Low Thermal Expansion RBa(Co,M)4O7Cathode Materials Based on Tetrahedral-Site Cobalt Ions for Solid Oxide Fuel Cells†

2010 ◽  
Vol 22 (3) ◽  
pp. 822-831 ◽  
Author(s):  
Jung-Hyun Kim ◽  
Arumugam Manthiram
Keyword(s):  
Thermal Expansion ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Tetrahedral Site ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Cobalt Ions ◽  
Low Thermal Expansion

CO2-tolerant (Y,Tb)Ba(Co,Ga)4O7 cathodes with low thermal expansion for solid oxide fuel cells

2019 ◽  
Vol 7 (14) ◽  
pp. 8540-8549 ◽  
Author(s):  
Ke-Yu Lai ◽  
Arumugam Manthiram
Keyword(s):  
Thermal Expansion ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Low Thermal Expansion ◽  
Oxide Cathodes ◽  
Catalytically Active

Catalytically active swedenborgite oxide cathodes with high CO2 tolerance, recovery capability, and low thermal expansions are demonstrated for IT-SOFCs.

scholarly journals Oxygen permeation, thermal expansion behavior and electrochemical properties of LaBa0.5Sr0.5Co2O5+δ cathode for SOFCs

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14487-14495 ◽  
Author(s):  
Adi Subardi ◽  
Kun-Yu Liao ◽  
Yen-Pei Fu
Keyword(s):  
Thermal Expansion ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electrochemical Properties ◽  
Double Perovskite ◽  
Oxygen Permeation ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Thermal Expansion Behavior ◽  
Expansion Behavior

In this study, the double perovskite LaBa0.5Sr0.5Co2O5+δ (LBSC55) is investigated as a potential cathode for solid oxide fuel cells (SOFCs).

Microstructure, Sinterability and Electrochemical Properties of a Sm-Sr-(Co,Fe,Ni)-O Cathode System for Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Seung-Wook Baek ◽  
Joongmyeon Bae
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Electrochemical Properties ◽  
Electrochemical Impedance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sofc Cathode ◽  
Low Thermal Expansion ◽  
Temperature Operating ◽  
The Relationship

Samarium (Sm) is a rare earth material that shows promise for use in cathodes of intermediate temperature-operating solid oxide fuel cells (IT-SOFCs). Perovskite-structured oxide containing Sm has very attractive electrocatalytic properties, and spinel-structured oxide generally exhibits low thermal expansion, indicating its suitability for application as a SOFC cathode. In this paper, the characteristics of the various Sm-based oxide materials (Sm-Sr-(Co,Fe,Ni)-O) deposited on Sm0.2Ce0.8O1.9 (SDC) electrolyte pellets were investigated in terms of their microstructure, sinterability and electrochemical properties. The relationship between the composition and the sintering temperature was studied and discussed. Results show that the substitution of iron (Fe) and nickel (Ni) in Co-sites affects the sinterability, adhesion to the electrolyte and electrochemical activity, such that the different sintering temperatures for these compositions should be considered. The microstructure and sinterability of the cathodes were investigated using a scanning electron microscope (SEM). Area specific resistance (ASR) values for all cathode compositions were measured using AC electrochemical impedance spectroscopy (EIS).

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).

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