Microstructural and Electrical Conductivity Relationships in Alumina- Containing Yttria Stabilized Cubic Zirconia Used as a Solid Electrolyte in Solid Oxide Fuel Cells

2019 ◽  
Vol 9 (1) ◽  
pp. 505-513
Author(s):  
S. Tekeli ◽  
A. Kayis ◽  
O. Gurdal ◽  
M. Guru
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Electrolyte ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Cubic Zirconia

Structure, electrical, and thermal expansion properties of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ interconnect materials for intermediate temperature solid oxide fuel cells

2009 ◽  
Vol 24 (5) ◽  
pp. 1748-1755 ◽  
Author(s):  
Yen-Pei Fu ◽  
Hsin-Chao Wang
Keyword(s):  
Electrical Conductivity ◽  
Fracture Toughness ◽  
Grain Size ◽  
Thermal Expansion ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Thermal Expansion Coefficient ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Nickel Doping

The microstructure, lattice parameters, electrical conductivity, thermal expansion, and mechanical properties of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ (x = 0.03, 0.06, 0.09, 0.12) were systematically investigated in this work. Nickel doping of (La0.8Ca0.2)(Cr0.9Co0.1)O3–δ is an effective way of increasing the thermal expansion coefficient (TEC) and stabilizing the high-temperature phase transformation from rhombohedral to tetragonal. As the nickel-doped content increases, the TEC increases parabolically by TEC (x) (ppm/°C) = 10.575 + 63.3x−240x2 (x = 0.03−0.12). The electrical conductivity of (La0.8Ca0.2)(Cr0.9–xCo0.1Nix)O3–δ specimens increases systematically with increasing nickel substitution in the range of 0.03 ≤ x ≤ 0.09 and reaches a maximum for the composition of (La0.8Ca0.2)(Cr0.81Co0.1Ni0.09)O3–δ (σ850 °C ∼60.36 S/cm). There is a slight increase in the fracture toughness with increasing nickel doping content, and the fracture toughness is strongly affected by the grain size. It seems that there is an increase in the fracture toughness with decreasing grain size. However, the microhardness does not significantly depend on the grain size in this study. The (La0.8Ca0.2)(Cr0.81Co0.1Ni0.09)O3–δ specimen shows high electrical conductivity, a moderate thermal expansion coefficient, and nearly linear thermal expansion behavior from room temperature to 800 °C. It will be suitable for interconnect materials for intermediate temperature solid oxide fuel cells (IT-SOFCs).

Defect Chemistry and Electrical Conductivity of Sm-Doped La1–xSrxCoO3−δfor Solid Oxide Fuel Cells

2017 ◽  
Vol 121 (28) ◽  
pp. 15017-15027 ◽  
Author(s):  
Mårten E. Björketun ◽  
Ivano E. Castelli ◽  
Jan Rossmeisl ◽  
Thomas Olsen ◽  
Kenji Ukai ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Defect Chemistry ◽  
Solid Oxide ◽  
Oxide Fuel

Subsolidus phase equilibria in the La2O3−CeO2−Co2O3 system

1999 ◽  
Vol 14 (5) ◽  
pp. 1692-1694 ◽  
Author(s):  
Marko Hrovat ◽  
Janez Holc ◽  
Slavko Bernik
Keyword(s):  
Fuel Cells ◽  
Phase Equilibria ◽  
Solid Oxide Fuel Cells ◽  
Solid Electrolyte ◽  
Ternary Compound ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Subsolidus Phase ◽  
Tie Line

Subsolidus equilibria in air in the La2O3−CeO2−Co2O3 system were studied with the aim to obtain information on possible interactions between LaCoO3-based cathode and CeO2-based solid electrolyte in solid oxide fuel cells (SOFC). No ternary compound was found. The tie line is between LaCoO3 and CeO2.

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