencies exhibited a direct correlation with the water evaporation rate when these Magnéli phase titanium suboxides were applied in solar steam generation. This was attributed to reduced thermal conductivities with increasing oxygen vacancies due to increased phonon scattering by planar defects. The defect-rich Magnéli suboxide sample consisting mainly of Ti<sub>6</sub>O<sub>11</sub> with a remarkably low thermal conductivity of <0.032 W m<sup>−1</sup> K<sup>−1</sup> at 25 °C showed a solar energy conversion efficiency of 56% when applied in an aerogel for solar steam generation. This method provides flexibility for fabricating materials tailored for diverse applications requiring specific defect concentrations or thermoelectric performance.</p>