New Insights on Photocatalytic H2 Liberation from Water Using Transition-Metal Oxides: Lessons from Cluster Models of Molybdenum and Tungsten Oxides

2013 ◽  
Vol 135 (45) ◽  
pp. 17039-17051 ◽  
Author(s):  
Raghunath O. Ramabhadran ◽  
Jennifer E. Mann ◽  
Sarah E. Waller ◽  
David W. Rothgeb ◽  
Caroline C. Jarrold ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Cluster Models ◽  
Tungsten Oxides ◽  
And Tungsten

Solvothermal Pathways to Transition Metal Oxides

2005 ◽  
Vol 878 ◽  
Author(s):  
Alexej Michailovski ◽  
Greta R. Patzke
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Alkali Halides ◽  
Tungsten Oxides ◽  
Temperature Range ◽  
One Step ◽  
The Individual ◽  
And Tungsten

AbstractA straightforward solvothermal pathway towards anisotropic nanoscale molybdenum, vanadium and tungsten oxides has been established. They are formed quantitatively from one-step procedures within a few days or hours of autoclave treatment in the temperature range between 100 and 220 °C. The addition of straightforward ionic additives (e.g. alkali halides) leads to a versatile interplay between the formation of novel polymolybdates(VI) and the production of oxidic nanoparticles. Key solvothermal features (role of the precursor, solvothermal parameter window, influence of ionic additives) of the individual transition metal oxides are investigated with respect to the development of general synthetic guidelines and predictive concepts.

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.

CVD - technology of transition metal oxides and their impact on solar energy utilization

1993 ◽  
Vol 03 (C3) ◽  
pp. C3-475-C3-483 ◽  
Author(s):  
K. A. GESHEVA ◽  
D. S. GOGOVA
Keyword(s):  
Transition Metal ◽  
Solar Energy ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Energy Utilization ◽  
Solar Energy Utilization

scholarly journals Electronic Phenomena of Transition Metal Oxides

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 256
Author(s):  
Christian Rodenbücher ◽  
Kristof Szot
Keyword(s):  
Solid State ◽  
Transition Metal ◽  
Metal Oxides ◽  
Real World ◽  
Transition Metal Oxides ◽  
Major Research ◽  
Research Fields ◽  
Real World Applications

Transition metal oxides with ABO3 or BO2 structures have become one of the major research fields in solid state science, as they exhibit an impressive variety of unusual and exotic phenomena with potential for their exploitation in real-world applications [...]

Generalized Synthetic Strategy for Amorphous Transition Metal Oxides‐Based 2D Heterojunctions with Superb Photocatalytic Hydrogen and Oxygen Evolution

2020 ◽  
pp. 2009230
Author(s):  
Bing‐Xin Zhou ◽  
Shuang‐Shuang Ding ◽  
Kang‐Xin Yang ◽  
Jing Zhang ◽  
Gui‐Fang Huang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Oxygen Evolution ◽  
Transition Metal Oxides ◽  
Synthetic Strategy

Recent advances of layered-transition metal oxides for energy-related applications

2021 ◽  
Vol 36 ◽  
pp. 514-550
Author(s):  
Zhihao Lei ◽  
Jang Mee Lee ◽  
Gurwinder Singh ◽  
C.I. Sathish ◽  
Xueze Chu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Recent Advances ◽  
Layered Transition Metal

PVP-assisted synthesis of ultrafine transition metal oxides encapsulated in nitrogen-doped carbon nanofibers as robust and flexible anodes for sodium-ion batteries

Carbon ◽  
2021 ◽  
Vol 174 ◽  
pp. 325-334
Author(s):  
Qingshan Zhao ◽  
Zhengzheng Xia ◽  
Tong Qian ◽  
Xianchao Rong ◽  
Mei Zhang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Carbon Nanofibers ◽  
Transition Metal Oxides ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon
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