From theory to experiment: BaFe0.125Co0.125Zr0.75O3−δ, a highly promising cathode for intermediate temperature SOFCs

2020 ◽  
Vol 8 (6) ◽  
pp. 3413-3420 ◽  
Author(s):  
Elena Sánchez-Ahijón ◽  
Rafael Marín-Gamero ◽  
Beatriz Molero-Sánchez ◽  
David Ávila-Brande ◽  
Alicia Manjón-Sanz ◽  
...  
Keyword(s):  
Specific Resistance ◽  
Intermediate Temperature ◽  
Area Specific Resistance

BaFe0.125Co0.125Zr0.75O3−δ perovskite is a novel and efficient MIEC electrode for IT-SOFCs. Symmetrical cells with an area-specific resistance of 0.13 Ω cm2 at 700 °C and 0.05 Ω cm2 at 800 °C have been prepared.

Polarization Resistances of (Ln1−xSrx)CoO3 (Ln=Pr, Nd, Sm, and Gd x=0, 0.3, 0.5, 0.7, and 1) as Cathode Materials for Intermediate Temperature-operating Solid Oxide Fuel Cells

2009 ◽  
Vol 6 (3) ◽  
Author(s):  
Jung Hyun Kim ◽  
Seung-Wook Baek ◽  
Joongmyeon Bae
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Cathode Materials ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
Temperature Operating ◽  
Polarization Resistances ◽  
Area Specific Resistance

This study focuses on cathode performances of (Ln1−xSrx)CoO3−δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1) for intermediate temperature-operating solid oxide fuel cells (IT-SOFCs, 600–800°C). (Ln1−xSrx)CoO3−δ powders as cathode materials for IT-SOFC, which can be operated between 600°C and 800°C were synthesized by the glycine-nitrate-process (GNP) method. The impedance spectroscopy method was used to investigate area specific resistance (ASR) and electrochemical properties of (Ln1−xSrx)CoO3−δ (Ln=Pr, Nd, Sm, and Gd, x=0, 0.3, 0.5, 0.7, and 1). Pr0.5Sr0.5CoO3−δ and Pr0.3Sr0.7CoO3−δ showed to 0.15 Ω cm2 of ASR at 700°C and Nd0.5Sr0.5CoO3−δ to 0.14 Ω cm2 at 700°C. Sm0.5Sr0.5CoO3−δ showed the lowest ASR values of 0.10 Ω cm2 on 10% Gd-doped cerium oxide at 700°C.

scholarly journals Ba0.5Sr0.5Co0.8Fe0.2O3–δ–La0.6Sr0.4Co0.8Fe0.2O3–δ Composite Cathode for Solid Oxide Fuel Cell

2016 ◽  
Vol 61 (3) ◽  
pp. 1483-1488 ◽  
Author(s):  
M. Mosiałek ◽  
A. Kędra ◽  
M. Krzan ◽  
E. Bielańska ◽  
M. Tatko
Keyword(s):  
Electrochemical Impedance ◽  
Specific Resistance ◽  
Weight Ratio ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Composite Cathodes ◽  
Area Specific Resistance ◽  
Ceria Electrolyte

Abstract Composite cathodes contain Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ were tested in different configuration for achieving cathode of area specific resistance lower than Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ cathodes. Electrodes were screen printed on samaria-doped ceria electrolyte half-discs and tested in the three electrode setup by the electrochemical impedance spectroscopy. Microstructure was observed by scanning electron microscopy. The lowest area specific resistance 0.46 and 2.77 Ω cm−2 at 700 °C and 600 °C respectively revealed composite cathode contain Ba0.5Sr0.5Co0.8Fe0.2O3–δ and La0.6Sr0.4Co0.8Fe0.2O3–δ in 1:1 weight ratio. The area specific resistance of this cathode is characterized by the lowest activation energy among tested cathodes.

scholarly journals Method to Measure Area Specific Resistance and Chromium Migration Simultaneously from Solid Oxide Fuel Cell Interconnect Materials

Fuel Cells ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 570-577 ◽  
Author(s):  
J. Tallgren ◽  
O. Himanen ◽  
M. Bianco ◽  
J. Mikkola ◽  
O. Thomann ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Area Specific Resistance

Influence of Partial Substitution of Ba2+ for Sm3+ on the Structure and Electrochemical Properties of Sm 0.5-xBaxSr0.5Co0.8Fe 0.2O3-δPerovskite

2011 ◽  
Vol 239-242 ◽  
pp. 552-557
Author(s):  
Yan Hua Wang ◽  
Xi Wen Song ◽  
Fen Zhou ◽  
Jian Quan Gao ◽  
Sheng Li An
Keyword(s):  
Thermal Expansion ◽  
Electrochemical Properties ◽  
Specific Resistance ◽  
Sol Gel ◽  
Partial Substitution ◽  
Impedance Method ◽  
Orthorhombic Symmetry ◽  
Expansion Behavior ◽  
Composite Cathodes ◽  
Area Specific Resistance

Sm0.5-xBaxSr0.5Co0.8Fe0.2O3-δpowders were synthesized by a sol-gel method. The crystal structure and thermal expansion coefficient of Sm0.5-xBaxSr0.5Co0.8Fe0.2O3-δ(SBSCF,x=0.00, 0.05, 0.10) were investigated. All samples were the perovskite structure with an orthorhombic symmetry and exhibited a similar thermal expansion behavior. The electrochemical properties of SBSCF-SDC composite cathodes were studied using A.C. impedance method. The substitution of Ba2+for Sm3+had a significant effect on the area specific resistance of the composite cathodes. The area specific resistance (ASR) decreased with the increase of Ba2+substitution. This result suggested that the electrochemical performance of Sm0.5Sr0.5Co0.8Fe0.2O3-δbased cathode improved as Sm3+is partially substituted by Ba2+.

Area specific resistance of oxide scales grown on ferritic alloys for solid oxide fuel cell interconnects

2011 ◽  
Vol 196 (17) ◽  
pp. 7136-7143 ◽  
Author(s):  
Stefan Megel ◽  
Egle Girdauskaite ◽  
Viktar Sauchuk ◽  
Mihails Kusnezoff ◽  
Alexander Michaelis
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Specific Resistance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Oxide Scales ◽  
Ferritic Alloys ◽  
Area Specific Resistance

Effect of Ti Addition on Oxidation Behavior and Area Specific Resistance of Fe-20Cr Alloys for SOFC Interconnects

2014 ◽  
Vol 660 ◽  
pp. 249-253 ◽  
Author(s):  
Zaka Ruhma ◽  
Asep Ridwan Setiawan ◽  
Aditianto Ramelan ◽  
Rochim Suratman
Keyword(s):  
Oxidation Behavior ◽  
Specific Resistance ◽  
Parabolic Rate Constant ◽  
Xrd Analysis ◽  
Oxidation Rates ◽  
Air Atmosphere ◽  
Ti Alloys ◽  
Initial Stage ◽  
Area Specific Resistance ◽  
Ti Addition

In this work, the oxidation behavior of Fe-20wt.%Cr alloys with different titanium contents: 0, 0.5, and 1 wt.% are studied as a function of time in air atmosphere. The samples were isothermally oxidized at 700°C for 24, 48, and 96 h in a box furnace. The area specific resistance of oxides formed at the alloys surface during oxidation is measured by four-point probe methods at 700°C for 24 h. For Ti containing alloys, surface morphology observation by SEM shows that a few of TiO2 particles formed on the top of Cr2O3 scales. Continous TiO2 layer was not formed at the alloys surface after oxidation. XRD analysis on the oxide scales of Fe-20Cr-Ti alloys confirms that Cr2O3 and TiO2 oxide formed on the alloys. Ti addition into the alloys increases the oxidation rates of alloys at the initial stages. Oxidation behavior of Fe-20Cr-0.5Ti and Fe-20Cr-1Ti alloys showed two regimes. The parabolic rate constant, kp (in gr2/cm4s) were 1.57 x 10-13 and 3.08 x 10-13 respectively for initial stage of oxidation then changed to-9 x 10-15 and-3 x 10-14 respectively for the remainder of the test. ASR measurement shows that the presence of Ti in the alloys decreases the electrical resistance up to 60%. Ti addition into Fe-Cr alloys affect the oxide growth rate and increase the conductivity of Cr2O3 scales.

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