Cubic anatase TiO2 nanocrystals with enhanced photocatalytic CO2 reduction activity

2015 ◽  
Vol 51 (37) ◽  
pp. 7950-7953 ◽  
Author(s):  
Quanlong Xu ◽  
Jiaguo Yu ◽  
Jun Zhang ◽  
Jinfeng Zhang ◽  
Gang Liu
Keyword(s):  
Photocatalytic Activity ◽  
Co2 Reduction ◽  
High Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Tio2 Nanocrystals ◽  
Reduction Activity

Anatase TiO2 nanocubes with exposed {100} and {001} facets show especially high photocatalytic activity toward CO2 reduction to methane and methanol.

scholarly journals DFT Study on Regulating the Electronic Structure and CO2 Reduction Reaction in BiOBr/Sulphur-Doped G-C3N4 S-Scheme Heterojunctions

2021 ◽  
Vol 3 ◽  
Author(s):  
Xingang Fei ◽  
Liuyang Zhang ◽  
Jiaguo Yu ◽  
Bicheng Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Density Functional ◽  
Co2 Reduction ◽  
Photogenerated Electron ◽  
Reduction Reaction ◽  
High Photocatalytic Activity ◽  
Reduction Activity ◽  
Element Doping ◽  
Co2 Reduction Reaction

Photocatalytic CO2 reduction is a promising method to mitigate the greenhouse effect and energy shortage problem. Development of effective photocatalysts is vital in achieving high photocatalytic activity. Herein, the S-scheme heterojunctions composed by BiOBr and g-C3N4 with or without S doping are thoroughly investigated for CO2 reduction by density functional theory (DFT) calculation. Work function and charge density difference demonstrate the existence of a built-in electric field in the system, which contributes to the separation of photogenerated electron-hole pairs. Enhanced strength of a built-in electric field is revealed by analysis of Bader charge and electric field intensity. The results indicate that S doping can tailor the electronic structures and thus improve the photocatalytic activity. According to the change in absorption coefficient, system doping can also endow the heterojunction with increased visible light absorption. The in-depth investigation indicates that the superior CO2 reduction activity is ascribed to low rate-determining energy. And both of the heterojunctions are inclined to generate CH3OH rather than CH4. Furthermore, S doping can further reduce the energy from 1.23 to 0.44 eV, indicating S doping is predicted to be an efficient photocatalyst for reducing CO2 into CH3OH. Therefore, this paper provides a theoretical basis for designing appropriate catalysts through element doping and heterojunction construction.

scholarly journals Microwave-Assisted Solvothermal Synthesis of Chalcogenide Composite Photocatalyst and Its Photocatalytic CO2 Reduction Activity under Simulated Solar Light

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 789
Author(s):  
Gang-Juan Lee ◽  
Yu-Hong Hou ◽  
Hsin-Ting Huang ◽  
Wenmin Wang ◽  
Cong Lyu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Photocatalytic Activity ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Photoluminescence Intensity ◽  
Composite Photocatalyst ◽  
Microwave Assisted ◽  
Reduction Activity ◽  
Operation Conditions ◽  
Co Doped

A novel heterostructure consisting of Ru and Cu co-doped ZnS nanopowders (RCZS) into a MoS2-graphene hybrid (MSG) is successfully prepared by the microwave-assisted solvothermal approach. RCZS nanopowders are fabricated on the surface of MSG, which produces a nanoscale interfacial between RCZS and MSG. As the photo-excited electrons of RCZS can easily migrate to MoS2 through graphene by hindering the electron and hole (e– and h+) recombination, the photocatalytic activity could be improved by effective charge transfer. As RCZS are anchored onto the MSG, the photoluminescence intensity of the chalcogenide composite photocatalyst obviously decreases. In addition, a quaternary ruthenium and copper-based chalcogenide RCZS/MSG is able to improve the harvest and utilization of light. With the increase in the concentrations of Ru until 4 mol%, the band gap significantly decreases from 3.52 to 2.73 eV. At the same time, moderate modification by ruthenium can decrease the PL intensity compared to the pristine CZS/MSG sample, which indicates the enhancement of e– and h+ separation by Ru addition. The photocatalytic activity of as-synthesized chalcogenide composite photocatalysts is evaluated by the photocatalytic carbon dioxide reduction. Optimized operation conditions for carbon dioxide reduction have been performed, including the concentration of NaOH solution, the amount of RCZS/MSG photocatalyst, and the content of co-doped ruthenium. The doping of ruthenium would efficiently improve the performance of the photocatalytic activity for carbon dioxide reduction. The optimal conditions, such as the concentration of 2 M NaOH and the 0.5RCZS/MSG dosage of 0.05 g L–1, provide the maximum methane gas yield of 58.6 μmol h−1 g–1.

Unraveling the quantum dynamics origin of high photocatalytic activity in nitrogen-doped anatase TiO2: time-domain ab initio analysis

2020 ◽  
Vol 8 (47) ◽  
pp. 25235-25244
Author(s):  
Yating Yang ◽  
Zhaosheng Zhang ◽  
Wei-Hai Fang ◽  
Sebastian Fernandez-Alberti ◽  
Run Long
Keyword(s):  
Photocatalytic Activity ◽  
Ab Initio ◽  
Time Domain ◽  
Quantum Dynamics ◽  
High Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Nitrogen Doped ◽  
Hole Recombination

TiO2 doping with nitrogen greatly suppresses nonradiative electron-hole recombination and enhances photocatalytic activity.

Synthesis, characterization and enhanced photocatalytic CO2 reduction activity of graphene supported TiO2 nanocrystals with coexposed {001} and {101} facets

2016 ◽  
Vol 18 (19) ◽  
pp. 13186-13195 ◽  
Author(s):  
Zhuo Xiong ◽  
Ying Luo ◽  
Yongchun Zhao ◽  
Junying Zhang ◽  
Chuguang Zheng ◽  
...  
Keyword(s):  
Co2 Reduction ◽  
Tio2 Nanocrystals ◽  
Reduction Activity ◽  
Supported Tio2

Enhanced CO2 photoreduction over graphene supported TiO2 nanocrystals with co-exposed {001} and {101} facets.

Hydrothermal synthesis of the novel rutile-mixed anatase TiO2 nanosheets with dominant {001} facets for high photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 84035-84041 ◽  
Author(s):  
Gongsheng Song ◽  
Chengzhi Luo ◽  
Qiang Fu ◽  
Chunxu Pan
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
High Photocatalytic Activity ◽  
Anatase Tio2 ◽  
The Novel ◽  
Hydrothermal Route ◽  
Tio2 Nanosheets

We introduce a hydrothermal route to synthesize rutile-mixed anatase nanosheets with dominant {001} facets for high photocatalytic activity.

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