On stability and kinetics of Li-rich transition metal oxides and oxyfluorides

2020 ◽  
Vol 8 (16) ◽  
pp. 7956-7967 ◽  
Author(s):  
Holger Euchner ◽  
Jin Hyun Chang ◽  
Axel Groß
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Kinetics Of

Stability and kinetics of Li-rich transition metal oxides and oxyfluorides are extensively studied by DFT.

The influence of transition metal oxides on the kinetics of Li2O2oxidation in Li–O2batteries: high activity of chromium oxides

2014 ◽  
Vol 16 (6) ◽  
pp. 2297-2304 ◽  
Author(s):  
Koffi P. C. Yao ◽  
Yi-Chun Lu ◽  
Chibueze V. Amanchukwu ◽  
David G. Kwabi ◽  
Marcel Risch ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
High Activity ◽  
Transition Metal Oxides ◽  
Chromium Oxides ◽  
Kinetics Of

Theory of Doping in Studies of Defect Concentration and Transport Properties of Transition Metal Oxides and Sulphides

2015 ◽  
Vol 34 (5) ◽  
Author(s):  
Zbigniew Grzesik
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Oxidation Kinetics ◽  
Defect Formation ◽  
Defect Concentration ◽  
Defect Mobility ◽  
Enthalpy And Entropy ◽  
Kinetics Of

AbstractIn the present paper the theoretical basis and experimental verification of a method, enabling the calculation of defect concentration and their mobility in transition metal oxides and sulphides have been described. The idea of proposed method consists in determination of both these parameters in indirect way, i.e. in studying the influence of aliovalent metallic additions on the oxidation kinetics of a given metal (doping effect). It has been shown that from the results of oxidation kinetics of binary alloys, the enthalpy and entropy of defect formation and their migration can be calculated. These data, in turn, can be used for the calculation of defect concentration and defect mobility in pure, undoped oxides. Such a possibility has been illustrated on the example of nonstoichiometric nickel oxide, Ni

Synergetic Effect of Oxides on Hydrogen Reaction Kinetics of Magnesium Hydride

2007 ◽  
Vol 561-565 ◽  
pp. 1605-1608
Author(s):  
Aep Patah ◽  
Akito Takasaki ◽  
Janusz S. Szmyd
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Reaction Kinetics ◽  
Transition Metal Oxides ◽  
Hydrogen Absorption ◽  
Catalytic Effect ◽  
Synergetic Effect ◽  
Desorption Kinetics ◽  
Absorption Kinetics ◽  
Kinetics Of

The kinetics of hydrogen reaction (absorption and desorption) on the MgH2 have been reported to be improved significantly by addition of transition metal oxides as catalysts. Among the oxides reported previously, Cr2O3 seems to improve hydrogen absorption kinetics and Nb2O5 for desorption kinetics. The catalytic effect of addition of more than one oxide, however, has not been reported yet. We investigated the hydrogen reaction kinetics of ball milled MgH2 powders added with either Cr2O3 or ZnO together with Nb2O5. In absorption reaction, the hydrogen contents reached 6 wt% and 5.3 wt% in 5 min for the powders added with 1 mol% ZnO + 1 mol% Nb2O5 and with 1 mol% Cr2O3 + 1 mol% Nb2O5, respectively. Those powders desorbed hydrogen up to about 4.5 wt% in 20 min. The significant improvement was not expected if one of the oxides was added separately. The combination of two kinds of oxides might play an important role for improvement of reaction kinetics.

scholarly journals Toward the rational design of non-precious transition metal oxides for oxygen electrocatalysis

2015 ◽  
Vol 8 (5) ◽  
pp. 1404-1427 ◽  
Author(s):  
Wesley T. Hong ◽  
Marcel Risch ◽  
Kelsey A. Stoerzinger ◽  
Alexis Grimaud ◽  
Jin Suntivich ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Rational Design ◽  
Artificial Photosynthesis ◽  
Solar Fuels ◽  
Oxide Catalysts ◽  
Perovskite Oxide ◽  
Kinetics Of

The rational design of non-precious transition metal perovskite oxide catalysts holds exceptional promise for understanding and mastering the kinetics of oxygen electrocatalysis instrumental to artificial photosynthesis, solar fuels, fuel cells, electrolyzers, and metal–air batteries.

Hydriding Kinetics of Mixtures Containing Some 3d-Transition Metal Oxides and Magnesium*

1989 ◽  
Vol 164 (Part_2) ◽  
pp. 1261-1266 ◽  
Author(s):  
M. Khrussanova ◽  
M. Terzieva ◽  
P. Peshev ◽  
I. Konstanchuk ◽  
E. Ivanov
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Kinetics Of ◽  
Hydriding Kinetics

Kinetics of Catalytic Combustion of Propane on Transition Metal Oxides

1982 ◽  
Vol 27 (5-6) ◽  
pp. 171-181 ◽  
Author(s):  
RAVI PRASAD ◽  
LAWRENCE A. KENNEDY ◽  
ELI RUCKENSTEIN
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Catalytic Combustion ◽  
Kinetics Of

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.

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