Preparation and Properties of Cobalt-Doped Ceria (CDC) for IT-SOFCs Anodes in Natural Gas

doi:10.3724/sp.j.1077.2009.00539

Abstract

Abstract: Ce1_-xCo_xO_y（x＝0.10, 0.15, 0.20, 0.25, 0.30）(CDC) powders as the anode materials of intermediate temperature solid oxide fuel cells (IT-SOFCs) were prepared by sol-gel method. The NiO-CDC anodesupported cells were fabricated by drypressing process using Ce_0.8Gd_0.2O_2-_δ(GDC) as electrolyte and La_0.8Sr_0.2Co_0.8Fe_0.2O_3-δ(LSCF)-Ce_0.8Gd_0.2O_2-δ(GDC) as cathode. The crystal structure, morphology and chemical stability were investigated by XRD and SEM respectively. The performances of single cells were tested by using humidified natural gas(3% H₂O) as fuel and oxygen as oxidant in the temperature range from 400℃ to 700℃. The results show that the anode of the cell has good openframework; The 50％NiO-50%Ce_0.8Co_0.2O_y（C20C80）anodesupported cell shows the best electrochemical performance among the eight cells composed of different anodes. The maximum current density and power density are 148.84mA/cm² and 30.91mW/cm² tested at 650℃, respectively.

Key words: IT-SOFCs, transition metal, cobaltdoped-ceria, electrical conductivity

CLC Number:

TM911

HAO Hong-Xia,LIU Rui-Quan. Preparation and Properties of Cobalt-Doped Ceria (CDC) for IT-SOFCs Anodes in Natural Gas[J]. Journal of Inorganic Materials, DOI: 10.3724/sp.j.1077.2009.00539.

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