Investigation of ionic conductivities of CeO2-based electrolytes with controlled oxygen vacancies

被引：5

作者：

Chou, Chen-Chia ^{[1
]}

Huang, Chun-Feng ^{[1
]}

Yeh, Tsung-Her ^{[2
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, Adv Ceram Lab, Taipei, Taiwan

[2] Ming Chi Univ Technol, Ctr Thin Film Technol & Applicat, New Taipei City, Taiwan

来源：

CERAMICS INTERNATIONAL | 2013年 / 39卷

关键词：

C. Ionic conductivity; D; CeO2; C; Impedance; B. Grain size; LATTICE-PARAMETERS; DOPED CERIA;

D O I：

10.1016/j.ceramint.2012.10.150

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Effects of Gd2O3 and SrO co-dopants on microstructural features, ionic conductivities and oxygen vacancy concentrations of two modified CeO2 electrolytes (Ce0.8Gd(0.2-x)Sr(x)O(1.9-0.5)x, and Ce0.8-xGd0.2SrxO1.9-x) are investigated using X-ray diffractometry (XRD), scanning electron microscopy (SEM) and AC impedance spectroscopy. Lattice parameters of co-doped CeO2 specimens are observed to linearly increase with an increase of co-dopants amount, due to larger radius of Sr2+. Grain size of Ce0.8-xGd0.2Sr(x)O(1.9-x) ,Gd0.2SrxO1.9 is significantly larger than that of Ce0.8Gd0.2SrO1.9-0.5x at the same Sr2+ concentration, because Ce0.8-xGd0.2Srx1.9-x, posseises more oxygen vacancy to migrate oxygen ions, defects and impurities easily, based upon calculation of oxygen vacancy amount. Small addition of SrO into 20 mol% Gd2O3 doped CeO2 (Ce0.8-xGd0.2SrxO1.9-x) is effective in enhancing of ionic conductivity, but a sudden decreasing of conductivity with Sr2+ heavy-doping is found. The relationship among co-dopant concentration, oxygen vacancy radius, average binding energy and ionic conductivity in two different co-doped CeO2 systems are discussed in this work. (C) 2013 Published by Elsevier Ltd and Techna Group S.r.l.

引用

页码：S627 / S631

页数：5

共 8 条

[1] Electrocatalysts for fuel cells [J].

Acres, GJK ;

Frost, JC ;

Hards, GA ;

Potter, RJ ;

Ralph, TR ;

Thompsett, D ;

Burstein, GT ;

Hutchings, GJ .

CATALYSIS TODAY, 1997, 38 (04) :393-400

[2]

David R.L., 1992, CRC HDB CHEM PHYS

[3] LATTICE-PARAMETERS AND DENSITIES OF RARE-EARTH-OXIDE DOPED CERIA ELECTROLYTES [J].

HONG, SJ ;

VIRKAR, AV .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1995, 78 (02) :433-439

[4] LATTICE-PARAMETERS, IONIC CONDUCTIVITIES, AND SOLUBILITY LIMITS IN FLUORITE-STRUCTURE HF-4+O2, ZR-4+O2, CE-4+O2, TH-4+O2, V-4+O2 OXIDE SOLID-SOLUTIONS [J].

KIM, DJ .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1989, 72 (08) :1415-1421

[5] Elasticity of solids with a large concentration of point defects II.: The chemical strain effect in Ce0.8Gd0.2O1.9 [J].

Kossoy, Anna ;

Feldman, Yishay ;

Wachtel, Ellen ;

Lubomirsky, Igor ;

Maier, Joachim .

ADVANCED FUNCTIONAL MATERIALS, 2007, 17 (14) :2393-2398

[6] Electronic conductivity of Gd-doped ceria with additional Pr-doping [J].

Lübke, S ;

Wiemhöfer, HD .

SOLID STATE IONICS, 1999, 117 (3-4) :229-243

[7] Catalytic properties of ceria and CeO2-containing materials [J].

Trovarelli, A .

CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1996, 38 (04) :439-520

[8] Lanthanide co-doping of solid electrolytes: AC conductivity behaviour [J].

van Herle, J ;

Seneviratne, D ;

McEvoy, AJ .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 1999, 19 (6-7) :837-841

← 1 →