scholarly journals Photocatalytic and Photoelectrochemical Water Splitting on TiO2via Photosensitization

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Saji Thomas Kochuveedu
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Uv Light ◽  
Solar Spectrum ◽  
Wide Bandgap ◽  
Oxidation Potential ◽  
Light Region ◽  
Narrow Bandgap ◽  
Visible Light Active ◽  
Bandgap Semiconductors

The search for an alternative to replace conventional fuel has been going on for years due to the limited storage of fossil fuel and excess CO2emission from the fuel. Using H2as fuel has gained wide attention recently, as well as consequently splitting of water into hydrogen and oxygen. Seminal semiconductors such as TiO2and ZnO have their position of CB and VB in alignment with water reduction and oxidation potential, respectively, but their wide bandgap allows them to absorb only UV light of the solar spectrum. Combining narrow bandgap semiconductors or other visible light active sensitizers with TiO2/ZnO is a facile route to exploit the visible light region of the solar spectrum. In this review, I make an attempt to summarize the various photosensitizers used in combination with TiO2for water splitting with recent reports as examples.

Synthesis and Characterization of Photocatalytic TiO2-ZnFe2O4 Nanoparticles

2005 ◽  
Vol 876 ◽  
Author(s):  
Sesha S. Srinivasan ◽  
Jeremy Wade ◽  
Elias K. Stefanakos
Keyword(s):  
Visible Light ◽  
Low Cost ◽  
Anatase Phase ◽  
Solar Spectrum ◽  
Rutile Phase ◽  
Oxidation Potential ◽  
Narrow Bandgap ◽  
Visible Wavelengths ◽  
Indoor Lighting

AbstractThe wide bandgap semiconductor TiO2 has become the dominant UV-activated photocatalyst in the field of air and water detoxification because of its high stability, low cost, high oxidation potential and chemically favorable properties. The demand for visible-light activated photocatalytic systems is increasing rapidly; however, currently, the efficiency and availability of photocatalysts that can be activated effectively by the solar spectrum and particularly indoor lighting is severely limited. In this paper, a new coprecipitation/hydrolysis synthesis route is used to create a TiO2-ZnFe2O4 nanocomposite that is directed towards extending the photoresponse of TiO2 from UV to visible wavelengths (>400nm). The effect of TiO2's accelerated anatase-rutile phase transformation due to the presence of the coupled ZnFe2O4 narrow bandgap semiconductor is evaluated. The transformation's dependence on pH, calcination temperature, particle size, and ZnFe2O4 concentration has been analyzed using XRD, SEM, and UV-Visible spectrometry. The requirements for retaining the highly photoactive anatase phase present in a ZnFe2O4 nanocomposite are outlined. The visible-light activated photocatalytic activity of the TiO2-ZnFe2O4 nanocomposites have been compared to an Aldrich TiO2 reference catalyst, using a solar-simulated photoreactor for the degradation of phenol.

Green Synthesis of ZnO/Dy/NiO Heterostructures for Enhanced Photocatalytic Applications

2020 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
Shubha Jayachamarajapura Pranesh ◽  
Diwya Lanka
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Combustion Method ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Hybrid Nanostructure ◽  
Wide Range ◽  
Visible Light Active ◽  
Textile Industries ◽  
Photocatalytic Applications

Background: Textile industries discharge harmful synthetic dyes to nearby water sources. These colour effluents should be treated before discharge to reduce the toxicity caused by synthetic colours. Objective: To synthesize visible light active superstructures to reduce water pollution caused by textile industries. Methods: We have successfully synthesized ZnO/Dy/NiO hybrid nanocomposites using waste curd as fuel by a simple combustion method. The obtained material was able to reduce recombination and enhanced the photocatalytic degradation of organic pollutants. The as-synthesized material was characterized by XRD, absorption spectroscopy, FESEM, EDAX, etc. The obtained hybrid nanostructure was used as a photocatalyst for the degradation of methylene blue under sunlight, UV light as well as in dark. Comparative experiments were carried out with a variation of catalytic load, pH, dye concentrations, etc. for a better understanding of the performance of the catalyst at various conditions. Results and Conclusion: The ternary compound shows wide range of absorption by expanding absorption band both in UV and visible regions. ZnO/Dy/NiO hybrid nanocomposites performed well and showed uniqueness in the activity uder visible light.

Hybrid Energy Conversion and Storage (HECS) Cells of the Composite Materials between Visible-Light Active Co(OH)2and UV-Light Active Ni(OH)2

2018 ◽  
Vol 85 (13) ◽  
pp. 1203-1217 ◽  
Author(s):  
Ketsuda Kongsawatvoragul ◽  
Saran Kalasina ◽  
Montakan Suksomboon ◽  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
...  
Keyword(s):  
Composite Materials ◽  
Visible Light ◽  
Energy Conversion ◽  
Uv Light ◽  
Hybrid Energy ◽  
Energy Conversion And Storage ◽  
Visible Light Active ◽  
And Storage

Visible light active and noble metal free Nb4N5/TiO2 nanobelt surface heterostructure for plasmonic enhanced solar water splitting

2020 ◽  
Vol 402 ◽  
pp. 126226 ◽  
Author(s):  
Yanchen Ji ◽  
Ruiqi Yang ◽  
Longwei Wang ◽  
Guoxin Song ◽  
Aizhu Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Noble Metal ◽  
Metal Free ◽  
Solar Water ◽  
Solar Water Splitting ◽  
Visible Light Active

Synthesis and Characterization of Plate-Like Cerium Phosphate via Soft Solution Processing

2006 ◽  
Vol 45 ◽  
pp. 668-672 ◽  
Author(s):  
Rui Xing Li ◽  
Shu Yin ◽  
Qing Tang ◽  
Tsugio Sato
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Visible Light Region ◽  
Reaction Products ◽  
Isothermal Temperature ◽  
Cerium Phosphate ◽  
Light Region ◽  
Sulfuric Acid Solutions ◽  
Good Feeling

Because of the low refractive indices, plate-like cerium phosphates (CePs) are expected to be used as one of active ingredients in personal suncare cosmetics. Plate-like Ce2(PO4)2HPO4･H2O particles were synthesized via solvothermal reactions of Ce(NH4)2(NO3)6 or Ce(SO4)2･4H2O in phosphoric acid with or without nitric acid and sulfuric acid solutions. The variation of morphology of Ce2(PO4)2HPO4･H2O particles significantly depended on the variety of cerium salt, isothermal temperature and time, although all reaction products consisted of plate-like particles. This plate-like compound showed excellent UV light absorption and transparency in the visible light region. Consequently, it is suggested that the plate-like Ce2(PO4)2HPO4･H2O particles might be used as suncare products to give an ideal optical effect of both UV-shielding ability and transparency in the visible light region, as well as a good feeling on the skin.

Photocatalytic and Photoelectro-Chemical Study of Ferrites for Water Splitting Applications: A Comparative Study

2012 ◽  
Vol 734 ◽  
pp. 334-348 ◽  
Author(s):  
Rekha Dom ◽  
Pramod H. Borse
Keyword(s):  
Comparative Study ◽  
Visible Light ◽  
Water Splitting ◽  
Chemical Study ◽  
Synthesis And Characterization ◽  
Material System ◽  
Computational Exploration ◽  
Visible Light Active

This article presents a comparative study on the synthesis and characterization of the binary and ternary ferrites for photocatalytic and photoelectrochemical applications. The importance and role of ferrite photocatalysts is discussed in context to the visible-light active photocatalyst applicationviz.for hydrogen productionvia.water-splitting. It also demonstrates that computational-exploration of any material system is key to identify, and achieve visible-light active photocatalysts.

Enhancing visible-light photoelectrochemical water splitting through transition-metal doped TiO2 nanorod arrays

2014 ◽  
Vol 2 (42) ◽  
pp. 17820-17827 ◽  
Author(s):  
Chengzhi Wang ◽  
Zhuo Chen ◽  
Haibo Jin ◽  
Chuanbao Cao ◽  
Jingbo Li ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Water Splitting ◽  
Photoelectrochemical Water Splitting ◽  
Transition Metal Doping ◽  
Nanorod Arrays ◽  
Visible Light Region ◽  
Light Region ◽  
Tio2 Nanorod Arrays ◽  
Metal Doped

Transition metal doping substantially improves the performance of TiO2 nanorods for photoelectrochemical water splitting in the visible light region.

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