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

doi:10.15541/jim20190067

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 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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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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