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Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO₂ Nanocrystals for Enhanced Gaseous Photocatalytic Performance.

ABSTRACT: We report a simple room-temperature synthesis route for increasing the reactivity of a TiO₂ photocatalyst using a solution plasma process (SPP). Hydrogen radicals generated from the SPP chamber interact with the TiO₂ photocatalyst feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined a pure anatase TiO₂ as a model feedstock because of its photocatalytic attributes and well-characterized properties. After the SPP treatment, the pure anatase crystalline phase was transformed to an anatase/brookite heterocrystalline phase with oxygen vacancies. Furthermore, the SPP treatment promoted the absorption of both UV and visible light by TiO₂. As a result, TiO₂ treated by the SPP for 3 h showed a high gaseous photocatalytic performance (91.1%) for acetaldehyde degradation to CO₂ compared with the activity of untreated TiO₂ (51%). The SPP-treated TiO₂ was also more active than nitrogen-doped TiO₂ driven by visible light (66%). The overall photocatalytic performance was related to the SPP treatment time. The SPP technique could be used to enhance the activity of readily available feedstocks with a short processing time. These results demonstrate the potential of this method for modifying narrow-band gap metal oxides, metal sulfides, and polymer composite-based catalyst materials. The modifications of these materials are not limited to photocatalysts and could be used in a wide range of energy and environment-based applications.

SUBMITTER: Pitchaimuthu S

PROVIDER: S-EPMC6641279 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO2 Nanocrystals for Enhanced Gaseous Photocatalytic Performance.

Pitchaimuthu Sudhagar S Honda Kaede K Suzuki Shoki S Naito Akane A Suzuki Norihiro N Katsumata Ken-Ichi KI Nakata Kazuya K Ishida Naoya N Kitamura Naoto N Idemoto Yasushi Y Kondo Takeshi T Yuasa Makoto M Takai Osamu O Ueno Tomonaga T Saito Nagahiro N Fujishima Akira A Terashima Chiaki C

ACS omega 20180124 1

We report a simple room-temperature synthesis route for increasing the reactivity of a TiO2 photocatalyst using a solution plasma process (SPP). Hydrogen radicals generated from the SPP chamber interact with the TiO2 photocatalyst feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined a pure anatase TiO2 as a model feedstock because of its photocatalytic attributes and well-characterized properties. After t ...[more]

PMID: 31457936

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Project description:A sequence of chemical vapor synthesis and thermal annealing in defined gas atmospheres was used to prepare phase-pure anatase TiO2 nanocrystal powders featuring clean surfaces and a narrow particle size distribution with a median particle diameter of 14.5 ± 0.5 nm. Random networks of these nanocrystals were immobilized from aqueous dispersions onto conducting substrates and are introduced as model systems for electronic conductivity studies. Thermal annealing of the immobilized films at 100 °C < T < 450 °C in air was performed to generate particle-particle contacts upon virtual preservation of the structural properties of the nanoparticle films. The distribution of electrochemically active electronic states as well as the dependence of the electronic conductivity on the Fermi level position in the semiconductor films was studied in aqueous electrolytes in situ using electrochemical methods. An exponential distribution of surface states is observed to remain unchanged upon sintering. However, capacitive peaks corresponding to deep electron traps in the nanoparticle films shift positive on the potential scale evidencing an increase of the trapping energy upon progressive thermal annealing. These peaks are attributed to trap states at particle-particle interfaces in the random nanocrystal network (i.e., at grain boundaries). In the potential region, where the capacitive peaks are detected, we observe an exponential conductivity variation by up to 5 orders of magnitude. The potential range featuring the exponential conductivity variation shifts positive by up to 0.15 V when increasing the sintering temperature from 100 to 450 °C. Importantly, all films approach a potential- and sintering-temperature-independent maximum conductivity of ∼10-4 Ω-1·cm-1 at more negative potentials. On the basis of these results we introduce a qualitative model, which highlights the detrimental impact of electron traps located on particle-particle interfaces on the electronic conductivity in random semiconductor nanoparticle networks.

Dataset Information

Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO₂ Nanocrystals for Enhanced Gaseous Photocatalytic Performance.

Publications

Solution Plasma Process-Derived Defect-Induced Heterophase Anatase/Brookite TiO<sub>2</sub> Nanocrystals for Enhanced Gaseous Photocatalytic Performance.

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