Properties of Cu, Ni, and V doped-LaCrO 3 interconnect materials prepared by pechini, ultrasonic spray pyrolysis and glycine nitrate processes for SOFC

Abstract

The ceramic interconnect,La 0.8 Sr 0.05 Ca 0.15 (Cr 1−x , B x )O 3 (B = Cu, Ni, V, x = 0.02, 0.1, 0.5) (LSCCB) powders were prepared by Pechini method, Ultrasonic Spray Pyrolysis (USP) and Glycine Nitrate Process (GNP). Nano sized powders were synthesized by GNP and their chemical compositions were confirmed by ICP analysis. The electrical conductivities of LSCCCu, LSCCNi, and LSCCV samples were 34 S/cm, 48 S/cm, and 22 S/cm at 800 • C in air, respectively. Among the LSCCB powders, the LSCCNi sample shows highest relative density and electrical conductivity. In a low oxygen partial pressure, however, LSCCV sample was more stable. The perovskite phase of the composition LSCCV sample is of large practical interest for interconnects in SOFC because of the stability in low oxygen partial pressure.

The electrical modulus and other dielectric properties by the impedance spectroscopy of LaCrO3and LaCr0.90Ir0.10O3perovskites

“… 35–38 The doped transition metal type has significant impact on the LCO properties because it changes almost all LCO parameter including physical and chemical. Many doping studies have been conducted on the LCO with various transition metals including Sr, 39 Co, 40 Ni, 41 V, 41 Cu, 41 Mn, 42 Ca, 43 Pd 44 etc.…”

Thermodynamic Assessment of the La-Cr-O System

“…Diffusion of chromium from the metallic interconnect with high chromium content into the cathode leads to the formation of Mn(Cr,Mn) 2 O 4 spinel and Cr 2 O 3 along with a severe cell voltage decrease. [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.…”

Study of Electrochemical and Crystallographic Changes During Initial Stabilization of La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3−δ Reversible Solid Oxide Cell Electrode

“…LaCrO 3− δ ‐based materials have excellent stability in both oxidizing and reducing atmosphere and are, thus, promising RSOC interconnect materials 13, 14. The same LaCrO 3− δ based materials could, in principle, also be used as a solid oxide cell (SOC) electrodes, but the polarization resistance is usually too high.…”