Electrode Performance Test on Single Ceramic Fuel Cells Using as Electrolyte Sr‐ and Mg‐Doped LaGaO3 (original) (raw)
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Journal of Alloys and Compounds, 2000
In this paper we review a systematic study on the properties of the superior oxide-ion conductor Sr-and Mg-doped LaGaO (LSGM) 3 and its performance in a single fuel cell. The conductivity of the oxygen-deficient perovskite phase was shown to be purely ionic over a 222 wide range of oxygen partial pressures 10 #P #1 atm. The highest values of the oxide-ion conductivity, s 50.17, 0.08 and 0.03 O o 2 S / cm, were found for La Sr Ga Mg O at 800, 700 and 6008C, respectively; they remained stable over a weeklong test. The 0.8 0.2 0.83 0.17 2.815 reactivity of Ni and LSGM suggested use of a thin interlayer at the anode-electrolyte interface to prevent formation of lanthanum 2 nickelates; Ce Sm O (SDC) was selected for the interlayer. The peak power density of the interlayered cell is 100 mW/ cm higher 0.8 0.2 1.9
Journal of The Electrochemical Society, 1999
The electrode performance of a single solid-oxide fuel cell (SOFC) was evaluated using a 500 m thick La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 0.3 (LSGM) as the electrolyte membrane. A doped lanthanum cobaltite, La 0.6 Sr 0.4 CoO 3Ϫ␦ was selected as the cathode material, and a samaria-doped ceria-NiO composite powder was used as the anode material. The spray-pyrolysis method was applied for synthesis of the starting powders of the cathode and anode. In this study, different microstructures of the cathode were obtained by varying the sintering temperature from 950 to 1200ЊC. High power density (the maximum power density of the cell was about 425 mW/cm 2 , which is 95% of the theoretical value) of the solid oxide fuel cell at 800ЊC was achieved. The cell performance showed that, with a proper choice of electrode materials with optimized microstructure and LSGM as the electrolyte, a SOFC operating at temperatures T op ≤ 800 is a realistic goal.
Upgrading the performance of La2Mo2O9-based solid oxide fuel cell under single chamber conditions
International Journal of Hydrogen Energy, 2012
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Journal of Power Sources, 2006
Anode-supported solid oxide fuel cells (SOFCs) with lanthanum-doped ceria (LDC)/Sr-, Mg-doped LaGaO 3 (LSGM) bilayered or LDC/LSGM/LDC trilayered electrolyte films were fabricated with a pure La 0.6 Sr 0.4 CoO 3 (LSC) cathode. The behaviors of the two electrolytes in cells were investigated by using scanning electron microscopy, impedance spectroscopy and cell performance measurements. The reactions between LSGM and anode material can be suppressed by applying a ca. 15 m LDC film. Due to the Co diffusion from the LSC cathode to the LSGM electrolyte during high temperature sintering, the electronic conductivity of the LDC electrolyte cannot be completely blocked with an LSGM layer below 50 m, which leads to open-circuit potentials of these cells of ca. 0.988 V at 800 • C. The electrical conductivities of LDC and LSGM electrolytes in the cells under operation conditions are obtained from the dependence of the cell ohmic resistance on the electrolyte thickness. The electrical conductivity of LDC electrolyte is ca. 0.117 S cm −1 at 800 • C on the bilayered electrolyte cells with a 50 m LSGM layer. The bilayer electrolyte cells with a 25 m LDC layer at 800 • C, had a cell ohmic resistance two-stage linear dependence on the LSGM layer thickness, which showed the electrical conductivity of ca. 1.9 S cm −1 for the LSGM layer below 50 m and 0.22 S cm −1 for the LSGM layer above 100 m. With a LDC/LSGM/LDC trilayered electrolyte film for the anode-supported cell, an open-circuit potential of 1.043 V was achieved.
2014
The anode-supported solid oxide fuel cell (SOFC) is constructed by a screen-printed double-layer cathode, an airtight yttriastabilized zirconia (YSZ) as electrolyte, and a porous Ni-YSZ as anode substrate. A thin Ni film is fabricated as an anode current collector layer to improve the performance of the SOFC. The operation parameters are systematically investigated, such as feed rates of the reactants, operation temperature, contact pressure between current collectors and unit cell on the cell performance. The SEM results show that the YSZ thin film is fully dense with a thickness of 8¯m and exhibits the good compatibility between cathode and electrolyte layers. The maximum power density of the cell with Ni current collector layer is 366 mW cm ¹2 at 800°C. This value is approximately 1.3 times higher than that of the cell without Ni layer. According to the electrochemical results, the Ni current collector layer decreases the ohmic and polarization resistances. The contact pressure results between cell and test housing show that cell performance efficiency is enhanced at the high current density region.
Journal of Electronic Materials, 2020
La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d (LSCF) cathode perovskite prepared by a Pechini method deposited on ceria co-doping Ce 0.8 Sm 0.17 Ln 0.03 O 1.9 (LnSDC), with (Ln = La, Y, and Nd) electrolytes was successfully prepared by the solid-state reaction method. In this preparation process, thick and thin films of LSCF were deposited upon dense Ln-doped ceria LnSDC electrolytes after 5 and 3 spin-coating and dip-coating cycles, respectively. Two layers of LSCF were deposited by screen-printing in order to obtain thick cathode films. After deposition, some structural and morphologic characterizations, such as X-ray diffraction analysis and scanning electron microscopy, have been conducted to understand the properties of the elaborated samples and to study the impact of doping on these properties. Electrochemical impedance spectroscopy measurements on symmetric cells were also performed to investigate the employability of L 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-d as a cathode material deposited upon LnSDC electrolytes for intermediate-temperature solid oxide fuel cells (IT-SOFC). According to what was available and inferred after studying the images from a scanning electron microscope, no cracks or significant segregation were detected in the LSCF/LnSDC interface. This behavior is consistent with the good thermal expansion compatibility between the two materials. Electrochemical impedance spectroscopy investigations at 700°C, indicate relatively low area-specific resistance between 0.048 and 0.1 X cm 2 for all symmetrical cell LSCF/doped electrolyte/LSCF. All the cells were previously sintered above 1400°C, in air. All these results showed that L 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3d can stand as a potential candidate for new cathode material in IT-SOFCs.
Journal of Power Sources, 2008
La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 2.8 (LSGM8080) powder, showing the highest electrical conductivity among LSGMs of various compositions, is synthesized using the glycine nitrate process (GNP) and used as the electrolyte for an intermediate-temperature solid oxide fuel cell (IT-SOFC). The LDC (Ce 0.55 La 0.45 O 1.775) powder is synthesized by a solid-state reaction and employed as the material for a buffer layer to prevent the reaction between the anode and electrolyte materials. The LDC also serves as the skeleton material for the anode. An anode-supported single cell with an active area of 1 cm 2 is constructed for performance evaluation. A single-cell test is performed at 750 and 800 • C. The maximum power density of the cell 459 and 664 mW cm −2 at 750 and 800 • C, respectively.