Electrochemical Properties of La0.8Sr (0.2)Ga0.8Mg0.2O2.8 Electrolyte and Its Application to SOFCs

Abstract

Abstract: Sr- and Mg-doped LaGaO₃(La_0.8Sr_0.2Ga_0.8Mg_0.2O_2.8) powders have been successfully synthesized from carbonate and oxides based on the principle of gelcasting. XRD patterns indicate the perovskite structure is formed without any second phases after sintering the powders at 1 400 ℃ for 6 h. The pellet sample was sintered to 98.3% of theoretical density at 1 450 ℃ for 18 h. The total electrical conductivity was greatly depended on the sintering time, and reached the maximum when the pellet was sintered at 1 450 ℃ for 24 h. Planar SOFC was constructed using Ni-Ce_0.8Gd_0.2O_1.9 and La_0.8Sr_0.2Ga_0.6Ni_0.4O_2.7 as the anode and cathode, respectively. When humidified hydrogen and air were introduced to the two electrodes, maximum power density of 252 mW/cm²(U=0.48 V, J=525 mA/cm²) was achieved with the open circuit voltage of 1.04 V at 750 ℃.

Key words: La_0.8Sr_0.2Ga_0.8Mg_0.2O_2.8, Solid electrolyte, Gelcasting, Solid oxide fuel cells

CLC Number:

TM911

TrendMD:

ZHA Shao-Wu, LI Hai-Bin, XIA Chang-Rong, LIU Xing-Qin, MENG Guang-Yao . Electrochemical Properties of La_0.8Sr(0.2)Ga_0.8Mg_0.2O_2.8 Electrolyte and Its Application to SOFCs[J]. Chem. J. Chinese Universities, 2003, 24(3): 506.

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Electrochemical Properties of La_0.8Sr(0.2)Ga_0.8Mg_0.2O_2.8 Electrolyte and Its Application to SOFCs

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