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采用固相法合成了钙钛矿型氧化物La_(0.4)Sr_(0.6)Co_(0.2)Fe_(0.7)Nb_(0.1)O_(3-δ)(LSCFN),并采用流延-丝印法制备了以8 mol%Y_2O_3稳定Zr O_2(YSZ)为电解质、Gd_(0.1)Ce_(0.9)O_(2-δ)(GDC)为隔离层、LSCFN同时为阴极和阳极的对称固体氧化物燃料电池。利用X射线衍射对电极材料进行了物相及化学相容性分析,用扫描电镜表征了对称电池的微观形貌。分别以湿H_2(3%H_2O)和湿CH_4(3%H_2O)为燃料气,空气为氧化气测试了单电池的电化学性能,并在850℃湿CH_4下进行了电池的稳定性测试。结果表明:LSCFN与GDC具有良好的化学相容性。以湿H_2和湿CH_4为燃料气的单电池在850℃时最大功率密度分别为254和105 m W/cm~2。在100 h的CH_4稳定性测试中性能无明显衰减,具有良好的稳定性。
The La_ (0.4) Sr_ (0.6) Co_ (0.2) Fe_ (0.7) Nb_ (0.1) O_ (3-δ) (LSCFN) perovskite oxide was synthesized by solid- A symmetric solid oxide fuel cell with 8 mol% Y_2O_3 stabilized ZrO_2 (YSZ) as electrolyte and Gd_ (0.1) Ce_ (0.9) O_ (2-δ) GDC as isolation layer and LSCFN as cathode and anode was prepared. The phase and chemical compatibility of the electrode materials were analyzed by X-ray diffraction. The morphology of the symmetric battery was characterized by scanning electron microscopy. The electrochemical performance of the single cell was tested with wet H 2 (3% H 2 O) and wet CH 4 (3% H 2 O) as the fuel gas and air as the oxidizing gas. The stability of the cell was tested at 850 ℃ in wet CH 4. The results show that LSCFN and GDC have good chemical compatibility. The maximum power densities of cells with wet H 2 and wet CH 4 as fuel gas were 254 and 105 mW / cm 2 at 850 ℃, respectively. In the 100 h CH_4 stability test performance no significant attenuation, with good stability.