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新型固体氧化物燃料电池阳极材料LaxSr2–xMgMoO6–δ的结构与电化学性能
作者:谢志翔1 2 陈婷1 赵海雷2 杜志鸿2 李月明1 
单位:1. 景德镇陶瓷学院材料学院 江西 景德镇 333001 2. 北京科技大学材料学院 北京 100083 
关键词:固体氧化物燃料电池 阳极 电导率 阻抗 功率密度 
分类号:TM911.4
出版年,卷(期):页码:2016,44(6):817-823
DOI:10.14062/j.issn.0454-5648.2016.06.06
摘要:
通过柠檬酸络合法合成了LaxSr2–xMgMoO6–δ (LSMM)阳极材料。利用X射线衍射和扫描电子显微镜分析样品的物相结构、微观形貌及与电解质的化学相容性,采用四端引线法测试材料的电导率,利用电化学工作站测试其阳极阻抗特性,并以La0.8Sr0.2Ga0.8Mg0.2O3(LSGM)为电解质、PrBaCo2O5+δ为阴极制备了单电池,测试功率密度。结果表明:空气中La的掺杂量小于0.2(摩尔分数)时,还原后La的掺杂量可以达到0.6,La的掺杂导致晶胞体积增大。La掺杂的Sr2MgMoO6(SMMO)与电解质LSGM、Ce0.8Gd0.2O2–δ(GDC)在1 250 ℃煅烧10 h,均没有杂质相生成,具有良好的化学相容性。La掺杂显著提高了SMMO的电导率,800 ℃、5%H2/Ar气氛中,La0.6Sr1.4MgMoO6–δ的电导率为40 S/cm。La的掺杂降低了阳极材料的极化电阻,提高了电池功率密度。
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LaxSr2–xMgMoO6–δ (LSMM) anode material was synthesized via a citrate acid complexing method. The phase composition was determined by X-ray diffraction, and the microstructure of the sintered samples was determined by scanning electron microscopy. The electrical conductivity of all samples was measured by a standard four-terminal dc method, and the AC electrochemical impedance spectra were detected in a symmetrical cell. Single fuel cells were prepared using an electrolyte-supported technique with La0.8Sr0.2Ga0.8Mg0.2O3(LSGM) as an electrolyte, LSMM as an anode and PrBaCo2O5+δ as a cathode. The results demonstrate that the doping limit of La is less than 0.2 in air, which is 0.6 after reducing in 5%H2/Ar. The doping leads to the increase of cell volume of LSMM. The LSMM anode material has a good chemical compatibility with GDC and LSGM electrolytes after calcining at 1 250 ℃ for 10 h. The La doping increases the electronic conductivity of La0.6Sr1.4MgMoO6–δ, which is 40 S/cm at 800 ℃ in 5%H2/Ar, and decreases the polarization resistance, resulting in the improvement of power density for single cells.
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基金项目:
国家自然科学基金(51402136, 51402135)和江西省自然科学基金(20142BAB216007, 20142BAB216006)资助。
作者简介:
谢志翔(1982—),男,博士,讲师。
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参考文献:
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