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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >La0.8Sr0.2FeO3-delta as Fuel Electrode for Solid Oxide Reversible Cells Using LaGaO3-Based Oxide Electrolyte
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La0.8Sr0.2FeO3-delta as Fuel Electrode for Solid Oxide Reversible Cells Using LaGaO3-Based Oxide Electrolyte

机译：La0.8Sr0.2FeO3-δ作为基于LaGaO3的氧化物电解质的固体氧化物可逆电池的燃料电极

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摘要

Activity of La0.8Sr0.2FeO3 (LSF) to the fuel electrode reaction in solid oxide reversible cells (SORCs) was investigated by using La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) and Ba0.6La0.4CoO3 (BLC) as electrolyte and air electrode, respectively. In electrolysis mode (SOEC), the LSF electrode exhibited small overpotential under the atmosphere without H-2 cofeeding; the current densities reached -1.42, -0.92, and -0.36 A/cm(2) at 1.4 V at 900, 800, and 700 degrees C, respectively, and the H-2 formation rate is well agreed with that estimated by Faraday's law. On the other hand, in the SOEC-SOFC reversible mode with the gas composition of 20% steam/20%H-2/60% Ar, the maximum power densities of 0.42, 0.28, and 0.11 W/cm(2) were achieved at 900, 800, and 700 degrees C, respectively. In addition, the cyclic reversible operation was also investigated at 800 degrees C, and it was found that the cell showed high stability over 30 cycles. DC polarization measurement suggests that the exchange current density of LSF is 14 mA/cm(2) at 700 degrees C, which is almost the same as that of Ni-YSZ reported. X-ray diffraction (XRD) measurement and scanning electron microscopy (SEM) observation after the reversible measurement suggest that LSF is highly stable under SOEC-SOFC cyclic operation conditions. Therefore, LSF is promising as the fuel electrode for SORCs, although the conductivity is not sufficiently high as an electrode.
机译：以La0.9Sr0.1Ga0.8Mg0.2O3（LSGM）和Ba0.6La0.4CoO3（BLC）为电解质，研究了La0.8Sr0.2FeO3（LSF）对固体氧化物可逆电池（SORC）中燃料电极反应的活性。和空气电极。在电解模式（SOEC）中，LSF电极在没有H-2共同进料的情况下在大气下显示出小的过电势。在900 V，800和700摄氏度下，在1.4 V下电流密度分别达到-1.42，-0.92和-0.36 A / cm（2），并且H-2形成速率与法拉第定律估计的速率完全一致。另一方面，在气体成分为20％蒸汽/ 20％H-2 / 60％Ar的SOEC-SOFC可逆模式下，获得的最大功率密度为0.42、0.28和0.11 W / cm（2）分别在900、800和700摄氏度。另外，还在800℃下研究了循环可逆操作，发现电池在30个循环中显示出高稳定性。直流极化测量表明，在700摄氏度时LSF的交换电流密度为14 mA / cm（2），与报道的Ni-YSZ几乎相同。可逆测量后的X射线衍射（XRD）测量和扫描电子显微镜（SEM）观察表明，LSF在SOEC-SOFC循环运行条件下非常稳定。因此，尽管电导率不足以用作电极，但LSF有望用作SORC的燃料电极。

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