High Performance Fuel Cells Based on LaGaO
Acta Phys. -Chim. Sin.
2004, 20 (01):
High performance intermediate temperature solid oxide fuel cells(ITSOFC) based on LaGaO3 electrolytes were constructed, and the electrochemical properties of the cells were studied in detail. Ni-15％ (mole fraction x) Sm3＋ doped CeO2 (Ni-SDC) anode and Sm0.5Sr0.5CoO3 (SSC) cathode were prepared with the impregnation method, and La0.8Sr0.2Ga0.8Mg0.2－xCoxO3 (LSGMC, x=0, 0.01, 0.05, 0.07, 0.09)electrolytes were prepared with solid state reaction. The performance of the cell was improved significantly using LSGMC due to the decrease of ohmic resistance of the cell and the electrode over-potential. The maximum power densities of Ni-SDC/ La0.8Sr0.2Ga0.8Mg0.11Co0.09O3/SSC at 1073, 973, 873 K reached 1.77, 0.92, and 0.41 W•cm-2, respectively. The addition of cobalt into La0.8Sr0.2Ga0.8Mg0.2O3 improved its ionic conductivity significantly while the oxygen transfer number decreased slightly. For an example, the electrical conductivity of La0.8Sr0.2Ga0.8Mg0.11Co0.09O3 was about 0.21 S•cm-1, and the oxygen transfer number was about 0.87 at 1073 K, while the electrical conductivity of La0.8Sr0.2Ga0.8Mg0.2O3 was about 0.12 S•cm-1, and the oxygen transfer number was close to 1.
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