A new electrolyte based on Tm3+-doped δ-Bi2O3-type phase with enhanced conductivity

被引：31
作者：
Dapcevic, A. [1 ]
Poleti, D. [1 ]
Rogan, J. [1 ]
Radojkovic, A. [2 ]
Radovic, M. [3 ]
Brankovic, G. [2 ]
机构：
[1] Univ Belgrade, Dept Gen & Inorgan Chem, Fac Technol & Met, Belgrade 11000, Serbia
[2] Univ Belgrade, Inst Multidisciplinary Res, Belgrade 11000, Serbia
[3] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA
来源：
SOLID STATE IONICS | 2015年 / 280卷
基金：
美国国家科学基金会;
关键词：
Solid oxide fuel cell; Electrolyte; Oxide ion conductor; Stability; delta-Bi2O3-type phase; CUBIC BISMUTH OXIDES; ION CONDUCTORS; FUEL-CELLS; ELECTRICAL-CONDUCTIVITY; PHYSICAL-PROPERTIES; SOLID-SOLUTIONS; SYSTEM; BI2O3; SESQUIOXIDE; STABILITY;
D O I：
10.1016/j.ssi.2015.08.004
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 possibility to stabilize the delta-Bi2O3-type polymorph with high ionic conductivity by doping with Tm2O3 was investigated in this study. Five microaystalline samples were synthesized at 750 degrees C from alpha-Bi2O3 and Tm2O3 mixtures with compositions (Bi1-xTmx)(2)O-3, where x = 0.04, 0.08, 0.11, 0.14 and 0.20. The XRD, SEM, HRTEM and SAED results showed that the targeted delta-Bi2O3-type single-phase (space group Fm (3) over barm) was formed for 0.11 <= x <= 0.20. The unit cell parameter of delta-Bi2O3-type phase decreases with increase in Tm content. According to DTA, no phase transitions were observed in the sample with x = 020, indicating that the obtained delta-Bi2O3-type phase is structurally stable from room temperature to 985 degrees C. Based on EIS, (Bi0.80Tm0.20)(2)O-3 exhibits high conductivity (0.117 S cm(-1) at 550 degrees C) with activation energies: 0.38(4) eV above 550 degrees C and 127(2) eV below 550 degrees C, due to the change in charge carrier mobility. The effect of thermal aging was investigated and discussed. (C) 2015 Elsevier B.V. All rights reserved.
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页码：18 / 23
页数：6
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