Hydrothermal Synthesis and Electrical Characterization of (Ce[sub 0.83]Sm[sub 0.17])[sub 1−x]Ln[sub x]O[sub 2−δ] (Ln = Pr, Tb) as Potential Electrolyte Materials for Solid Oxide Fuel Cells

Publisher Website
Google Scholar
Abstract
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 the 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 1300–1400°C, a significantly lower temperature, compared to that of 1600–1650°C required for samples prepared by solid‐state techniques. The variation of the electrical conductivity with the partial pressure of oxygen, , in the range 0.21 to atm at various temperatures was used to determine the electrolytic domain boundary (EDB) of for 0 ≤ ≤ 0.1. The EDB of is at 700°C. It is shown that neither Pr nor Tb doping has a significant effect on the EDB of . © 2000 The Electrochemical Society. All rights reserved.

This publication has 0 references indexed in Scilit: