WITHDRAWN: Justification of the Schottky emission model at the interface of a precious metal and a perovskite oxide with dilute oxygen vacancies

2006 ◽  
Author(s):  
Ken Numata
Keyword(s):  
Precious Metal ◽  
Oxygen Vacancies ◽  
Schottky Emission ◽  
Perovskite Oxide ◽  
Emission Model

Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

2017 ◽  
Vol 46 (40) ◽  
pp. 13903-13911 ◽  
Author(s):  
Xiangzhi Cui ◽  
Ryan O'Hayre ◽  
Svitlana Pylypenko ◽  
Linlin Zhang ◽  
Liming Zeng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Precious Metal ◽  
Oxygen Vacancies ◽  
Low Cost ◽  
Cathode Catalyst ◽  
Methanol Tolerance ◽  
Efficient Catalyst ◽  
Metal Free ◽  
Redox Couples ◽  
Catalytic Stability

The redox couples Co4+/Co3+ and Fe3+/Fe2+, and oxygen vacancies in mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ endow the precious metal-free cathode catalyst with high ORR catalytic activity, and more importantly excellent methanol tolerance and electro-catalytic stability.

scholarly journals RESISTIVE SWITCHING PHENOMENA IN COMPLEX OXIDE HETEROSTRUCTURES

2013 ◽  
Vol 27 (29) ◽  
pp. 1330021 ◽  
Author(s):  
YU-LING JIN ◽  
KUI-JUAN JIN ◽  
CHEN GE ◽  
HUI-BIN LU ◽  
GUO-ZHEN YANG
Keyword(s):  
Resistive Switching ◽  
Oxygen Vacancies ◽  
Complex Oxide ◽  
Perovskite Oxide ◽  
Ferroelectric Polarization ◽  
Oxide Heterostructures ◽  
Polarization Voltage ◽  
Data Memory ◽  
Current Voltage

Resistive memories based on the resistive switching effect have promising application in the ultimate nonvolatile data memory field. This brief review focuses on the resistive switching phenomena in the perovskite oxide heterostructures, which originate from the modulation of the interface properties due to the movement of the oxygen vacancies and the ferroelectric polarization. Many recent experiments have been carried out to demonstrate the role of the oxygen vacancies by controlling the content of the oxygen vacancies in the oxide heterostructures with plenty of oxygen vacancies. The important role of the ferroelectric polarization was also carefully confirmed by analyzing the relationship between the current–voltage and polarization–voltage loops in the ferroelectric oxide heterostructures. The physical mechanisms have been revealed based on the developed numerical model.

scholarly journals Oxygen Vacancies in Perovskite Oxide Piezoelectrics

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5596
Author(s):  
Marina Tyunina
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Chemical Reactions ◽  
Oxygen Vacancies ◽  
Perovskite Oxide ◽  
Semiconductor Physics ◽  
Physical Conditions ◽  
Ferroelectric Behavior ◽  
Piezoelectric Performance ◽  
Mobile Oxygen

The excellent electro-mechanical properties of perovskite oxide ferroelectrics make these materials major piezoelectrics. Oxygen vacancies are believed to easily form, migrate, and strongly affect ferroelectric behavior and, consequently, the piezoelectric performance of these materials and devices based thereon. Mobile oxygen vacancies were proposed to explain high-temperature chemical reactions half a century ago. Today the chemistry-enabled concept of mobile oxygen vacancies has been extrapolated to arbitrary physical conditions and numerous effects and is widely accepted. Here, this popular concept is questioned. The concept is shown to conflict with our modern physical understanding of ferroelectrics. Basic electronic processes known from mature semiconductor physics are demonstrated to explain the key observations that are groundlessly ascribed to mobile oxygen vacancies. The concept of mobile oxygen vacancies is concluded to be misleading.

Boosting Nitrate Electroreduction to Ammonia on NbOx via Constructing Oxygen Vacancies

2022 ◽  
Author(s):  
Xuefei Wan ◽  
Weiwei Guo ◽  
Xue Dong ◽  
Hai-Hong Wu ◽  
Xiaofu Sun ◽  
...  
Keyword(s):  
Precious Metal ◽  
Oxygen Vacancies ◽  
Metal Catalyst

We have synthesized NbOx with oxygen vacancies (OVs) and conducted the first work for nitrate electroreduction to NH3 over Nb oxides. It was a robust non-precious metal catalyst for NH3...

Simultaneous visualization of oxygen vacancies and the accompanying cation shifts in a perovskite oxide by combining annular imaging techniques

2012 ◽  
Vol 100 (19) ◽  
pp. 193112 ◽  
Author(s):  
Shunsuke Kobayashi ◽  
Scott D. Findlay ◽  
Naoya Shibata ◽  
Teruyasu Mizoguchi ◽  
Yukio Sato ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Imaging Techniques ◽  
Perovskite Oxide ◽  
Simultaneous Visualization

Hole-Proton Mixed Conduction of Perovskite-Oxide Thin Film with Oxygen Vacancies and Lattice Distortion for SOFC Electrode

2017 ◽  
Vol 78 (1) ◽  
pp. 1973-1977
Author(s):  
Tohru Higuchi ◽  
Shoto Furuichi ◽  
Wataru Namiki ◽  
Makoto Takayanagi ◽  
Makoto Minohara ◽  
...  
Keyword(s):  
Thin Film ◽  
Oxygen Vacancies ◽  
Lattice Distortion ◽  
Perovskite Oxide ◽  
Oxide Thin Film ◽  
Mixed Conduction

scholarly journals Epitaxial growth of perovskite oxide films facilitated by oxygen vacancies

2021 ◽  
Author(s):  
Marina Tyunina ◽  
Leonid L. Rusevich ◽  
Eugene A Kotomin ◽  
O Pacherova ◽  
T Kocourek ◽  
...  
Keyword(s):  
Single Crystal ◽  
Metal Oxides ◽  
Epitaxial Growth ◽  
Oxygen Vacancies ◽  
Epitaxial Films ◽  
Perovskite Oxide ◽  
Abo3 Perovskite ◽  
Film Substrate ◽  
Perovskite Type ◽  
Advanced Applications

Single-crystal epitaxial films of technologically important and scientifically intriguing multifunctional ABO3 perovskite-type metal oxides are essential for advanced applications and understanding of these materials. In such films, a film-substrate misfit...

Toward Switchable Photovoltaic Effect via Tailoring Mobile Oxygen Vacancies in Perovskite Oxide Films

2016 ◽  
Vol 8 (50) ◽  
pp. 34590-34597 ◽  
Author(s):  
Chen Ge ◽  
Kui-juan Jin ◽  
Qing-hua Zhang ◽  
Jian-yu Du ◽  
Lin Gu ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Photovoltaic Effect ◽  
Oxide Films ◽  
Perovskite Oxide ◽  
Mobile Oxygen
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