Electrical conductivity and performance of doped LaCrO3 perovskite oxides for solid oxide fuel cells

Jiang, San Ping; Liu, Li; Ong, Khuong P.; Wu, Ping; Li, Jian; Pu, Jian

doi:10.1016/j.jpowsour.2007.10.053

Cited by 181 publications

(81 citation statements)

References 28 publications

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“…[1][2][3][4] As the thermal expansions of LaCrO 3 -based interconnect and conventional perovskite cathode materials are similar, and Cr-diffusion into the cathode from LaCrO 3 -based interconnects is significantly lower than from Cr-containing metallic interconnects, recently Sr-, V-doped [5] and Zn-doped [6] La 1-x Ca x CrO 3-d have been considered as promising alternative interconnect materials for SOFC. Furthermore alkaline earth containing LaCrO 3 has been proposed as a cathode material in a recent study by Jiang et al [7] The present thermodynamic assessment of the La-Cr-O system lays the groundwork for extension to a thermodynamic La-Sr-Mn-Cr-O oxide database that is required to understand the thermodynamics of SOFC degradation by chromium. It is also a starting point for extensions to thermodynamic databases with additional components serving as dopants in LaCrO 3 for SOFC interconnect and cathode applications.…”

Section: Introductionmentioning

confidence: 84%

Thermodynamic Assessment of the La-Cr-O System

Povoden

Chen

Grundy³

et al. 2008

J. Phase Equilib. Diffus.

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The La-Cr and the La-Cr-O systems are assessed using the Calphad approach. The calculated La-Cr phase diagram as well as LaO 1.5 -CrO 1.5 phase diagrams in pure oxygen, air, and under reducing conditions are presented. Phase equilibria of the La-Cr-O system are calculated at 1273 K as a function of oxygen partial pressure. In the La-Cr system reported solubility of lanthanum in bcc chromium is considered in the modeling. In the La-Cr-O system the Gibbs energy functions of La 2 CrO 6 , La 2 (CrO 4 ) 3 , and perovskite-structured LaCrO 3 are presented, and oxygen solubilities in bcc and fcc metals are modeled. Emphasis is placed on a detailed description of the perovskite phase: the orthorhombic to rhombohedral transformation and the contribution to the Gibbs energy due to a magnetic order-disorder transition are considered in the model. The following standard data of stoichiometric perovskite are calculated: D f;oxides H 298K ðLaCrO 3 Þ = À 73:7 kJ mol À1 , and S 298 K ðLaCrO 3 Þ = 109:2 J mol À1 K À1 . The Gibbs energy of formation from the oxides, D f;oxides GðLaCrO 3 Þ = À 72:403 À 0:0034T (kJ mol 21 ) (1273-2673 K) is calculated. The decomposition of the perovskite phase by the reaction LaCrO 3 ! 1 2 La 2 O 3 + Cr + 3 4 O 2 ðgÞ " is calculated as a function of temperature and oxygen partial pressure: at 1273 K the oxygen partial pressure of the decomposition, p O 2 ðdecompÞ = 10 À20:97 Pa. Cation nonstoichiometry of La 1-x CrO 3 perovskite is described using the compound energy formalism (CEF), and the model is submitted to a defect chemistry analysis. The liquid phase is modeled using the two-sublattice model for ionic liquids.

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Section: Introductionmentioning

confidence: 84%

Thermodynamic Assessment of the La-Cr-O System

Povoden

Chen

Grundy³

et al. 2008

J. Phase Equilib. Diffus.

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“…Thus, the Sr concentration must be optimized and, moreover, the multiple doping studies can contribute for the stabilization of the properties of these lanthanum chromite-based ceramics. The additional doping with Mg resulted in the best densification condition (LCSCM system), although the synergetic action mechanism is not yet clear [17,18]. In fact, in mono-doped systems, Ca-doped LaCrO 3 expands more than Sr-doped LaCrO 3 does, because of greater ionic size difference between Ca and La than between Sr and La, contributing, in the second case, to the stability and densification of the ceramic body [6].…”

Section: Discussionmentioning

confidence: 99%

Development of lanthanum chromites-based materials for solid oxide fuel cell interconnects

Furtado

Oliveira

2008

Matéria (Rio J.)

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Lanthanum chromites (LaCrO 3 ) are the main materials used as interconnect for solid oxide fuel cells. However, there are several difficulties involved in the processing of these materials. The objective of this work is to investigate and to characterize the relationships between microstructural development process and the electro-thermal-mechanical behavior of earth-alkaline metals doped lanthanum chromites-based ceramics. Calcium and strontium doped lanthanum chromites-based ceramic powders were produced by solution-based method from respective metallic nitrates. Samples were prepared by pressing and sintering procedures. The phase composition was evaluated by X-ray diffraction and densification level by Archimedes method. The microstructural characterization was made by scanning electron microscopy, energy dispersive X-ray spectroscopy and thermal analysis techniques. Electrical tests were used to evaluate the electrical conductivity of the samples, and thermal expansion coefficient was determined by dilatometric measurements. The obtained experimental results corroborate the literature comments concerning the difficulty of lanthanum chromite-based ceramics with high densification level and evidence the great influence of the nature of the dopants on the sintering mechanism and the microstructural and electric characteristics of the produced ceramics. The best ones results, in terms of densification and homogeneity characteristics, had been gotten through multiple doping with calcium and strontium, and in sintering temperature conditions lower that the normally considered to pure or mono-doped lanthanum chromite-based ceramics.

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“…The total conductivity of LSCM was less than 30 and 1 S cm − 1 in air and H 2 , respectively. [ 275 ] It implies that the current collection is an issue for SOFC with LSCM anode. To mitigate this problem, Cu was impregnated to porous LSCM and Pt was sputtered as current collector.…”

Section: Perovskitementioning

confidence: 99%

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

Chan

Liu

et al. 2012

Advanced Energy Materials

278

159

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Solid oxide fuel cells (SOFC) are highly efficient energy conversion devices with the advantage of directly utilizing hydrocarbon fuels. Starting with a short introduction about the fuel challenges and early achievements in this field, this review paper focuses on advances in oxygen‐ion conducting electrolyte‐based SOFC during the last 15 years. Robust anodes immune to carbon deposition are a prerequisite for direct hydrocarbon SOFC. In this paper, direct hydrocarbon SOFC anode materials are classified into three general categories: Ni‐cermet, Cu‐cermet, and oxide‐based anodes. Oxide anodes are further classified in terms of their crystalline structures, namely fluorite, rutile, tungsten bronze, pyrochlore, perovskite, and double perovskite. Achievements and recent advances on these SOFC anodes are reviewed and discussed. The concluding remarks summarize the pros and cons of direct hydrocarbon SOFC anode materials along with the perspective of future research trends.

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Electrical conductivity and performance of doped LaCrO3 perovskite oxides for solid oxide fuel cells

Cited by 181 publications

References 28 publications

Thermodynamic Assessment of the La-Cr-O System

Thermodynamic Assessment of the La-Cr-O System

Development of lanthanum chromites-based materials for solid oxide fuel cell interconnects

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

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