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NaCl对BaZr_(0.63)Ce_(0.27)Y_(0.10)O_(2.95)/ZnO质子导体的烧结性与电化学性能的影响 被引量:2

Effect of NaCl on Sinterability and Electrochemical Performance of BaZr_(0.63)Ce_(0.27)Y_(0.10)O_(2.95)/ZnO Protonic Conductors
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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BaZr063Ce0.27Y0.10O2.95的质子导体(BZCY-Z2)中添加0~15%(摩尔分数)NaCl,在1400℃保温4h,制备BaZr0.63Ceo-27Y0100295/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7.48×100S/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17mW/cm2,由于电解层厚度较厚(0.9nm),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 BaZr0.63Ce0.27Y0.1002.95/ZnO/NaC1 (BZCY-Z2-C1) proton conductors with the heterogeneous structure were synthe- sized with NaC1 of 5%, 10% and 15% (in mole fraction) to ZnO of 2% doped BaZr0.63Ceo.27Yo.1002.95 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 NaC1 added as a sintering aid. Therefore, the sintering properties of the BZCY-Z2-C1 proton conductor are improved by the addition of NaC1. NaC1 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 protouic conductor reaches 7.48 x 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.
出处 《硅酸盐学报》 EI CAS CSCD 北大核心 2013年第10期1421-1425,共5页 Journal of The Chinese Ceramic Society
基金 贵州省省校科技合作计划项目([2011]7002)
关键词 锆酸钡 铈酸钡 氯化钠 复相质子导体 电导率 barium zirconate barium cerate sodium chloride protonic conduction composites conductivity
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