From insulator to oxide-ion conductor by a synergistic effect from defect chemistry and microstructure: acceptor-doped Bi-excess sodium bismuth titanate Na0.5Bi0.51TiO3.015

2020 ◽  
Vol 8 (47) ◽  
pp. 25120-25130
Author(s):  
Fan Yang ◽  
Julian S. Dean ◽  
Qiaodan Hu ◽  
Patrick Wu ◽  
Emilio Pradal-Velázquez ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Bismuth Titanate ◽  
Defect Chemistry ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Ceramic Microstructure ◽  
Excess Sodium ◽  
Low Levels ◽  
Oxide Ion

Low levels of acceptor-type dopants can introduce appreciable levels of oxide-ion conductivity into NB0.51T due to a synergistic effect from defect chemistry and ceramic microstructure.

scholarly journals Hexagonal perovskite related oxide ion conductor Ba3NbMoO8.5: phase transition, temperature evolution of the local structure and properties

2019 ◽  
Vol 7 (44) ◽  
pp. 25503-25510 ◽  
Author(s):  
Matthew S. Chambers ◽  
Kirstie S. McCombie ◽  
Josie E. Auckett ◽  
Abbie C. McLaughlin ◽  
John T. S. Irvine ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Local Structure ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Structure And Properties ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Reducing Conditions ◽  
Oxide Ion

Ba3NbMoO8.5 has recently been demonstrated to exhibit competitive oxide ion conductivity and to be stable under reducing conditions, making it an excellent potential electrolyte for solid oxide fuel cells.

Transition Metal D$ LaGaO3 Perovskite Fast Oxide Ion Conductor and Intermediate Temperature Solid Oxide Fuel Cell

1999 ◽  
Vol 575 ◽  
Author(s):  
Tatsumi Ishihara ◽  
Takaaki Shibayama ◽  
Miho Honda ◽  
Hiroyasu Nishiguchi ◽  
Yusaku Takita
Keyword(s):  
Transition Metal ◽  
Power Density ◽  
Ionic Conduction ◽  
Ion Conductivity ◽  
Large Power ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Wide Range ◽  
Oxide Ion

ABSTRACTDoping transition metal cation is known to enhance the electric conduction of solid electrolytes, however, the ionic conduction can be improved by doping the small amount of transition metal, in particular, doping Co is effective for improving the oxide ion conductivity. In this investigation, oxide ion conductivity of LaGaO3 based oxide doped with Co were investigated in detail. It was found that LaGaO3 doped with Co for Ga site (LSGMC) show a notable oxide ion conductivity over a wide range of oxygen partial pressures, although a hole conduction was appeared by addition of excess amount of Co. Considering the electrical conductivity and transport number of oxide ion, the optimized composition of LSGMC seems to be existed at La0.8.Sr0.2, Ga0.8,.Mg0.115 CO0.085O3. Power generation characteristics of fuel cells was greatly improved by using LSGMC for electrolyte and extremely large power density can be obtained on both H2- O2 and H2-air cells. In particular, the maximum power density was attained to a value of 1.53 and 0.50 W/cm2 at 1073 and 873 K, respectively, on H2–O2 cell when the thickness of electrolyte was 0.18 mm. Furthermore, almost similar large power density was attained when air was used as oxidant. The high power density of cell demonstrated in this study suggests that the operating temperature of SOFC can be decreased by using LSGMC for electrolyte.

High Oxide Ion Conductivity of (Ba1-x-ySrxLay)InO2.5+y/2 Members Derived from the Ba2In2O5 System

2005 ◽  
Vol 242-244 ◽  
pp. 159-168 ◽  
Author(s):  
Katsuyoshi Kakinuma ◽  
Hiroshi Yamamura ◽  
Tooru Atake
Keyword(s):  
Ion Mobility ◽  
Ion Conductivity ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Maximum Value ◽  
Solid Solution System ◽  
Perovskite Type ◽  
Oxide Ion ◽  
Key Parameter

We have discovered a high oxide ion conductor within the perovskite-type (Ba1-x-ySrxLay)InO2.5+y/2 solid-solution system. The system was derived from brownmillerite-type Ba2In2O5, which possessed a ordered oxide ion vacancies. When we doped La3+ into the Ba site, the vacancy changed to a disordered state. The oxide ion conductivity increased with the amount of doped La3+, reaching a maximum value of 0.12 (S/cm) at 800 oC in (Ba0.3Sr0.2La0.5)InO2.75, a level exceeding that of yttria-stabilized zirconia. The oxide ion conductivity of this system was strongly dependent on the unit cell free volume, which appears to be the key parameter governing oxide ion mobility.

Sr3−3xNa3xSi3O9−1.5x (x = 0.45) as a superior solid oxide-ion electrolyte for intermediate temperature-solid oxide fuel cells

2014 ◽  
Vol 7 (5) ◽  
pp. 1680-1684 ◽  
Author(s):  
Tao Wei ◽  
Preetam Singh ◽  
Yunhui Gong ◽  
John B. Goodenough ◽  
Yunhui Huang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Oxide Ion Conductors ◽  
Oxide Ion

A new solid oxide-ion conductor Sr3−3xNa3xSi3O9−1.5x (x = 0.45) exhibits the highest oxide-ion conductivity with the lowest activation energy among all the known chemically stable oxide-ion conductors.

Structure and oxide ion conductivity in tetragonal tungsten bronze BaBiNb5O15

RSC Advances ◽  
2015 ◽  
Vol 5 (88) ◽  
pp. 71890-71895 ◽  
Author(s):  
Hongqiang Ma ◽  
Kun Lin ◽  
Longlong Fan ◽  
Yangchun Rong ◽  
Jun Chen ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Tungsten Bronze ◽  
Ion Conductivity ◽  
Tetragonal Tungsten Bronze ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Total Electrical Conductivity ◽  
New Type ◽  
Oxide Ion

Tetragonal tungsten bronze compound, BaBiNb5O15, is found to be a new type of oxide ion conductor with a total electrical conductivity of 3 × 10−4 S cm−1 at 600 °C.

La1+xBa1–xGa3O7+0.5x Oxide Ion Conductor: Cationic Size Effect on the Interstitial Oxide Ion Conductivity in Gallate Melilites

2017 ◽  
Vol 56 (12) ◽  
pp. 6897-6905 ◽  
Author(s):  
Jungu Xu ◽  
Jiehua Wang ◽  
Xin Tang ◽  
Xiaojun Kuang ◽  
Matthew J. Rosseinsky
Keyword(s):  
Size Effect ◽  
Ion Conductivity ◽  
Ion Conductor ◽  
Oxide Ion Conductor ◽  
Oxide Ion Conductivity ◽  
Oxide Ion
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