Preparation and Performance of Anode-supported LaGaO3-based Electrolyte Solid Oxide Fuel Cells with Sm-doped CeO2 Buffer Layers

doi:10.3724/SP.J.1077.2011.00685

Abstract

Abstract: Anode-supported solid oxide fuel cells (SOFCs) composed of NiO-SDC (Sm_0.2Ce_0.8O_1.9) composite anode, thin tri-layer electrolyte, and La_0.6Sr_0.4Co_0.8Fe_0.2O₃ (LSCF)-La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ (LSGM) composite cathode were fabricated. The thin 11μmSDC/15μmLSGM/13μmSDC tri-layer electrolyte was prepared by centrifugal casting and co-firing technique. Cell tests in air as oxidant and humidified hydrogen as fuel show a maximum power density of 0.92W/cm² at 800℃. However, the open-circuit voltage (OCV) of these cells is 0.89V which is lower than the Nernst potential. The above result is due to electronic conductivity in the LSGM layer, resulting from Ni impurities that entered during co-firing with the NiO-SDC anode. While the SDC buffer layers are introduced as buffer layers, impedance measurements indicate that both the ohmic resistance and the polarization resistance dominate the cell performance.

Key words: solid oxide fuel cells, La_0.9Sr_0.1Ga_0.8Mg_0.2O_3-δ, Sm_0.2Ce_0.8O_1.9, performance

CLC Number:

O642
TM911

GUO Wei-Min, PEI Jun-Yan, LIANG Hong-Yu, LIU Jiang. Preparation and Performance of Anode-supported LaGaO₃-based Electrolyte Solid Oxide Fuel Cells with Sm-doped CeO₂ Buffer Layers[J]. Journal of Inorganic Materials, 2011, 26(7): 685-690.

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Preparation and Performance of Anode-supported LaGaO₃-based Electrolyte Solid Oxide Fuel Cells with Sm-doped CeO₂ Buffer Layers

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