Stability of Sc2O3 and CeO2 co-doped ZrO2 Electrolyte during the Operation of Solid Oxide Fuel Cells

被引：28

作者：

Shimazu, Megumi ^{[1
,2
]}

Isobe, Toshihiro ^{[2
]}

Ando, Shigeru ^{[1
]}

Hiwatashi, Ken-ichi ^{[1
]}

Ueno, Akira ^{[1
]}

Yamaji, Katsuhiko ^{[3
]}

Kishimoto, Haruo ^{[3
]}

Yokokawa, Harumi ^{[3
]}

Nakajima, Akira ^{[2
]}

Okada, Kiyoshi ^{[2
,4
]}

机构：

[1] TOTO LTD, Fuel Cell Div, Kanagawa 2538577, Japan

[2] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528550, Japan

[3] Natl Inst Adv Ind Sci & Technol, Fuel Cell Mat Grp, Tsukuba, Ibaraki 3058565, Japan

[4] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

SOLID STATE IONICS | 2011年 / 182卷 / 01期

关键词：

Sc2O3 doped ZrO2; Stabilized zirconia; Phase transformation; Solid oxide fuel cell; ELECTRICAL-CONDUCTIVITY; ZIRCONIA ELECTROLYTE; IONIC-CONDUCTIVITY; RAMAN-SCATTERING; PHASE-TRANSITION; STRUCTURAL EVOLUTION; CUBIC-ZIRCONIA; SCANDIA; SYSTEM; DEGRADATION;

D O I：

10.1016/j.ssi.2010.08.030

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The phase stability of 10 mol% Sc2O3 and 1 mol% CeO2 co-doped ZrO2 (10Sc1CeSZ) electrolyte during long term operation of a cathode-supported tubular-type SOFC was investigated. The surface of the cubic (c) phase of 10Sc1CeSZ electrolyte transformed to the monoclinic (m) phase via the tetragonal (t) phase during operation at 900 degrees C for 100 h. This phase transformation was facilitated by increasing the steam concentration in the inlet fuel from 3.0 to 28.5 vol.%. The amount of transformed t- and m-phases increased at longer operation times. High concentration of steam in the fuel, impurities such Mn, Al and Si in the electrolyte and the electrochemical potential gradient of oxide ion on the electrolyte surface, are thought to destabilize the c-phase. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：120 / 126

页数：7

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