Electrochemical Studies of the Mixed-Conductor System YBa2Cu307-δ

Oxygen mobility in the system YBa2Cu307-δ (0 ≤ 8 ≤ 1) has been studied by electrochemical methods over the temperature range 500 ≤ T ≤ 800 °C. The experimental cell consisted of a pellet of YBa2Cu307-δ sandwiched between an ionically-blocking Au film electrode and an electronically-blocking yttrium-stabilized zirconia electrolyte/Pt paste electrode. The concentration of mobile oxygen ions, c(02-), and the diffusion coefficient, D, were evaluated from potential step experiments. Coulometric titration studies were used to modify the oxygen content of the oxygen deficient (δ ≥ 0) material. These electrochemically-modified samples were further characterized by magnetic susceptibility measurements to monitor the effect of changes of oxygen content on the width and position of the superconducting transītion.

Download Full-text

All-solid-state direct carbon fuel cells with thin yttrium-stabilized-zirconia electrolyte supported on nickel and iron bimetal-based anodes

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2016.04.063 ◽

2016 ◽

Vol 41 (21) ◽

pp. 9048-9058 ◽

Cited By ~ 29

Author(s):

Fangyong Yu ◽

Yapeng Zhang ◽

Liang Yu ◽

Weizi Cai ◽

Lili Yuan ◽

...

Keyword(s):

Fuel Cells ◽

Solid State ◽

Stabilized Zirconia ◽

Zirconia Electrolyte ◽

Direct Carbon Fuel Cells

Download Full-text

Development of Zirconia Electrolyte Films on Porous Doped Lanthanum Manganite Cathodes by Electrophoretic Deposition

MRS Proceedings ◽

10.1557/proc-575-303 ◽

1999 ◽

Vol 575 ◽

Cited By ~ 1

Author(s):

R. N. Basu ◽

C. A. Randall ◽

M. J. Mayo

Keyword(s):

Solid Oxide Fuel Cells ◽

Electrophoretic Deposition ◽

Yttria Stabilized Zirconia ◽

Lanthanum Manganite ◽

Ceramic Powders ◽

Stabilized Zirconia ◽

Uniform Coating ◽

Cathode Tube ◽

Zirconia Film ◽

Zirconia Electrolyte

ABSTRACTElectrophoretic deposition (EPD) was explored as an inexpensive route for fabricating the 8mol% yttria stabilized zirconia electrolyte in solid oxide fuel cells (SOFCs). Normally, deposition of particulate ceramic powders onto a sintered porous surface yields a non uniform coating which, after sintering, results in porosity, surface roughness and cracking in the coating. To overcome this problem, the present study used a fugitive graphite interlayer between the porous air electrode supported (AES) cathode tube (doped-LaMnO3) and the deposited zirconia film. By this approach, a fairly dense green coating (˜ 60%) was obtained, which yielded a smooth surface and pore-free microstructure after sintering. Preliminary results on the effect of a fugitive interlayer on the unfired (green) and fired zirconia coatings are discussed.

Download Full-text

Non-ohmic conduction in sodium bismuth titanate: the influence of oxide-ion conduction

Physical Chemistry Chemical Physics ◽

10.1039/d0cp03987j ◽

2020 ◽

Vol 22 (36) ◽

pp. 20941-20950

Author(s):

F. Yang ◽

A. R. West ◽

D. C. Sinclair

Keyword(s):

Bismuth Titanate ◽

Critical Role ◽

Ohmic Conduction ◽

Conductivity Enhancement ◽

Oxygen Ions ◽

Maximum Conductivity ◽

Dc Bias ◽

Oxide Ion Conduction ◽

Oxide Ion ◽

Mobile Oxygen

A maximum conductivity enhancement of >2000% is achieved in Na0.5Bi0.51TiO3.015 under a small dc bias, in which the highly mobile oxygen ions and the electrode reactions play a critical role.

Download Full-text