A-Site and B-Site Charge Orderings in ans–dLevel Controlled Perovskite Oxide PbCoO3

2017 ◽  
Vol 139 (12) ◽  
pp. 4574-4581 ◽  
Author(s):  
Yuki Sakai ◽  
Junye Yang ◽  
Runze Yu ◽  
Hajime Hojo ◽  
Ikuya Yamada ◽  
...  
Keyword(s):  
Perovskite Oxide ◽  
A Site ◽  
Charge Orderings

scholarly journals Dramatic Influence of A-Site Nonstoichiometry on the Electrical Conductivity and Conduction Mechanisms in the Perovskite Oxide Na0.5Bi0.5TiO3

2015 ◽  
Vol 27 (2) ◽  
pp. 629-634 ◽  
Author(s):  
Ming Li ◽  
Huairuo Zhang ◽  
Stuart N. Cook ◽  
Linhao Li ◽  
John A. Kilner ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Perovskite Oxide ◽  
Conduction Mechanisms ◽  
A Site

A‐Site Management Prompts the Dynamic Reconstructed Active Phase of Perovskite Oxide OER Catalysts

2021 ◽  
Vol 11 (12) ◽  
pp. 2003755 ◽  
Author(s):  
Yu Sun ◽  
Ran Li ◽  
Xiaoxuan Chen ◽  
Jing Wu ◽  
Yong Xie ◽  
...  
Keyword(s):  
Active Phase ◽  
Perovskite Oxide ◽  
Site Management ◽  
A Site

scholarly journals Unusually Small Thermal Expansion of Ordered Perovskite Oxide CaCu3Ru4O12 with High Conductivity

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1650 ◽  
Author(s):  
Akihiro Tsuruta ◽  
Katsuhiro Nomura ◽  
Masashi Mikami ◽  
Yoshiaki Kinemuchi ◽  
Ichiro Terasaki ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Coefficient Of Thermal Expansion ◽  
Ceramic Materials ◽  
Vital Role ◽  
Perovskite Oxide ◽  
Conducting Composite ◽  
Conducting Oxides ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
A Site

We measured the coefficient of thermal expansion (CTE) of conducting composite ceramics 30 vol.% CuO-mixed CaCu3Ru4O12 together with CaCu3Ru4O12 and CuO. Although conducting ceramics tend to show higher CTE values than insulators, and its CTE value does not match with other ceramic materials, the CTE of CaCu3Ru4O12 (7–9 × 10−6/K) was as small as those of insulators such as CuO (9 × 10−6/K), alumina (8 × 10−6/K), and other insulating perovskite oxides. We propose that the thermal expansion of CaCu3Ru4O12 was suppressed by the Cu-O bond at the A-site due to the Jahn–Teller effect. This unusually small CTE of CaCu3Ru4O12 compared to other conducting oxides plays a vital role enabling successful coating of 30 vol.% CuO-mixed CaCu3Ru4O12 thick films on alumina substrates, as demonstrated in our previous study.

scholarly journals The Effect of Co-Doping at the A-Site on the Structure and Oxide Ion Conductivity in (Ba0.5−xSrx)La0.5InO3−δ: A Molecular Dynamics Study

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3739
Author(s):  
Kuk-Jin Hwang ◽  
Hae-Jin Hwang ◽  
Myung-Hyun Lee ◽  
Seong-Min Jeong ◽  
Tae Shin
Keyword(s):  
Molecular Dynamics ◽  
Ionic Conductivity ◽  
Dynamics Simulation ◽  
Perovskite Oxide ◽  
Ion Conductor ◽  
Oxygen Ions ◽  
Co Doping ◽  
Oxide Ion Conductivity ◽  
Oxygen Ion Conductor ◽  
A Site

A molecular dynamics simulation was used to investigate the structural and transport properties of a (Ba0.5−xSrx)La0.5InO3−δ (x = 0, 0.1, 0.2) oxygen ion conductor. Previous studies reported that the ionic conductivity of Ba-doped LaInO3 decreases because Ba dopant forms a narrow oxygen path in the lattice, which could hinder the diffusion of oxygen ions. In this study, we reveal the mechanism to improve ionic conductivity by Ba and Sr co-doping on an La site in LaInO3 perovskite oxide. The results show that the ionic conductivity of (Ba0.5−xSrx)La0.5InO3−δ increases with an increasing number of Sr ions because oxygen diffusion paths which contain Sr ions have a larger critical radius than those containing Ba ions. The radial distribution function (RDF) calculations show that the peak heights in compositions including Sr ions were lower and broadened, meaning that the oxygen ions moved easily into other oxygen sites.

Highly active hydrogen evolution catalysis on oxygen-deficient double-perovskite oxide PrBaCo2O6−δ

2020 ◽  
Vol 4 (5) ◽  
pp. 1519-1529 ◽  
Author(s):  
Hayato Togano ◽  
Kaisei Asai ◽  
Seiji Oda ◽  
Hidekazu Ikeno ◽  
Shogo Kawaguchi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Oxygen Deficiency ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Perovskite Oxide ◽  
Cation Ordering ◽  
Active Hydrogen ◽  
Multiple Factors ◽  
Highly Active ◽  
A Site

Oxygen-deficient double perovskite oxides PrBaCo2O6−δ exhibit highly active hydrogen evolution reaction catalysis, which is associated with multiple factors: oxygen deficiency, high Co valence, and A-site cation ordering.

scholarly journals Perovskite Chromite With In-Situ Assembled Ni-Co Nano-Alloys: A Potential Bifunctional Electrode Catalyst for Solid Oxide Cells

2021 ◽  
Vol 8 ◽  
Author(s):  
Zhishan Li ◽  
Lin Cui ◽  
Jingli Luo ◽  
Jianhui Li ◽  
Yifei Sun
Keyword(s):  
Fuel Cell ◽  
Electrode Materials ◽  
Carbon Deposition ◽  
Solid Oxide ◽  
Perovskite Oxide ◽  
Electrolysis Cell ◽  
Lanthanum Chromite ◽  
Term Operation ◽  
A Site

Solid oxide fuel cell (SOFC) is an advanced electricity generation device with attractive fuel flexibility and conversion efficiency. As its reversed process, solid oxide electrolysis cell (SOEC) can efficiently electrolyze notorious CO2 to valuable chemical product such as CO, by utilizing renewable energy. To achieve long-term operation, the development of catalytically active electrode materials in both SOFC/SOEC modes is highly desirable, yet still challenging. In this research, an A-site deficient perovskite oxide (lanthanum chromite) decorated with in-situ exsolved Ni-Co nano-alloy has been fabricated and applied as a potential fuel electrode for both SOFC/SOEC. The influences of A-site non-stoichiometry and B-site dopant concentration on structural properties and in-situ exsolution process have been elaborately studied from various aspects. Diverse characterizations collectively confirm that the existence of A-site deficiency helps the formation of oxygen vacancies and stimulates the exsolution of B-site cations. In addition, the synergistic effect between the dopants of Co and Ni manipulates the reducibility and promotes carbon deposition resistance of the material. The electrolyte-supported SOFC with self-assembled Ni-Co nano-alloy electrode has shown maximum power densities of 329 mW/cm2 (in H2) and 258 mW/cm2 (in syngas, H2 + CO) at 850 °C, which are 50% better than those of the fuel cell with the exsolved Ni nanoparticles only. Also, the nano-alloy decorated electrode catalyst promotes a 30% increase in SOEC performance for CO2 electrolysis with prominently enhanced resistance against carbon deposition, suggesting the versatile functionality of the materials.

Phase transition behaviour in the A-site deficient perovskite oxide La1/3NbO3

2004 ◽  
Vol 177 (12) ◽  
pp. 4552-4556 ◽  
Author(s):  
Brendan J. Kennedy ◽  
Christopher J. Howard ◽  
Yoshiki Kubota ◽  
Kenichi Kato
Keyword(s):  
Phase Transition ◽  
Perovskite Oxide ◽  
A Site ◽  
Transition Behaviour

A-site management and oxygen-deficient regulation strategy with perovskite oxide electrocatalyst for oxygen evolution reaction

2022 ◽  
Author(s):  
Changhai Liu ◽  
Dingwei Ji ◽  
Hong Shi ◽  
Zhenyu Wu ◽  
Hui Huang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Electronic Structures ◽  
Perovskite Oxides ◽  
Perovskite Oxide ◽  
Site Management ◽  
High Flexibility ◽  
A Site

Perovskite oxides (ABO3) as electrocatalysts applied for oxygen evolution reaction (OER) have been studied for decades due to its high flexibility and adjustability for electronic structures. Herein, a series of...

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