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

doi:10.15541/jim20190067

摘要/Abstract

摘要：

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Sr₂Fe_1.5Mo_0.5O₆的钙钛矿材料(Sr_2-_xCa_xFe_1.5Mo_0.5O_6-_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|La_0.9Sr_0.1Ga_0.8Mg_0.2O₃(LSGM)| SC_0.6FMO。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0.41 W?cm ^-2。以上结果表明Sr_2-_xCa_xFe_1.5Mo_0.5O_6-_δ可以作为高效对称燃料电池的电极催化剂。

关键词: 对称固体氧化物燃料电池, 钙钛矿结构, 电极材料

Abstract:

A series of Ca-substituted Sr₂Fe_1.5Mo_0.5O_6-_δ oxides, Sr_2-_xCa_xFe_1.5Mo_0.5O_6-_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-SC_0.6FMO|La_0.9Sr_0.1Ga_0.8Mg_0.2O₃(LSGM)|SC_0.6FMO, 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 SC_0.6FMO is a potential electrode material for symmetrical solid oxide fuel cells.

Key words: Symmetrical Solid Oxide Fuel Cells, perovskite, electrode materials

中图分类号:

TQ174

夏天, 孟燮, 骆婷, 占忠亮. Ca掺杂Sr₂Fe_1.5Mo_0.5O_6-_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[J]. 无机材料学报, 2019, 34(10): 1109-1114.

XIA Tian, MENG Xie, LUO Ting, ZHAN Zhong-Liang. Synthesis and Evaluation of Ca-doped Sr₂Fe_1.5Mo_0.5O_6-_δ as Symmetrical Electrodes for High Performance Solid Oxide Fuel Cells[J]. Journal of Inorganic Materials, 2019, 34(10): 1109-1114.

图/表 6

Fig. 1 XRD patterns of Sr2-xCaxFe1.5Mo0.5O6-δ powders synthetized in air (a) and reduced in humidified hydrogen (b) at 800 ℃ for 4 h; (c) Magnified view of the diffraction peak at 67.5°

Fig. 2 Measured H2-TPR profiles for Sr2-xCaxFe1.5Mo0.5O6-δ powders with a ramp rate of 10 ℃·min-1

Fig. 3 Cross-sectional SEM micrographs showing impregnated fuel cells (a) Low magnification; (b) High magnification

Fig. 4 (a) EIS plots of the Sr2-xCaxFe1.5Mo0.5O6-δ symmetrical cells measured in humidified hydrogen at 800 ℃, and (b) Arrhenius plots of the anode polarization resistances over the temperature range of 650-800 ℃

Fig. 5 (a) EIS plots of the Sr2-xCaxFe1.5Mo0.5O6-δ symmetrical cells measured in air at 800 ℃, and (b) Arrhenius plots of the cathode polarization resistances over the temperature range of 650-800 ℃

Fig. 6 (a) Voltage and power density versus current density for a symmetrical fuel cell with Sr2-xCaxFe1.5Mo0.5O6-δ(x=0.6) electrode measured in humidified hydrogen fuel and dry air over the temperature range of 650-800 ℃; (b) Nyquist plots of impedance data measured at open circuits; (c) Maximum power densities of the symmetrical SCFMO electrode cells at different Ca2+ substitutions over the temperature range of 650-800 ℃

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Ca掺杂Sr₂Fe_1.5Mo_0.5O_6-_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

Synthesis and Evaluation of Ca-doped Sr₂Fe_1.5Mo_0.5O_6-_δ as Symmetrical Electrodes for High Performance Solid Oxide Fuel Cells

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