scholarly journals Evaluation of Exchange Current Density for LSM Porous Cathode Based on Measurement of Three-Phase Boundary Length

2015 ◽  
Vol 68 (1) ◽  
pp. 657-664 ◽  
Author(s):  
K. Miyoshi ◽  
T. Miyamae ◽  
H. Iwai ◽  
M. Saito ◽  
M. Kishimoto ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Current Density ◽  
Exchange Current ◽  
Exchange Current Density ◽  
Porous Cathode ◽  
Boundary Length ◽  
Three Phase ◽  
Three Phase Boundary

Three-phase boundary length in solid-oxide fuel cells: A mathematical model

2008 ◽  
Vol 178 (1) ◽  
pp. 368-372 ◽  
Author(s):  
Vinod M. Janardhanan ◽  
Vincent Heuveline ◽  
Olaf Deutschmann
Keyword(s):  
Mathematical Model ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Phase Boundary ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Boundary Length ◽  
Three Phase ◽  
Three Phase Boundary

A Quantitative Tunneling/Desorption Model for the Exchange Current at the Porous Electrode/Beta"- Alumina/Alkali Metal Gas Three Phase Zone at 700–1300K

1996 ◽  
Vol 453 ◽  
Author(s):  
R. M. Williams ◽  
M. A. Ryan ◽  
C. Saipetch ◽  
H. G. LeDuc
Keyword(s):  
Alkali Metal ◽  
Phase Boundary ◽  
Electron Tunneling ◽  
Exchange Current ◽  
Physical Parameters ◽  
Reaction Site ◽  
Alumina Surface ◽  
Three Phase ◽  
Beta Alumina ◽  
Three Phase Boundary

AbstractThe exchange current observed at porous metal electrodes on sodium or potassium beta"-alumina solid electrolytes in alkali metal vapor is quantitatively modeled with a multi-step process with good agreement with experimental results. No empirically adjusted parameters were used, although some physical parameters have poor precision. Steps include: (1) diffusion of Na+ ions to the reaction site; (2) stretching of the Na+ ionic bond with the β3"-alumina surface to reach a configuration suitable for accepting an electron to form a surface bound Na0 atom; (3) electron tunneling from the Mo electrode to the ions; and (4) desorption of Na0 atoms weakly bound at the reaction site on the β"-alumina surface; (5) electron tunneling between Na0 or Na+ on the defect block and (6) Na0 and/or Na+ mobility on the spinel block surface may extend the reaction area substantially.The rate is increasingly dominated by the region close to the three-phase boundary as temperature increases and the rate near the three-phase boundary increases fastest, because desorption has a higher energy than reorganization. At high temperatures, surface diffusion of Na+ ions from the defect block edges to the spinel block edges is responsible for an increase in the total effective reaction zone area near the three-phase boundary.

Mixed potential type YSZ-based NO2 sensors with efficient three-dimensional three-phase boundary processed by electrospinning

2022 ◽  
Vol 354 ◽  
pp. 131219
Author(s):  
Siyuan Lv ◽  
Yueying Zhang ◽  
Li Jiang ◽  
Lianjing Zhao ◽  
Jing Wang ◽  
...  
Keyword(s):  
Phase Boundary ◽  
Three Dimensional ◽  
Mixed Potential ◽  
Potential Type ◽  
Three Phase ◽  
Three Phase Boundary
Sign in / Sign up

Export Citation Format

Share Document