C. Tian, Minzheng Zhu, Lingbo Shao, Xiaoling Qu, Lejie Zhu, Chao Chen, Caoli Wang, Yang Liu
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引用次数: 1
摘要
标称配方为La1.75Y0.25Mo2-xAlxO9-?的钼酸镧陶瓷上钇铝共取代(LYMA, x = 0, 0.1, 0.2, 0.3和0.4))采用柠檬酸-硝酸盐燃烧法合成,用于制备中温固体氧化物燃料电池(itsofc)的固体电解质。利用x射线衍射、扫描电镜和电化学阻抗谱分别研究了LYMA的相组成、结构、电导率和电性能与铝含量的关系。实验结果表明,用适量的Y和Al取代La和Mo可以在室温下有效地稳定La2Mo2O9的?-形态,抑制其向?-形态的相变。燃烧法合成的LYMA具有较好的烧结性能,烧结样品的相对密度为950?4 h C高于95%TD。LYMA电解液的性能与al含量有关。La1.75Y0.25Mo1.8Al0.2O8.7具有较高的氧化离子电导率(?= 42mS/cm(800℃),电活化能低(Ea = 1.18 eV)。这些初步结果表明,LYMA是一种很有前途的it - sofc电解质。
Preparation and characterization of La1.75Y0.25Mo2-xAlxO9-δ as solid electrolyte for intermediate temperatures SOFC
Yttrium and aluminium co-substitutions on lanthanum molybdate ceramics with the nominal formula La1.75Y0.25Mo2-xAlxO9-?? (LYMA, x = 0, 0.1, 0.2, 0.3 and 0.4) were synthesized by citric acid-nitrate combustion method and used for preparation of solid electrolyte for intermediate-temperature solid oxide fuel cells (ITSOFCs). Phase composition, structure, conductivity and electrical properties of LYMA have been investigated as a function of aluminium content by X-ray diffraction, scanning electron microscopy and electrochemical impedance spectroscopy, respectively. Experimental results showed that the substitution of La and Mo with appropriate amounts of Y and Al can effectively stabilize the ?-form of La2Mo2O9 at room temperature and inhibit its phase transition to ?-form. The LYMA synthesized by combustion method exhibited a better sinterability where relative density of the samples sintered at 950?C for 4 h was higher than 95%TD. The performance of the LYMA electrolyte was found to be related to Al-content. The La1.75Y0.25Mo1.8Al0.2O8.7 exhibited high oxide ion conductivity (?= 42mS/cm at 800?C) and low electrical activation energy (Ea = 1.18 eV). These preliminary results indicate that the LYMA is a promising electrolyte for IT-SOFCs.