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Preparation of an Alkali‐Element‐Doped CeO 2 ‐Sm 2 O 3 System and Its Operation Properties as the Electrolyte in Planar Solid Oxide Fuel Cells
Author(s) -
Mori Toshiyuki,
Yamamura Hiroshi,
Saito Syoshichi
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08110.x
Subject(s) - alkali metal , materials science , ionic conductivity , electrolyte , solid oxide fuel cell , oxide , inorganic chemistry , ceramic , fast ion conductor , doping , conductivity , cubic zirconia , electrochemistry , yttria stabilized zirconia , solid solution , chemical engineering , analytical chemistry (journal) , chemistry , electrode , metallurgy , optoelectronics , organic chemistry , engineering , chromatography
The ionic conductivity of the ceria‐samaria (CeO 2 ‐Sm 2 O 3 ) system is higher than that of yttria‐stabilized zirconia and other CeO 2 ‐based oxides. In this study, a small amount of alkali‐element‐doped CeO 2 ‐Sm 2 O 3 solid solution was prepared. This solid solution was characterized by measuring the powder density and the chemical composition. Moreover, its electrochemical properties were investigated in the temperature range from 700° to 1000°C. It was found that a small amount of alkali‐element‐doped CeO 2 solid solution enhanced the ionic conductivity. The power density of an oxygen‐hydrogen fuel cell for alkali‐element‐doped CeO 2 ‐Sm 2 O 3 ceramics exhibited high values at low temperatures such as 700° to 800°C. It is concluded that the improved fuel cell performance can be attributed to the high stability of this composition in the fuel atmosphere.