| Autor: |
Gong, Hanyu, Wang, Lu, Zhou, Kechao, Zhang, Dou, Zhang, Yan, Adamaki, Vana, Bowen, Chris, Sergejevs, Aleksandrs |
| Zdroj: |
Advanced Powder Materials; 20210101, Issue: Preprints |
| Abstrakt: |
Modified titanium dioxide as a catalyst to improve photocatalytic performance has attracted extensive attention. Magnéli, a fascinating sub-stoichiometric titanium oxide phase that contains oxygen vacancies of TiO2, is proposed as potential photo-electrode for photocatalysis due to its high conductivity and photoelectric conversion efficiency. In this work, partially reduced porous TiO2ceramics with a graded reduction profile and an aligned pore structure were prepared by carbo-thermal reduction of freeze-cast TiO2with a range of porosities from 10 to 30 vol.%. AC conductivity evaluation revealed that the oxygen vacancies that exist in Magnéli lead to a relatively high AC conductivity of ∼10 S/m at 1 kHz, as compared to that of stoichiometric porous TiO2. A maximum photocurrent density and incident photon-to-current efficiency (IPCE %) of 9.14 mA/cm2and 40.52% respectively were achieved from the gradient porous Magnéli with a porosity of 30 vol.%. The utilisation of partially reduced porous TiO2with a graded reduction profile as a photo-electrode material offers a new strategy for photocatalysis applications. |
| Databáze: |
Supplemental Index |
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