Controllable synthesis of the defect-enriched MoO3-x nanosheets as an effective visible-light photocatalyst for the degradation of organic dyes

2021 ◽  
Author(s):  
Yuqi Zhang ◽  
Xiang Yu ◽  
Huan Liu ◽  
XInyi LIan ◽  
Bin Shang ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Transition Metal ◽  
Visible Light ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Organic Dyes ◽  
Controllable Synthesis ◽  
Visible Light Photocatalyst ◽  
Solvent Crystallization

Transition metal oxides (TMOs) are emerging as a promising class of photocatalysts for pollutants treatment. In this report, integrating the anti-solvent crystallization and thermal treatment, we develope a facile and...

Transition metal oxides supported onto silica gel as visible light-driven photocatalysts

2020 ◽  
Vol 46 (9) ◽  
pp. 3997-4015
Author(s):  
V. Sydorchuk ◽  
S. Levytska ◽  
N. Shcherban ◽  
S. Khalameida
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Oxides ◽  
Silica Gel ◽  
Transition Metal Oxides ◽  
Visible Light Driven

scholarly journals Visible light promoted photocatalytic water oxidation: effect of metal oxide catalyst composition and light intensity

2015 ◽  
Vol 5 (10) ◽  
pp. 4760-4764 ◽  
Author(s):  
Dominic Walsh ◽  
Noelia M. Sanchez-Ballester ◽  
Valeska P. Ting ◽  
Simon R. Hall ◽  
Lui R. Terry ◽  
...  
Keyword(s):  
Transition Metal ◽  
Light Intensity ◽  
Visible Light ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Water Oxidation ◽  
Oxide Catalyst ◽  
Low Cost ◽  
Catalyst Composition ◽  
Oxidation Effect

Simply prepared low-cost nanoparticulate transition metal oxides were used as catalysts in visible light promoted water oxidations. The activity using daylight equivalent light intensities was assessed.

scholarly journals Nanostructure sensitization of transition metal oxides for visible-light photocatalysis

2014 ◽  
Vol 5 ◽  
pp. 696-710 ◽  
Author(s):  
Hongjun Chen ◽  
Lianzhou Wang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Environmental Remediation ◽  
Carbon Nanostructures ◽  
Metal Nanostructures ◽  
Visible Light Photocatalysis ◽  
Visible Light Active ◽  
Underlying Mechanisms

To better utilize the sunlight for efficient solar energy conversion, the research on visible-light active photocatalysts has recently attracted a lot of interest. The photosensitization of transition metal oxides is a promising approach for achieving effective visible-light photocatalysis. This review article primarily discusses the recent progress in the realm of a variety of nanostructured photosensitizers such as quantum dots, plasmonic metal nanostructures, and carbon nanostructures for coupling with wide-bandgap transition metal oxides to design better visible-light active photocatalysts. The underlying mechanisms of the composite photocatalysts, e.g., the light-induced charge separation and the subsequent visible-light photocatalytic reaction processes in environmental remediation and solar fuel generation fields, are also introduced. A brief outlook on the nanostructure photosensitization is also given.

The effect of cation mixing controlled by thermal treatment duration on the electrochemical stability of lithium transition-metal oxides

2017 ◽  
Vol 19 (44) ◽  
pp. 29886-29894 ◽  
Author(s):  
Gang Sun ◽  
Xucai Yin ◽  
Wu Yang ◽  
Ailing Song ◽  
Chenxiao Jia ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Transition Metal ◽  
Electrochemical Performance ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Treatment Duration ◽  
Electrochemical Stability ◽  
Optimal Degree ◽  
Cation Mixing

An optimal degree of Ni2+occupancy in the lithium layer as “pillaring” that enhances the electrochemical performance of NMC materials.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

Problems with oxygen analysis in the system MgO-Al2O3-SiO2 with the electron microprobe

1992 ◽  
Vol 50 (2) ◽  
pp. 1624-1625
Author(s):  
Michel Fialin ◽  
Guy Rémond
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Electrostatic Charge ◽  
Carbon Layer ◽  
Sample Holder ◽  
Rock Matrix ◽  
Electrical Discharges ◽  
Thin Carbon ◽  
Beam Instabilities

Oxygen-bearing minerals are generally strong insulators (e.g. silicates), or if not (e.g. transition metal oxides), they are included within a rock matrix which electrically isolates them from the sample holder contacts. In this respect, a thin carbon layer (150 Å in our laboratory) is evaporated on the sections in order to restore the conductivity. For silicates, overestimated oxygen concentrations are usually noted when transition metal oxides are used as standards. These trends corroborate the results of Bastin and Heijligers on MgO, Al2O3 and SiO2. According to our experiments, these errors are independent of the accelerating voltage used (fig.l).Owing to the low density of preexisting defects within the Al2O3 single-crystal, no significant charge buildup occurs under irradiation at low accelerating voltage (< 10keV). As a consequence, neither beam instabilities, due to electrical discharges within the excited volume, nor losses of energy for beam electrons before striking the sample, due to the presence of the electrostatic charge-induced potential, are noted : measurements from both coated and uncoated samples give comparable results which demonstrates that the carbon coating is not the cause of the observed errors.

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