Optimum cathode configuration for IT-SOFC using La0.4Ba0.6CoO3Ld and Ce0.9Gd0.1O1.95

C. MARTINEZ SETEVICH; L. MOGNI; A. CANEIRO; F. PRADO

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2012

0360-3199

Three different cathode configurations using porous layers of La0.4Ba0.6CoO3
d (LBC),LBCeGDC composite in a 50:50 weight ratio, and GDC were prepared and measured byimpedance spectroscopy on symmetrical cells. These three cathode configurations were: A)porous GDC þ LBC, B) porous GDC þ LBCLGDC composite, and C) porous GDC þ LBCeGDCcomposite þ LBC. The minimum polarization resistance (Rp) value was obtained withconfiguration C. The incorporation of both the porous GDC layer and the intermediate layerof LBCeGDC composite, allowed us to solve adherence problems caused by the totalexpansion mismatch between LBC (26$10
6 K
1) and GDC (12$10
6 K
1). The Rp valuesobtained with cell C are comparable to the performance of another cell C prepared withBa0.5Sr0.5Co0.8Fe0.2O3
d (BSCF). For example, the Rp values at 600 C, in air, were 0.071 and0.065 Ucm2 for LBC and BSCF, respectively. These results suggest that configuration C isvery promising for developing IT-SOFC cathode with low Rp values.