A Study of PrGa1-xMgxO3 as the Electrolytes of SOFCs

Abstract

Abstract: PrGa_1-x Mg_x O₃( x=0, 0.05, 0.10, 0.15, 0.20, 0.25) were synthesized by using a standard solid state technology. XRDresults show that all samples are orthorhombic. Mg-doping increases the oxygen ion conductivity and decreases the activation energy of the samples significantly. The conductivity of the samples is mainly ionic. PrGa_0.9 Mg_0.1 O₃ has the highest conductivity of 0.05 S/cm at 800 ℃, while PrGa_0.8 Mg_0.2 O₃ has the lowest activation energy of 24.19 kJ/moLIn all the samples. The oxygen ion transport number of the samples increases with increasing temperature. SOFCs results show that PrGa_0.9 Mg_0.1 O₃ has the best properties, for which the power density of 0.131 W/cm² and the short circuit current density of 0.45 A/cm² were achieved at 940 ℃. This study reveals that Mg doped PrGaO₃ is a kind of solid electrolyte with superior properties.

Key words: PrGaO₃, Solid electrolyte, Oxygen ion conductivity, Solid oxide fuel cell

CLC Number:

O614.33

TrendMD:

LIU Zhi-Guo, HUANG Xi-Qiang, LIU Wei, Lü Zhe-JI, Yuan-PEI Li, HE Tian-Min, SU Wen-Hui . A Study of PrGa_1-xMg_xO₃ as the Electrolytes of SOFCs[J]. Chem. J. Chinese Universities, 2001, 22(8): 1283.

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A Study of PrGa_1-xMg_xO₃ as the Electrolytes of SOFCs

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