Hydrothermal synthesis and electrical characterization of (Ce{sub 0.83}Sm{sub 0.17}){sub 1{minus}x}Ln{sub x}O{sub 2{minus}{delta}} (Ln = Pr, Tb) as potential electrolyte materials for solid oxide fuel cells

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1393215· OSTI ID:20023331

Huang, W; Shuk, P; Greenblatt, M

(Ce{sub 0.83}Sm{sub 0.17}){sub 1{minus}x}Ln{sub x}O{sub 2{minus}{delta}} (Ln = Pr, Tb, 0 {le} x {le} 0.1) solid electrolytes were prepared by a soft hydrothermal method at 260 C. Transmission electron microscopy (TEM) and X-ray diffraction were used to clarify the structure and morphologies of the crystalline powers. The average crystallite size observed in the TEM is in the range of 10--60 nm, close to those calculated by the Scherrer formula from X-ray patterns. The uniformly small particle size of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramic pellets at 1,300--1,400 C, a significantly lower temperature, compared to that of 1,600--1,650 C required for samples prepared by solid-state techniques. The variation of the electrical conductivity with the partial pressure of oxygen, Po{sub 2}, in the range 0.21 to 10{sup {minus}24} atm at various temperatures was used to determine the electrolytic domain boundary (EDB) of (Ce{sub 0.83}Sm{sub 0.17}){sub 1{minus}x}(Tb/Pr){sub x}O{sub 2{minus}{delta}} for 0 {le} x {le} 0.1. The EDB of Ce{sub 0.83}Sm{sub 0.17}O{sub 2{minus}{delta}} is {approximately}10{sup {minus}18} atm at 700 C. It is shown that neither Pr nor Tb doping has a significant effect on the EDB of Ce{sub 0.83}Sm{sub 0.17}O{sub 2{minus}{delta}}.

• Research Organization: Rutgers, The State Univ. of New Jersey, Piscataway, NJ (US)
• OSTI ID: 20023331
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 147; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
CERIUM OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HYDROTHERMAL SYNTHESIS
PRASEODYMIUM OXIDES
SAMARIUM OXIDES
SOLID ELECTROLYTES
SOLID OXIDE FUEL CELLS
TERBIUM OXIDES