Mixed ionic-electronic conductors in the family of LaxSr1-xCoyFe1-y O3-δ have been widely studied as cathode materials for solid oxide fuel cells （SOFCs）. However, the long-term stability was a concern. Here we rep...Mixed ionic-electronic conductors in the family of LaxSr1-xCoyFe1-y O3-δ have been widely studied as cathode materials for solid oxide fuel cells （SOFCs）. However, the long-term stability was a concern. Here we report our findings on the effect of a thin film coating of La0.85Sr0.15MnO3-δ （LSM） on the performance of a porous La0.6Sr0.4Co0.2Feo.8O3-δ（LSCF） cathode. When the thicknesses of the LSM coatings are appropriate, an LSM-coated LSCF electrode showed better stability and lower polarization （or higher activity） than the blank LSCF cathode without LSM infiltration. An anode-supported cell with an LSM-infiltrated LSCF cathode demonstrated at 825 ℃ a peak power density of -1.07 W/cm2, about 24% higher than that of the same cell without LSM infiltration （-0.86 W/cm2）. Further, the LSM coating enhanced the stability of the electrode; there was little degradation in performance for the cell with an LSM-infiltrated LSCF cathode during 100 h operation.展开更多
La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)钙钛矿型复合氧化物具有优良的电子-离子混合导电性能,是目前温固体氧化物燃料电池(SOFC)最理想中的阴极材料之一。以水和乙醇作为溶剂,按照La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)的元素摩...La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)钙钛矿型复合氧化物具有优良的电子-离子混合导电性能,是目前温固体氧化物燃料电池(SOFC)最理想中的阴极材料之一。以水和乙醇作为溶剂,按照La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)的元素摩尔比为6∶4∶2∶8的元素比配制溶液,采用超声喷雾裂解方法,在700℃时通过喷雾裂解制备球形LSCF粉体。该粉体和GDC电解质按照7∶3的比例,制备阴极浆料,涂于NiO-GDC||GDC半电池电解质表面,并在1150℃烧结制备电池阴极。通过SEM、XRD等表征手段研究粉体以及电池阴极结构,并研究了LSCF-GDC复合阴极材料的电性能。研究表明,该电池在750℃条件下的电池性能达到了553 m W·cm^(-2),电池性能比固相法制备的阴极粉体性能高出111 m W·cm^(-2),展现了较好的电催化活性。展开更多
通过溶胶凝胶-自燃烧法制备了阴极La0.6Sr0.4Co0.2Fe0.8O3(LSCF)粉体。以NiO-GDC||GDC为阳极和电解质上并在GDC电解质表面,制备了GDC-LSCF复合阴极。采用离子浸渍法在GDC-LSCF阴极内部制备了IrO2功能材料,并比较了在不同温度和浸渍量下...通过溶胶凝胶-自燃烧法制备了阴极La0.6Sr0.4Co0.2Fe0.8O3(LSCF)粉体。以NiO-GDC||GDC为阳极和电解质上并在GDC电解质表面,制备了GDC-LSCF复合阴极。采用离子浸渍法在GDC-LSCF阴极内部制备了IrO2功能材料,并比较了在不同温度和浸渍量下燃料电池的输出效果。采用XRD、SEM和电化学工作站等表征方法对该电池和复合阴极进行研究。研究表明通过离子浸渍法在GDC-LSCF复合阴极骨架的表面,形成了大量的IrO2纳米颗粒,该纳米颗粒大幅度增加了三相反应界面的长度。当IrO2浸渍量为0.5 wt%的时候,燃料电池的性能在750℃的功率密度为492 m W·cm^-2,电化学阻抗为1.30Ω·cm^2,该电池表现出较好的性能和较低的阻抗,这与IrO2较好的电子电导和催化活性有关。该电池在中温条件700℃、750℃和800℃的电池功率分别为493 mW·cm^2、581 mW·cm^2、632 m W·cm^2,具有较好的中温操作特性。展开更多
基金supported by the Department of Energy (National Energy Technology Laboratory) SECA Core Technology Program under Award Number DE-NT0006557 and DE-FE0009652by NSFC under grant No.51002182
文摘Mixed ionic-electronic conductors in the family of LaxSr1-xCoyFe1-y O3-δ have been widely studied as cathode materials for solid oxide fuel cells （SOFCs）. However, the long-term stability was a concern. Here we report our findings on the effect of a thin film coating of La0.85Sr0.15MnO3-δ （LSM） on the performance of a porous La0.6Sr0.4Co0.2Feo.8O3-δ（LSCF） cathode. When the thicknesses of the LSM coatings are appropriate, an LSM-coated LSCF electrode showed better stability and lower polarization （or higher activity） than the blank LSCF cathode without LSM infiltration. An anode-supported cell with an LSM-infiltrated LSCF cathode demonstrated at 825 ℃ a peak power density of -1.07 W/cm2, about 24% higher than that of the same cell without LSM infiltration （-0.86 W/cm2）. Further, the LSM coating enhanced the stability of the electrode; there was little degradation in performance for the cell with an LSM-infiltrated LSCF cathode during 100 h operation.
文摘La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)钙钛矿型复合氧化物具有优良的电子-离子混合导电性能,是目前温固体氧化物燃料电池(SOFC)最理想中的阴极材料之一。以水和乙醇作为溶剂,按照La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)的元素摩尔比为6∶4∶2∶8的元素比配制溶液,采用超声喷雾裂解方法,在700℃时通过喷雾裂解制备球形LSCF粉体。该粉体和GDC电解质按照7∶3的比例,制备阴极浆料,涂于NiO-GDC||GDC半电池电解质表面,并在1150℃烧结制备电池阴极。通过SEM、XRD等表征手段研究粉体以及电池阴极结构,并研究了LSCF-GDC复合阴极材料的电性能。研究表明,该电池在750℃条件下的电池性能达到了553 m W·cm^(-2),电池性能比固相法制备的阴极粉体性能高出111 m W·cm^(-2),展现了较好的电催化活性。
文摘通过溶胶凝胶-自燃烧法制备了阴极La0.6Sr0.4Co0.2Fe0.8O3(LSCF)粉体。以NiO-GDC||GDC为阳极和电解质上并在GDC电解质表面,制备了GDC-LSCF复合阴极。采用离子浸渍法在GDC-LSCF阴极内部制备了IrO2功能材料,并比较了在不同温度和浸渍量下燃料电池的输出效果。采用XRD、SEM和电化学工作站等表征方法对该电池和复合阴极进行研究。研究表明通过离子浸渍法在GDC-LSCF复合阴极骨架的表面,形成了大量的IrO2纳米颗粒,该纳米颗粒大幅度增加了三相反应界面的长度。当IrO2浸渍量为0.5 wt%的时候,燃料电池的性能在750℃的功率密度为492 m W·cm^-2,电化学阻抗为1.30Ω·cm^2,该电池表现出较好的性能和较低的阻抗,这与IrO2较好的电子电导和催化活性有关。该电池在中温条件700℃、750℃和800℃的电池功率分别为493 mW·cm^2、581 mW·cm^2、632 m W·cm^2,具有较好的中温操作特性。
