Ca掺杂Sr2Fe1.5Mo0.5O6–δ材料的合成与作为对称固体氧化物燃料电池电极催化剂的性能研究（英文）

Synthesis and Evaluation of Ca-doped Sr2Fe1.5Mo0.5O6–δ as Symmetrical Electrodes for High Performance Solid Oxide Fuel Cells

对称固体氧化物燃料电池由于生产过程简单、成本低,受到了研究者的广泛关注。然而较低的电极催化性能制约了其进一步的发展。本研究利用溶胶–凝胶法合成了一系列钙取代Sr2Fe1.5Mo0.5O6的钙钛矿材料(Sr2–xCaxFe1.5Mo0.5O6–δ, x=0, 0.2, 0.4, 0.6),并研究了其作为对称固体氧化物燃料电池电极催化剂的性能。X射线衍射(XRD)测试表明所有样品在空气与氢气气氛中均能保持立方钙钛矿结构。而在程序升温还原(TPR)过程中, Ca^2+的掺入能有效降低还原温度,提升其对析氧反应的催化活性。对称阳极电池在氢气气氛中的测试表明,当Ca^2+的掺入量为0.6时电池极化阻抗最小。利用流延骨架与湿化学浸渍法制备了单电池SC(0.6FMO|La0.9Sr0.1Ga0.8Mg0.2O3(LSGM)|SC0.6FMO。以氢气作为燃料时,单电池在800与650℃的最大功率密度分别为1.05与0.41W·cm^–2。以上结果表明Sr2–xCaxFe1.5Mo0.5O6–δ可以作为高效对称燃料电池的电极催化剂。

A series of Ca-substituted Sr2Fe1.5Mo0.5O6–δ oxides, Sr2–xCaxFe1.5Mo0.5O6–δ(SCFMO, x=0, 0.2, 0.4 and 0.6), were synthesized and evaluated as potential electrodes for symmetrical solid oxide fuel cells. X-ray diffraction examination showed that all samples maintained cubic perovskite structure in both air and wet hydrogen atmospheres. Temperature programmed reduction measurements indicated that the Ca^2+ substitution promoted the catalytic activity of SCFMO toward oxygen evolution reactions. Symmetrical anode fuel cell measurements showed the lowest polarization resistance in humidified hydrogen emerged at x=0.6. Single cells-SC0.6 FMO|La0.9 Sr0.1 Ga0.8 Mg0.2 O3(LSGM)|SC0.6 FMO, fabricated via tape-casting and impregnation methods, produced peak power densities of 1.05 W·cm^–2 at 800 ℃ and 0.41 W·cm^–2 at 650 ℃ when operating on hydrogen fuels and air oxidants. These results demonstrate SC0.6 FMO is a potential electrode material for symmetrical solid oxide fuel cells.