Light-induced formation of porous TiO2 with superior electron-storing capacity

Abstract

A light-inducing approach has been demonstrated for the preparation of porous TiO(2) with a large number of stored electrons, which can provide an electron source for subsequent use in redox reactions and provide a spin source to achieve a new room-temperature ferromagnetic semiconductor.

Experimental Validation of the Importance of Thermally Stable Bulk Reduction States in TiO2for Gas Sensor Applications

“…In addition, the porous amorphous titania precursor was obtained through UV-light irradiation of titanium glycolate. [7] SEM, N 2 adsorption and X-ray diffraction measurements (Figure 2) demonstrate that the porous titania precursor was an amorphous material with a BET surface area of 530 m 2 /g and a particle size of ＞1 µm. For comparison, non-porous TiO 2 samples with anatase or rutile structures have been used as precursors to replace the porous amorphous TiO 2 , but no bulk-reduced TiO 2 materials are obtained under identical reaction conditions.…”

“…This type of visible-light absorption is related to the reduction states in TiO 2 (e.g., singleelectron-trapped oxygen vacancies (V o • ) and Ti 3 ＋ species). [3][4][5][6][7][8][9][10][11][12][13]16] The stronger visible-light absorption for TiO 2 -500 indicates the larger amount of reduction states in TiO 2 -500. The optical properties are in agreement with the colors (Figure 5b) of TiO 2 -500 (dark gray), TiO 2 -600 (light gray) and R-TiO 2 (white).…”

“…[7] Typically, titanium glycolate (4.0 g), which was synthesized on a large scale according to the reported procedure, [22] was dispersed in water (300 mL) and then exposed to UV-light irradiation for 1 h. After the irradiation, the color of the solid sample turned from white (titanium glycolate) to intense blue because of the presence of Ti 3＋ . [7] Finally, the blue solid product was separated from the mixture and dried in air, the O 2 molecules of which oxidize the Ti 3＋ to Ti 4＋ because the Ti 3＋ species are on the surface (internal and external) of the solid. The obtained product was the porous amorphous titania precursor described in this paper.…”

“…[3][4][5][6][7][8][9][10][11][12][13] The presence of reduction states has been theoretically and/or experimentally confirmed to play an important role in modifying energy band and surface DOI: 10.6023/A12030002 structures of TiO 2 , [9,13] and in varying its magnetic, [7,8] electronic [11] and photocatalytic behavior. [11][12][13] Gas-sensing is a typical property of metal oxide semiconductor materials such as titania, and this property is associated with conductivity variation, which is induced by the interaction between the adsorbed oxygen on the surface of the semiconductor and the gas molecules to be detected.…”

Preparation of mesoporous TiO2-B nanowires from titanium glycolate and their application as an anode material for lithium-ion batteries

“…Titanium glycolate (TG, Ti(OCH 2 CH 2 O) 2 ) was prepared through the reaction of tetrabutyl titanate and ethylene glycol following a procedure reported previously [24]. Typically, tetrabutyl titanate (5 ml) was added to ethylene glycol (50 ml) and heated at 160°C for 2 h under vigorous stirring.…”