Effective band gap engineering by the incorporation of Ce, N and S dopant ions into the SrTiO3 lattice: exploration of photocatalytic activity under UV/solar light

2019 ◽  
Vol 94 (1) ◽  
pp. 50-66
Author(s):  
L. Gomathi Devi ◽  
B. G. Anitha
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Solar Light ◽  
Band Gap Engineering

Efficient Strategy to Enhance the Photocatalytic Activity of Ir-doped SrTiO3 : A Hybrid DFT Approach

2022 ◽  
Author(s):  
Brindaban Modak
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Water Splitting ◽  
Band Gap Engineering ◽  
Photocatalytic Water Splitting ◽  
Efficient Strategy

Photocatalytic water splitting using sunlight is one of the most promising approaches to produce hydrogen, for which an increasing focus has been directed towards band gap engineering of the existing...

Comparison of the Photocatalytic Activity of N-Doped, P-Doped Titania under Solar Light Irradiation

2010 ◽  
Vol 113-116 ◽  
pp. 2141-2144
Author(s):  
Si Yao Guo ◽  
Bo Chi ◽  
Jin Bing Sun ◽  
Feng Lu Wang ◽  
Lin Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Band Gap Energy ◽  
Light Irradiation ◽  
Solar Light ◽  
Urea Solution ◽  
Solar Light Irradiation ◽  
N Doping ◽  
Doped Titania ◽  
Band Gap Narrowing

P-, N-doped titania were synthesized by the direct hydrothermal method, which phosphorus from phosphoric acid and the following nitridation from urea solution. The resulting materials were characterized by XRD, XPS analysis, and their photocatalytic activities were tested by the solar light irradiation. N-doping titania resulted in the band-gap narrowing with improved photocatalytic activity. However, the phosphated titania exhibited higher photocatalytic activity than the N-doped one, but with larger band-gap energy.

scholarly journals Group-IVA element-doped SrIn2O4 as potential materials for hydrogen production from water splitting with solar energy

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 32317-32324
Author(s):  
Hai-Cai Huang ◽  
Chuan-Lu Yang ◽  
Mei-Shan Wang ◽  
Xiao-Guang Ma ◽  
You-Gen Yi
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Band Gap ◽  
Water Splitting ◽  
Hydrogen Generation ◽  
Band Gap Engineering ◽  
Group Iva

Band gap engineering can efficiently improve the photocatalytic activity of semiconductors for hydrogen generation from water splitting.

Band-Gap Engineering and Enhanced Photocatalytic Activity of Sm and Mn Doped BiFeO3Nanoparticles

2016 ◽  
Vol 100 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Syed Irfan ◽  
Yang Shen ◽  
Syed Rizwan ◽  
Huan-Chun Wang ◽  
Sadaf B. Khan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Band Gap Engineering ◽  
Mn Doped

Synthesis, Surface Acidity and Photocatalytic Activity of WO3/TiO2 Nanocomposites – An Overview

2014 ◽  
Vol 781 ◽  
pp. 63-78 ◽  
Author(s):  
S. Prabhu ◽  
A. Nithya ◽  
S. Chandra Mohan ◽  
Kandasamy Jothivenkatachalam
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Charge Separation ◽  
Surface Acidity ◽  
Band Gap Energy ◽  
Solar Light ◽  
Synthesis Methods ◽  
Light Spectrum ◽  
Gap Energy ◽  
Efficient Charge

Titania has been studied to be one of the best photocatalysts for the decomposition of many organic pollutants present in aqueous medium. Because of the wide band gap energy of TiO2 (3.2 eV) it can be activated only under UV light region which is present 4 % in the solar light spectrum. The photocatalytic activity of TiO2 was enhanced by means of several methods. TiO2 coupled with other semiconductor has gained additional importance, owing to improving the efficient charge separation by trapping the photogenerated electrons. WO3 is a better semiconductor having relatively lower band gap energy (2.8 eV) and absorb broad solar light spectrum. The formation of WOx monolayer on TiO2 notably increases the surface acidity of TiO2. This increasing the surface acidity of WO3/TiO2 photocatalyst facilitates the adsorption of the more hydroxyl group in addition to more organic reactants on its surface which obviously facilitate the enhancement of photocatalytic activity. In this review, the synthesis methods and photocatalytic activity of some selected and unique results related to WO3/TiO2 photocatalyst were discussed. The efficient charge separation, increased absorption of the reactants by increasing the surface acidity and high aspect ratio structures of WO3/TiO2 are also reviewed.

Band gap engineering design for construction of energy-levels well-matched semiconductor heterojunction with enhanced visible-light-driven photocatalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (78) ◽  
pp. 41219-41227 ◽  
Author(s):  
Hongwei Huang ◽  
Shuobo Wang ◽  
Yihe Zhang ◽  
Paul K. Chu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Engineering Design ◽  
Energy Levels ◽  
Band Gap Engineering ◽  
Photocurrent Generation ◽  
Visible Light Driven

Energy-levels well-matched Mg1−xCuxWO4/Bi2WO6 heterojunction was constructed based on band gap engineering. It exhibits high visible-light photoactivity for RhB degradation and photocurrent generation.

g-C3N4/Bi4O5I2 2D–2D heterojunctional nanosheets with enhanced visible-light photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10895-10903 ◽  
Author(s):  
Na Tian ◽  
Yihe Zhang ◽  
Chengyin Liu ◽  
Shixin Yu ◽  
Min Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Engineering Design ◽  
Band Gap Engineering ◽  
No Removal ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic

The 2D–2D heterojunctional g-C3N4/Bi4O5I2 nanosheets were successfully constructed based on band gap engineering design. It exhibits high visible-light-driven photocatalytic activity for degradation of RhB and NO removal.

Photocatalytic Hydrogen Evolution over Pt/Co-TiO2 Photocatalysts

2020 ◽  
Vol 01 ◽  
Author(s):  
S. Akel ◽  
R. Dillert ◽  
D.W. Bahnemann
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Hydrogen Evolution ◽  
Molecular Hydrogen ◽  
Hydrogen Generation ◽  
Solar Light ◽  
Tio2 Photocatalysts ◽  
Photocatalytic Hydrogen Evolution ◽  
Doped Tio2 ◽  
Simulated Solar Light

Aims: cobalt doped TiO2 composites were synthesized with the aim to decrease the TiO2 band gap which results in enhanced visible absorption and then loaded with 1 wt.% of platinum for promoting the formation of molecular hydrogen. Background: Controversial results of the cobalt-based compounds create doubts about the photocatalytic activity of the cobalt doped TiO2 materials. Thus, cobalt doped TiO2 composites were synthesized, and the photocatalytic activity was checked for the hydrogen generation. Objective: The objective of this study is the synthesis of photocatalysts that are highly active for the photocatalytic hydrogen evolution. Methods: The TiO2 and Co-TiO2 photocatalysts were synthesized using two different methods that are reflux and hydrothermal synthesis. Additionally, The Pt deposition on the prepared TiO2 and Co-TiO2 catalysts (1 wt.% Pt) was performed by the photoplatinization method. Result: The results showed that the reduction of protons over bare TiO2 and Co-TiO2 materials is possible from the thermodynamic point of view. The evolution of molecular hydrogen from aqueous methanol employing 1 wt.% platinum loaded on 0.5 wt.% Co-TiO2 photocatalysts under simulated solar light irradiation was investigated. The platinized CoTiO2 composites along with the platinized TiO2 samples have shown high photocatalytic hydrogen evolution. Higher hydrogen evolution rates were determined in the presence of all platinized materials, and a maximum of 317 μmol h-1 is observed on a Pt/Co-TiO2 photocatalyst prepared by a hydrothermal method. Conclusion: EPR results confirmed that the defects observed in the sample prepared within the hydrothermal processing were in the surface and have better crystallinity, while the defects detected on the samples prepared by reflux synthesis were less crystalline. The nature of semiconductor materials was explored through the determination of the flatband potential using the Mott–Schottky equation. The Mott−Schottky analysis of electrochemical impedance measurements showed that all semiconductors were n-type semiconductors and that cobalt doping induces impurity level within the band gap of TiO2. The experimental results of photocatalytic hydrogen generation from methanol-reforming showed that the Co- doping does not affect the photocatalytic activity of both Pt/Co-TiO2 catalysts. Despite that, the Pt/Co-TiO2-HT was the best photocatalyst under simulated solar light and show a maximum hydrogen evolution rate of 317 ± 44 μmol h-1. Other: Based on the experimental results, a possible mechanism for the continuous photocatalytic activity of Pt/Co-TiO2 photocatalysts under simulated solar light is proposed.

Highly efficient visible-light-driven reduction of Cr(vi) from water by porphyrin-based metal–organic frameworks: effect of band gap engineering on the photocatalytic activity

2020 ◽  
Vol 10 (22) ◽  
pp. 7724-7733 ◽  
Author(s):  
Nayuesh Sharma ◽  
Arnab Kumar Dey ◽  
Rohit Y. Sathe ◽  
Ajay Kumar ◽  
Venkata Krishnan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Aqueous Phase ◽  
Metal Organic Frameworks ◽  
Photocatalytic Reduction ◽  
Band Gap Engineering ◽  
Highly Efficient ◽  
Visible Light Driven ◽  
Metal Organic

Highly efficient visible-light-assisted photocatalytic reduction of Cr(vi) to Cr(iii) from aqueous phase using Zr(iv)-porphyrin MOFs, Zr6(μ3-OH)8(OH)8(MTCPP)2, (PCN-222(M)) (M = H2, ZnII, CuII, NiII, CoII, FeIIICl, and MnIIICl) is presented.

Sign in / Sign up

Export Citation Format

Share Document