硅酸盐学报

NaCl对BaZr0.63Ce0.27Y0.10O2.95/ZnO质子导体的烧结性与电化学性能的影响

作者：徐江海1 江虹2 郭瑞松3 张立欣3

单位：1. 贵州大学化学与化工学院贵阳 550025 2. 贵州广播电视大学贵阳 550004 3. 天津大学材料学院天津 300072

关键词：锆酸钡铈酸钡氯化钠复相质子导体电导率

分类号：

出版年,卷(期):页码：2013,41(10):1421-1425

DOI：

摘要：

采用机械混合和高温固相反应法，在2% (摩尔分数) ZnO掺杂BaZr0.63Ce0.27Y0.10O2.95的质子导体(BZCY-Z2)中添加0～15%(摩尔分数) NaCl，在1 400 ℃保温4 h，制备BaZr0.63Ce0.27Y0.10O2.95/ZnO/NaCl(BZCY-Z2-Cl)复相质子导体。结果显示，加入NaCl作为复相烧结助剂后，由于出现液相，降低了试样的烧结温度与保温时间，从而改善了试样的烧结性能；NaCl均匀分布于晶界，改善了晶界特性，提高了晶界质子导电性，质子导体于700 ℃时在湿氢气氛中总电导率达7.48 × 10–3 S/cm；电解质支撑型单元电池测试结果表明，单电池在550、600、650和700 ℃下离子传导系数分别达到0.97、0.97、0.95和0.93，表明该电解层材料为良好的质子导体；700 ℃时功率密度为17 mW/cm2，由于电解层厚度较厚(0.9 nm)，导致输出功率相对较低。上述结果表明所制备的质子导体材料具有良好的电化学性能。

The BaZr0.63Ce0.27Y0.10O2.95/ZnO/NaCl (BZCY-Z2-Cl) proton conductors with the heterogeneous structure were synthesized with NaCl of 5%, 10% and 15% (in mole fraction) to ZnO of 2% doped BaZr0.63Ce0.27Y0.10O2.95 proton conductors (i.e., BZCY-Z2) through a mechanical-mixing process and sintering at 1 400 ℃ for 4 h. The results show that the sintering temperature and soaking time can be reduced due to the presence of liquid phase after the addition of NaCl added as a sintering aid. Therefore, the sintering properties of the BZCY-Z2-Cl proton conductor are improved by the addition of NaCl. NaCl is homogeneously distributed on the grain boundary, changing the characteristics of grain boundary. As a result, the protonic conduction along the grain boundary is enhanced. The total conductivity of the protonic conductor reaches 7.48 × 10–3 S/cm at 700 ℃ in wet hydrogen. The experimental results of a single fuel cell with electrolyte-supported configuration reveal that the ionic transport number is 0.97, 0.97, 0.95 and 0.93 at 550, 600, 650 and 700 ℃, respectively, revealing that it is a superior protonic conductor. It also deliveries a maximum output power density of 17 mW/cm2 at 700 ℃. The lower output power density is due to a thick electrolyte (0.9 mm in thickness). These indicate that the superior electrochemical performance of the NaCl-modified protonic conductor could be obtained.

基金项目：

贵州省省校科技合作计划项目([2011]7002)。

作者简介：

参考文献：

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