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- W2901478855 abstract "Black TiO2 based nanomaterials have shown considerable potential towards photoelectrochemical water oxidation due to their low cost, raw material availability and operational stability. In this work, thermal annealing of anatase TiO2 nanotube arrays under hydrogen-argon atmosphere at high temperatures (>600 °C) is employed to induce significant oxygen deficiency and phase transitions to substoichiometric structures (Magnéli phases), with the aim to limit interfacial recombination processes and increase the density of charge carriers. Particle-nanowire porous TiO2 sub-stoichiometries are formed at 800 °C, which is quantitatively investigated via X-ray diffraction and Rietveld refinement. The photocurrent of this Ti-O compounds is increased by 2.4-fold at 1.23VRHE and the photoconversion efficiency is enhanced by 2.8-fold at a reduced bias under simulated solar illumination in comparison with pristine TiO2 nanotube arrays. The improved performance is owed to slower interfacial recombination, resulting in the increase of water oxidation selectivity from 65% to 92%, and by the increase in charge carrier density up to two orders of magnitude, as evaluated via electrochemical impedance spectroscopy. Finally, this method is compared to electrochemical hydrogen doping, with the latter exhibiting a significantly lower energy conversion efficiency." @default.
- W2901478855 created "2018-11-29" @default.
- W2901478855 creator A5011046547 @default.
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- W2901478855 date "2019-01-01" @default.
- W2901478855 modified "2023-09-30" @default.
- W2901478855 title "Synthesis of TiO2-based nanocomposites by anodizing and hydrogen annealing for efficient photoelectrochemical water oxidation" @default.
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- W2901478855 doi "https://doi.org/10.1016/j.jpowsour.2018.10.079" @default.
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