Symmetric Electrodes for Solid Fuel Cells Based on Sr-Doped LaFe_0.7Ni_0.3O_3-δ

Abstract:

Perovskite La_1-xSr_xFe_0.7Ni_0.3O_3-δ with x = 0.0, 0.1 &0.2 denoted LSFN_x has been investigated as potential symmetrical electrode in solid fuel cells (SOFCs). The crystal structure is in pure orthorhombic phase for x = 0.0, orthorhombic-cubic phase coexist for x = 0.1 and pure cubic phase for x = 0.2. Structural properties are studied by X-ray powder diffraction (XRPD), refined by Rietveld analysis. SEM images show the morphology of as prepared and calcined samples either the compatibility between those electrodes and LSGM electrolyte in presence of 50% wt of Ce_0.8Gd_0.2O_2-δ, so that, lower chemical reactivity was found. Total conductivity, impedance in high, medium and low frequencies HF, MF and LF respectively, and resistance polarization (Rp) are determined in air. LaFe_0.7Ni_0.3O_3-δ has a good response in all ranges of frequencies but La_0.9Sr_0.1Fe_0.7Ni_0.3O_3-δ and La_0.8Sr_0.2Fe_0.7Ni_0.3O_3-δ have response only in HF and MF and exhibit Rp values as low as LaFe_0.7Ni_0.3O_3-δ .

• Periodical: Materials Science Forum (Volume 887)
• Pages: 24-31
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.887.24
• Online since: March 2017
• Authors: Omar Ben Mya, Mahmoud Omari, Lucia dos Santos-Gomez, David Marerro-Lopezd
• Keywords: Anode, Cathode, LaFe_0.7Ni_0.3O_3-δ, SOFC, Sr-Doped, Symmetric Electrodes

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