Ionic Conductivity and Coordination Number of Cations in Ce1-xYxO2-x/2

2014 ◽  
Vol 633 ◽  
pp. 406-409
Author(s):  
Xiao Hu Xie ◽  
Kai Qi Liu ◽  
Fen Rong Yang ◽  
Yu Ding
Keyword(s):  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Lattice Parameter ◽  
Solid Oxide ◽  
Dynamics Simulation ◽  
Doped Ceria ◽  
Oxygen Conductivity ◽  
Coordination Numbers ◽  
Vacancy Ordering ◽  
Yttria Doped Ceria

Yttria doped ceria display higher ionic conductivity and stabilized phase which possess more advantage for solid oxide fuel cells. By using molecular dynamics simulation, the lattice parameter and oxygen conductivity of Ce1-xYxO2-x/2 (x = 0 - 0.65) at 1273 k have been investigated. Lattice parameters and ionic conductivity both increase with yttria doping while x < 0.15 but over doping of yttria lead to a decreasing trend on them. It is suggested that the closing distance of cation-anion is responsible for this decreasing. The coordination numbers of cations were also analyzed. The results showed that the vacancies prefer to locate near Y ions and vacancy ordering is independent with vacancy content.

Thickness effects of yttria-doped ceria interlayers on solid oxide fuel cells

2012 ◽  
Vol 218 ◽  
pp. 187-191 ◽  
Author(s):  
Zeng Fan ◽  
Jihwan An ◽  
Andrei Iancu ◽  
Fritz B. Prinz
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Yttria Doped Ceria

Some Structural Aspects of Ionic Conductivity in Co-Doped Ceria-Based Electrolytes

2013 ◽  
Vol 58 (4) ◽  
pp. 1355-1359 ◽  
Author(s):  
M. Dudek
Keyword(s):  
Solid Solution ◽  
Chemical Composition ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Solutions ◽  
Transference Number ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Co Doped

Abstract The sinters of co-doped ceria solid solutions with the formula of Ce0.85Sm0.15-x RxO1.9, where R = Y, Gd, Pr, Tb, Ox-0.15, were obtained from powders synthesised by Pechini method. The linear variation of cell parameter a vs. chemical composition was observed for Ce0.85Sm0:15-xRxO1.9, where R = Y, Gd, Tb, 0 <x<0.15 samples. However, the introduction of Pr3+ into Ce0.85Sm0.15-x PrxO1.9 caused a small deviation from linearity due to possible changes in the valence from Pr3+ to Pr4+. The determined values of oxide transference number tion for Ce0.85Sm0.15-xRxO1.9, R = Y, Gd in the temperature range 400-750°C and partial oxygen pressure from 10-6 to 1 atm were close to 1, which indicated that materials investigated exhibited practically pure ionic oxide conductivity. On the other hand, the introduction of Tb3+ or Pr3+ higher than x>0.05 into solid solution Ce0.85Sm0.15-xRxO1.9, R = Tb, Pr caused a decrease in the ionic transference number tion below 1 due to an increase in partial electronic conduction. This fact limiting investigated co-doped terbia and samaria or samaria and praseodymia ceria-based solid solutions for the further application as oxide electrolytes in solid oxide fuel cells. The analysis of bulk and grain boundary values indicated that partial substitution of Sm3+ by Y3+ or Gd3+ caused slight improvements in the ionic conductivity of Ce0.85Sm0.15-xRxO1.9. The highest ionic conductivity was found for solid solution with chemical composition Ce0.85Sm0.1Y0.05O1.9. The selected co-doped ceria samples were tested as solid electrolytes in solid oxide fuel cells operating in the intermediate temperature range 500-750°C.

Enhanced ionic conductivity in Gd-doped ceria and (Li/Na)2SO4 composite electrolytes for solid oxide fuel cells

2015 ◽  
Vol 49 ◽  
pp. 90-96 ◽  
Author(s):  
Chuangang Yao ◽  
Junling Meng ◽  
Xiaojuan Liu ◽  
Xiong Zhang ◽  
Xiliang Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Composite Electrolytes

Improving solid oxide fuel cells with yttria-doped ceria interlayers by atomic layer deposition

2011 ◽  
Vol 21 (29) ◽  
pp. 10903 ◽  
Author(s):  
Zeng Fan ◽  
Cheng-Chieh Chao ◽  
Faraz Hossein-Babaei ◽  
Fritz B. Prinz
Keyword(s):  
Fuel Cells ◽  
Atomic Layer Deposition ◽  
Solid Oxide Fuel Cells ◽  
Atomic Layer ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Layer Deposition ◽  
Yttria Doped Ceria

Study of glycine nitrate precursor method for the synthesis of gadolinium doped ceria (Ce0.8Gd0.2O1.90) as an electrolyte for intermediate temperature solid oxide fuel cells

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46602-46612 ◽  
Author(s):  
Shrikant Kulkarni ◽  
Siddhartha Duttagupta ◽  
Girish Phatak
Keyword(s):  
Ionic Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Combustion Method ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Precursor Method ◽  
Synthesis Parameters ◽  
Nitrate Precursor ◽  
Gadolinium Doped Ceria

This is a detailed study of the synthesis parameters and their effects on the physical properties and ionic conductivity of gadolinium-doped ceria prepared using a glycine nitrate precursor combustion method.

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