Electrochemically Induced Characteristic Luminescence of Metal Ions at Anodic Valve Metal Oxides

1993 ◽  
Vol 140 (1) ◽  
pp. 84-91 ◽  
Author(s):  
E. A. Meulenkamp ◽  
J. J. Kelly ◽  
G. Blasse
Keyword(s):  
Metal Ions ◽  
Metal Oxides ◽  
Valve Metal

ChemInform Abstract: Electrochemically Induced Characteristic Luminescence of Metal Ions at Anodic Valve Metal Oxides.

ChemInform ◽  
2010 ◽  
Vol 24 (14) ◽  
pp. no-no
Author(s):  
E. A. MEULENKAMP ◽  
J. J. KELLY ◽  
G. BLASSE
Keyword(s):  
Metal Ions ◽  
Metal Oxides ◽  
Valve Metal

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.

scholarly journals Stability profiles of transition metal oxides in the oxygen evolution reaction in alkaline medium

2019 ◽  
Vol 7 (45) ◽  
pp. 25865-25877 ◽  
Author(s):  
Aliki Moysiadou ◽  
Xile Hu
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Oxygen Evolution ◽  
Alkaline Medium ◽  
Transition Metal Oxides ◽  
Oxygen Evolution Reaction ◽  
Electrolyte Solutions ◽  
Compositional Changes ◽  
Dynamic Exchange

Metal oxides undergo compositional changes due to a dynamic exchange of metal ions with the electrolyte solutions during the oxygen evolution reaction.

Electron Injection into Anodic Valve Metal Oxides

1972 ◽  
Vol 119 (11) ◽  
pp. 1531 ◽  
Author(s):  
N. I. Jaeger ◽  
G. P. Klein ◽  
B. Myrvaagnes
Keyword(s):  
Metal Oxides ◽  
Electron Injection ◽  
Valve Metal

Removal of Toxic Heavy Metal Ions (Pb, Cr, Cu, Ni, Zn, Co, Hg, and Cd) from Waste Batteries or Lithium Cells Using Nanosized Metal Oxides: A Review

2020 ◽  
Vol 20 (12) ◽  
pp. 7231-7254 ◽  
Author(s):  
Yuzhe Zhang ◽  
Bin Wang ◽  
Qian Cheng ◽  
Xinling Li ◽  
Zhongyu Li
Keyword(s):  
Heavy Metal ◽  
Iron Oxide ◽  
Metal Ions ◽  
Metal Oxides ◽  
Heavy Metal Ions ◽  
Ph Value ◽  
Reaction System ◽  
Toxic Heavy Metal ◽  
Adsorption Sites ◽  
Lithium Cells

How to remove harmful heavy metal ions from waste batteries or lithium cells efficiently has been the focus of scholars. More and more metal oxides had been used to deal with the pollution of heavy metal caused by waste batteries in recent years. Nanostructured metal oxides have great potential because of their large comparative areas. The adsorption for these heavy metal ions can be further improved by using modified metal oxides as adsorbents. At present, iron oxide is widely used in this field. Other metal oxides have also been studied in removing these heavy metal ions. Compared to other metal oxides, the adsorbents made of iron oxide are easy to be separated from the reaction system. pH value in the solution can affect the activity of adsorption sites on metal oxides adsorbents and change the distribution of ions in solution. As a result, pH value can significantly influence the adsorption of metal oxides adsorbents for heavy metal ions from waste batteries or lithium cells.

scholarly journals Boosting Electrochemical Performance of Hematite Nanorods via Quenching-Induced Alkaline Earth Metal Ion Doping

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1102
Author(s):  
Qin Chen ◽  
Yanan Chong ◽  
Mumin Rao ◽  
Ming Su ◽  
Yongcai Qiu
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Electrochemical Performances ◽  
Alkaline Earth Metal Ions ◽  
Ion Doping

Ion doping in transition metal oxides is always considered to be one of the most effective methods to obtain high-performance electrochemical supercapacitors because of the introduction of defective surfaces as well as the enhancement of electrical conductivity. Inspired by the smelting process, an ancient method, quenching is introduced for doping metal ions into transition metal oxides with intriguing physicochemical properties. Herein, as a proof of concept, α-Fe2O3 nanorods grown on carbon cloths (α-Fe2O3@CC) heated at 400 °C are rapidly put into different aqueous solutions of alkaline earth metal salts at 4 °C to obtain electrodes doped with different alkaline earth metal ions (M-Fe2O3@CC). Among them, Sr-Fe2O3@CC shows the best electrochemical capacitance, reaching 77.81 mF cm−2 at the current of 0.5 mA cm−2, which is 2.5 times that of α-Fe2O3@CC. The results demonstrate that quenching is a feasible new idea for improving the electrochemical performances of nanostructured materials.

Coating of uniform inorganic particles with polymers: III. Polypyrrole on different metal oxides

1995 ◽  
Vol 10 (5) ◽  
pp. 1327-1336 ◽  
Author(s):  
Chin-Lin Huang ◽  
Egon Matijevic
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Metal Oxides ◽  
Dissolution Process ◽  
Reductive Dissolution ◽  
Inorganic Particles ◽  
Ethanol Medium ◽  
Oxide Particles ◽  
Coated Spheres

Five kinds of uniform metal oxide particles (α-Fe2O3, CeO2, CuO, NiO, and SiO2) were coated with polypyrrole by reacting the dispersed solids with pyrrole in a water/ethanol medium without the use of a soluble oxidant. When the process was carried out in air, all particles were coated with the polymer, although the thickness of the layer varied on different cores. In CuO dispersions, independent polypyrrole particles were produced in addition to coated spheres. While oxygen is the major oxidant that initiates the polymerization of pyrrole, some metal oxides may also affect the reaction both in terms of the amount and the composition of the shell. Thus, α-Fe2O3 and SiO2 were found to be inactive in the polymerization, while CeCh and CuO react with the adsorbed pyrrole molecules through a reductive-dissolution process, in which the monomers are oxidized, causing a release of reduced metal ions.

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