Controlled oxygen vacancy engineering on In2O3−x/CeO2−y nanotubes for highly selective and efficient electrocatalytic nitrogen reduction

2020 ◽  
Vol 7 (19) ◽  
pp. 3609-3619
Author(s):  
Zengyao Wang ◽  
Jianfeng Shen ◽  
Wenzhi Fu ◽  
Jiangwen Liao ◽  
Juncai Dong ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Oxygen Vacancies ◽  
Reduction Reaction ◽  
Nitrogen Reduction

Introducing and adjusting the oxygen vacancies (VO) of transition metal oxides has been proposed as a significant and effective way to tackle the sluggish nitrogen reduction reaction (NRR) in the electrocatalysis process.

Electro-forming of vacancy-doped metal-SrTiO3-metal structures

2011 ◽  
Vol 1337 ◽  
Author(s):  
Florian Hanzig ◽  
Juliane Seibt ◽  
Hartmut Stoecker ◽  
Barbara Abendroth ◽  
Dirk C. Meyer
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Physical Vapor Deposition ◽  
Oxygen Vacancies ◽  
Vacuum Annealing ◽  
Metal Insulator ◽  
Metal Structures ◽  
Wide Range ◽  
Metal Insulator Metal

ABSTRACTResistance switching in metal – insulator - metal (MIM) structures with transition metal oxides as the insulator material is a promising concept for upcoming non-volatile memories. The electronic properties of transition metal oxides can be tailored in a wide range by doping and external fields. In this study SrTiO3 single crystals are subjected to high temperature vacuum annealing. The vacuum annealing introduces oxygen vacancies, which act as donor centers. MIM stacks are produced by physical vapor deposition of Au and Ti contacts on the front and rear face of the SrTiO3 crystal. The time dependent forming of the MIM stacks under an external voltage is investigated for crystals with varying bulk conductivities. For continued formation, the resistivity increases up to failure of the system where no current can be measured anymore and switching becomes impossible.

scholarly journals Understanding the Nature of Ammonia Treatment to Synthesize Oxygen Vacancy-Enriched Transition Metal Oxides

Chem ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 376-389 ◽  
Author(s):  
Dali Liu ◽  
Changhong Wang ◽  
Yifu Yu ◽  
Bo-Hang Zhao ◽  
Weichao Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxygen Vacancy ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Ammonia Treatment

scholarly journals Binary and Ternary 3D nanobundles Transition Metal Oxides Functionalized Carbon Xerogels as Electrocatalysts toward Oxygen Reduction Reaction

2020 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Transition Metal Oxides ◽  
Reduction Reaction ◽  
Excellent Performance ◽  
Carbon Xerogel ◽  
Carbon Xerogels

This work describes preparation of novel binary and ternary transition metal oxides functionalized carbon xerogel. The characterization data reveals that the functionalized metal oxides are in the form of nanobundles with different lengths and widths. these prepared electrocatalysts show excellent performance as electrocatalysts for oxygen reduction reaction.

scholarly journals Binary and Ternary 3D nanobundles Transition Metal Oxides Functionalized Carbon Xerogels as Electrocatalysts toward Oxygen Reduction Reaction

2020 ◽  
Author(s):  
Abdalla Abdelwahab ◽  
Francisco Carrasco-Marín ◽  
Agustín F. Pérez-Cadenas
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Transition Metal Oxides ◽  
Reduction Reaction ◽  
Excellent Performance ◽  
Carbon Xerogel ◽  
Carbon Xerogels

This work describes preparation of novel binary and ternary transition metal oxides functionalized carbon xerogel. The characterization data reveals that the functionalized metal oxides are in the form of nanobundles with different lengths and widths. these prepared electrocatalysts show excellent performance as electrocatalysts for oxygen reduction reaction.

Ti3C2 supported transition metal oxides and silver as catalysts toward efficient electricity generation in microbial fuel cell

2021 ◽  
Author(s):  
Xinghong Wang ◽  
Xiaobo Gong ◽  
Liu Chen ◽  
Siyu Li ◽  
Jinlin Xie ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Microbial Fuel Cell ◽  
Transition Metal Oxides ◽  
Electricity Generation ◽  
Reduction Reaction ◽  
Air Cathode

Oxygen reduction reaction (ORR) has been regarded as a bottleneck in air-cathode microbial fuel cell (MFC). Herein, transition metal oxides and silver were used to combine with conductive and hydrophilic...

Transition metal oxide-based oxygen reduction reaction electrocatalysts for energy conversion systems with aqueous electrolytes

2018 ◽  
Vol 6 (23) ◽  
pp. 10595-10626 ◽  
Author(s):  
Yejian Xue ◽  
Shanshan Sun ◽  
Qin Wang ◽  
Zhenghao Dong ◽  
Zhaoping Liu
Keyword(s):  
Transition Metal ◽  
Oxygen Reduction Reaction ◽  
Metal Oxides ◽  
Oxygen Reduction ◽  
Electric Vehicles ◽  
Transition Metal Oxides ◽  
Reduction Reaction ◽  
Aqueous Electrolytes ◽  
Power Sources ◽  
Energy Conversion Systems

This review concerning transition-metal-oxides-based electrocatalysts for the oxygen reduction reaction in metal–air batteries will encourage the enthusiasm of researchers to develop efficient catalysts for power sources used in electric vehicles.

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.

Sign in / Sign up

Export Citation Format

Share Document