Lanthanum Chromite‐Based Interconnects as Key Materials for SOFC Stack Development

Sakai, Natsuko; Yokokawa, Harumi; Horita, Teruhisa; Yamaji, Katsuhiko

doi:10.1111/j.1744-7402.2004.tb00151.x

Cited by 86 publications

(27 citation statements)

References 34 publications

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“…• C. [4][5][6][7] In recent years, progress in anode-supported planar design technology with thin electrolytes led to the reduction of operating temperatures below 800…”

mentioning

confidence: 99%

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Lee

Hong

Kim

et al. 2014

J. Electrochem. Soc.

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The major degradation issues of solid oxide fuel cells (SOFC) are associated with the oxide scale growth and Cr evaporation of the metallic interconnect. To address these challenges, a highly dense spinel oxide coating was fabricated on a ferritic stainless steel interconnect using a cost-competitive ceramic processing route. The nano-scale Mn 1.5 Co 1.5 O 4 spinel powder was synthesized using a glycine-nitrate method, and the particle agglomerates were effectively disintegrated by a high-energy attrition milling process. The spinel protective coating, which was applied by screen printing, was sintered to a nearly full density, without causing damage to the metallic substrate, by a high-temperature annealing process in a reducing environment, followed by re-oxidation at a moderate temperature. The dense spinel coating remarkably reduced the growth rate of chromia scale and restrained the evaporation of chromium species, as verified by area specific resistance (ASR) measurements and analysis on chromium distribution over the cross-section. Strong adhesion between the coating and substrate was confirmed after 500-hour operation. The sintering mechanism involved in reduction-oxidation heat-treatment was studied based on dilatometry measurements and microstructural features. The implication of the ASR change and the chromium migration for stability of practical SOFC stacks was discussed in detail.

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“…• C. [4][5][6][7] In recent years, progress in anode-supported planar design technology with thin electrolytes led to the reduction of operating temperatures below 800…”

mentioning

confidence: 99%

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Lee

Hong

Kim

et al. 2014

J. Electrochem. Soc.

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“…However, when the membrane gets sufficiently thin, surface kinetics instead of bulk conductivity limits the overall hydrogen flux, and further reduction of the thickness will not increase the hydrogen permeation rate. desirable for SOFC interconnect materials, and LaCrO 3 was therefore long considered among the most promising candidates for this purpose [13][14][15]. Costly fabrication is, however, considered a major drawback.…”

Section: Defect Transport Through a Membranementioning

confidence: 99%

Hydrogen flux in La0.87Sr0.13CrO3–δ

Vigen

Haugsrud

2014

Journal of Membrane Science

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“…According to the literature, Ca and Co substitutions effectively reduce the sintering temperature and match the TECs to other SOFCs components. 1,11,21 In this study, ionic substitutions were carried out on A sites for Ca, and B sites for Co and Ni. The effects of ionic substitutions for the A sites and B sites on the thermal expansion, electrical conductivity, and mechanical properties of (La 0.8 Ca 0.2 )(Cr 0.9-x Co 0.1 Ni x )O 3-d were systematical investigated.…”

Section: Introductionmentioning

confidence: 99%

Structure, electrical, and thermal expansion properties of (La_0.8Ca_0.2)(Cr_0.9–_xCo_0.1Ni_x)O_3–δinterconnect materials for intermediate temperature solid oxide fuel cells

Wang

2009

J. Mater. Res.

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The microstructure, lattice parameters, electrical conductivity, thermal expansion, and mechanical properties of (La 0.8 Ca 0.2 )(Cr 0.9-x Co 0.1 Ni x )O 3-d (x = 0.03, 0.06, 0.09, 0.12) were systematically investigated in this work. Nickel doping of (La 0.8 Ca 0.2 )(Cr 0.9 Co 0.1 ) O 3-d 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 + 63.3xÀ240x 2 (x = 0.03À0.12). The electrical conductivity of (La 0.8 Ca 0.2 )(Cr 0.9-x Co 0.1 Ni x )O 3-d specimens increases systematically with increasing nickel substitution in the range of 0.03 x 0.09 and reaches a maximum for the composition of (La 0.8 Ca 0.2 )(Cr 0.81 Co 0.1 Ni 0.09 )O 3-d (s 850 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 (La 0.8 Ca 0.2 )(Cr 0.81 Co 0.1 Ni 0.09 )O 3-d 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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Lanthanum Chromite‐Based Interconnects as Key Materials for SOFC Stack Development

Cited by 86 publications

References 34 publications

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Hydrogen flux in La0.87Sr0.13CrO3–δ

Structure, electrical, and thermal expansion properties of (La_0.8Ca_0.2)(Cr_0.9–_xCo_0.1Ni_x)O_3–δinterconnect materials for intermediate temperature solid oxide fuel cells

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Lanthanum Chromite‐Based Interconnects as Key Materials for SOFC Stack Development

Cited by 86 publications

References 34 publications

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Hydrogen flux in La0.87Sr0.13CrO3–δ

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

Contact Info

Product

Resources

About

Structure, electrical, and thermal expansion properties of (La_0.8Ca_0.2)(Cr_0.9–_xCo_0.1Ni_x)O_3–δinterconnect materials for intermediate temperature solid oxide fuel cells