中文摘要：

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La0．8Sr0．2Ga0．8Mg0．203（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、Ce08Gd0．202m（GDC）在1250℃煅烧10h，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，LaxSr2-xMgMoO6-δ的电导率为40S／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。

英文摘要：

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 de 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.EGa0.8Mg0.2O3（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%Ha/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.