Authors: JongEun Hong Toru Inagaki Tatsumi Ishihara
Publish Date: 2012/03/01
Volume: 18, Issue: 5, Pages: 433-439
Abstract
Ladoped ceria Ce06La04O18 LDC has been reported to be an effective buffer layer material for preventing the chemical reaction between Sr and Mgdoped LaGaO3 LSGM electrolyte and Nibased anode during sintering However it seems difficult to achieve a high power density on the cell using LDC buffer layer because of its low sintering and electrical conducting properties In this study effects of various sintering additives such as MgO SrO In2O3 Ga2O3 ZrO2 and LSGM oxide powders were studied for improving sintering density and electrical conductivity of LDC Sintering property phase formation and electrical conductivity varied with the sintering agents Addition of SrO Ga2O3 or LSGM enhanced the sintering density of LDC while LSGM addition was effective to increase the electrical conductivity LSGM sintering aid was inert with LDC accompanying no chemical reaction after sintering at 1623 K Therefore it was considered that a small amount of LSGM addition as a sintering agent was desirable for improving sintering and electrical properties of LDC Furthermore a single cell using LSGMadded LDC buffer layer and LSGM electrolyte film was fabricated by a screen printing method after cofiring at 1623 K The obtained cell showed an almost theoretical open circuit voltage and a high maximum power density 0725 W cm−2 at 973 K
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