Effect of oxygen vacancy in tungsten oxide on the photocatalytic activity for decomposition of organic materials in the gas phase

2017 ◽  
Vol 79 ◽  
pp. 1-4 ◽  
Author(s):  
Daisuke Fukushi ◽  
Akito Sasaki ◽  
Hideaki Hirabayashi ◽  
Masaaki Kitano
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Tungsten Oxide ◽  
Gas Phase ◽  
Organic Materials ◽  
Effect Of Oxygen

Motivating visible light photocatalytic activity of ultrathin Bi2O2(OH)xCl2−x solid solution with exposed {001} facets by the co-effect of oxygen vacancy and OH replacement

Nanoscale ◽  
2018 ◽  
Vol 10 (32) ◽  
pp. 15294-15302 ◽  
Author(s):  
Xiaoyong Wu ◽  
Kaiqi Li ◽  
Yuan Li ◽  
Gaoke Zhang
Keyword(s):  
Solid Solution ◽  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Visible Light ◽  
Visible Light Photocatalytic Activity ◽  
Effect Of Oxygen ◽  
Visible Light Photocatalytic

The visible light photocatalytic activity of an ultrathin Bi2O2(OH)xCl2−x solid solution with an exposed {001} facet was boosted by adjusting the concentrations of oxygen vacancy and OH in it.

scholarly journals Effect of oxygen vacancy concentration on indium tungsten oxide UV-A photodetector

RSC Advances ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 87-90 ◽  
Author(s):  
Kuan-Yin Chen ◽  
Sheng-Po Chang ◽  
Chih-hung Lin
Keyword(s):  
Oxygen Vacancy ◽  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Tungsten Oxide ◽  
Vacancy Concentration ◽  
Radio Frequency Magnetron ◽  
Oxygen Vacancy Concentration ◽  
Radio Frequency Magnetron Sputtering ◽  
Uv Photodetector ◽  
Effect Of Oxygen

An indium tungsten oxide (IWO) ultraviolet (UV) photodetector was fabricated with radio frequency magnetron sputtering.

Effect of oxygen vacancy on enhanced photocatalytic activity of reduced ZnO nanorod arrays

2015 ◽  
Vol 325 ◽  
pp. 112-116 ◽  
Author(s):  
Chao Wang ◽  
Di Wu ◽  
Peifang Wang ◽  
Yanhui Ao ◽  
Jun Hou ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Effect Of Oxygen

scholarly journals Carrier dynamics and the role of surface defects: Designing a photocatalyst for gas-phase CO2 reduction

2016 ◽  
Vol 113 (50) ◽  
pp. E8011-E8020 ◽  
Author(s):  
Laura B. Hoch ◽  
Paul Szymanski ◽  
Kulbir Kaur Ghuman ◽  
Le He ◽  
Kristine Liao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Excited State ◽  
Oxygen Vacancy ◽  
Band Gap ◽  
Gas Phase ◽  
Density Functional ◽  
Carrier Dynamics ◽  
Valuable Insight ◽  
Relaxation Dynamics ◽  
Excitation Energies

In2O3-x(OH)y nanoparticles have been shown to function as an effective gas-phase photocatalyst for the reduction of CO2 to CO via the reverse water–gas shift reaction. Their photocatalytic activity is strongly correlated to the number of oxygen vacancy and hydroxide defects present in the system. To better understand how such defects interact with photogenerated electrons and holes in these materials, we have studied the relaxation dynamics of In2O3-x(OH)y nanoparticles with varying concentration of defects using two different excitation energies corresponding to above-band-gap (318-nm) and near-band-gap (405-nm) excitations. Our results demonstrate that defects play a significant role in the excited-state, charge relaxation pathways. Higher defect concentrations result in longer excited-state lifetimes, which are attributed to improved charge separation. This correlates well with the observed trends in the photocatalytic activity. These results are further supported by density-functional theory calculations, which confirm the positions of oxygen vacancy and hydroxide defect states within the optical band gap of indium oxide. This enhanced understanding of the role these defects play in determining the optoelectronic properties and charge carrier dynamics can provide valuable insight toward the rational development of more efficient photocatalytic materials for CO2 reduction.

Effect of oxygen vacancy and surface plasmon resonance: a photocatalytic activity study on Ag/Bi4Ti3O12 nanocomposites

2017 ◽  
Vol 28 (23) ◽  
pp. 17896-17907 ◽  
Author(s):  
Shiping Li ◽  
Xiaobing Bian ◽  
Jianzhi Gao ◽  
Gangqiang Zhu ◽  
Mirabbos Hojamberdiev ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Surface Plasmon Resonance ◽  
Oxygen Vacancy ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Effect Of Oxygen

Solution combustion synthesis of nanosized WOx: characterization, mechanism and excellent photocatalytic properties

RSC Advances ◽  
2016 ◽  
Vol 6 (86) ◽  
pp. 83101-83109 ◽  
Author(s):  
Pengqi Chen ◽  
Mingli Qin ◽  
Zheng Chen ◽  
Baorui Jia ◽  
Xuanhui Qu
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Tungsten Oxide ◽  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Photocatalytic Properties ◽  
Radical Ions ◽  
Solution Combustion ◽  
Acid Radical ◽  
Excellent Photocatalytic Activity

We present a method called solution combustion synthesis by using metal acid radical ions to design nanostructured tungsten oxide with both stoichiometric and oxygen-vacancy-rich nonstoichiometric oxides with excellent photocatalytic activity.

Effect of oxygen vacancy on the improved photocatalytic activity of Cr-doped TiO2

2014 ◽  
Vol 28 (25) ◽  
pp. 1450170 ◽  
Author(s):  
Matiullah Khan ◽  
Jing Li ◽  
Wenbin Cao ◽  
Bilal Mansoor ◽  
Fida Rehman
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Oxygen Vacancy ◽  
Band Gap ◽  
Light Absorption ◽  
Visible Light Absorption ◽  
Effect Of Oxygen ◽  
Experimental Findings ◽  
Gap States ◽  
Cr Doping

We employed ab initio calculations to study the effect of various defects on the structural, electronic and optical properties of anatase TiO 2. Single Cr doping at Ti sites introduced isolated Cr  3d states in the band gap of TiO 2. Charge compensated Cr doped model was introduced by simultaneously doping two Cr atoms at Ti sites along with one oxygen vacancy ( Ti 14 O 31 Cr 2). It has been found that Ti 14 O 31 Cr 2 can narrow the band gap significantly and passivate gap states. Removal of the isolated Cr  3d states from the band gap and improved visible light absorption would effectively enhance the photocatalytic activity of Cr doped TiO 2. Our calculations provide reasonable explanation for the previously reported experimental findings.

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