Investigation on Ba2Fe1.3Mo0.7O6-δ Double Perovskite as Anode Material for Solid Oxide Fuel Cell

doi:10.12422/j.issn.1672-6952.2024.01.005

Abstract

Abstract:

The Fe/Mo ordering at B?sites of Ba₂FeMoO_6-_δ (BFM) were changed by adjusting Fe/Mo amount of substance ratio (i.e., stoichiometric ratio), and then a new double?perovskite anode material Ba₂Fe_1.3Mo_0.7O_6-_δ (BFM_0.7) for SOFC were obtained. The results indicated that the electrical conductivity of the BFM_0.7 anode is 15.0~20.0 S/cm at 600~800 ℃ in H₂, which is much larger than that of the lowest target for SOFC electrode (0.1 S/cm). The peak power density and polarization resistance of the BFM_0.7anode cell attained 1 149 mW/cm² and 0.15 Ω·cm² at 850 ℃. Compared with BFM anode, the performance of BFM_0.7 is significantly improved. In addition, the performance of BFM_0.7 anode cell showed no degradation after testing for 39 h, indicating that the BFM_0.7 anode possesses has excellent electrochemical stability.

Key words: Solid oxide fuel cell, Anode, Electrical conductivity, Electrochemical performance

摘要：

通过改变Ba₂FeMoO_6-_δ （BFM）中Fe与Mo的物质的量比调控双钙钛矿晶格B位有序性，制备了一种高性能新型SOFC双钙钛矿阳极材料Ba₂Fe_1.3Mo_0.7O_6-_δ （BFM_0.7）。结果表明，BFM_0.7在H₂中600~800 ℃的电导率为15.0~20.0 S/cm，远高于SOFC电极的最低标准（0.1 S/cm）。BFM_0.7用作SOFC阳极时，单电池在850 ℃的最大功率密度和极化阻抗分别为1 149 mW/cm²和0.15 Ω·cm²。相比于BFM阳极，BFM_0.7的性能显著提高。此外，BFM_0.7阳极电池连续工作39 h性能无衰减，表明BFM_0.7阳极具有优异的电化学稳定性。

关键词: 固体氧化物燃料电池, 阳极, 电导率, 电化学性能

CLC Number:

TQ15

Xiaogang SU, Zhaoyuan SONG, Leilei ZHANG. Investigation on Ba₂Fe_1.3Mo_0.7O_6-_δ Double Perovskite as Anode Material for Solid Oxide Fuel Cell[J]. Journal of Liaoning Petrochemical University, 2024, 44(1): 29-34.

苏晓刚, 宋昭远, 张磊磊. 双钙钛矿氧化物Ba₂Fe_1.3Mo_0.7O_6-_δ 作固体氧化物燃料电池阳极的研究[J]. 辽宁石油化工大学学报, 2024, 44(1): 29-34.

Figures/Tables 10

Fig.1 XRD pattern for BFM0.7 and Ba2FeMoO6 samples

Fig.2 Electrical conductivity and Surface SEM for BFM0.7 sample

Fig.3 EIS for BFM0.7 anode

Fig. 4 EIS fitting curve for BFM0.7 anode symmetric cell

Table 1 EIS fitting parameters of BFM0.7 anode

拟合参数	数值	拟合参数	数值	拟合参数	数值
R₀/(Ω•cm²)	0.408 4	f₁/Hz	194.400 0	R₃/(Ω•cm²)	0.894 0
L₀/H	1.956 0×10^-7	R₂/(Ω•cm²)	0.375 0	CPE₃⁃T/(F•cm^-2)	1.609 0
R₁/(Ω•cm²)	0.086 0	CPE₂⁃T/(F•cm^-2)	0.688 6	CPE₃⁃P	1.135 0
CPE₁⁃T/(F•cm^-2)	0.064 0	CPE₂⁃P	0.672 6	C₃/(F•cm^-2)	1.540 9
CPE₁⁃P	0.732 0	C₂/(F•cm^-2)	0.356 3	f₃/Hz	0.115 6
C₁/(F•cm^-2)	9.530 0×10^-3	f₂/Hz	1.192 0

Fig.5 Temperature dependent polarization impedance curve for BFM0.7 anode

Fig.6 Arrhenius plot of polarization resistance for BFM0.7 anode

Fig.7 I?V and I?P curves for BFM0.7 anode cell

Fig.8 Stability of BFM0.7 anode cell

Fig.9 SEM image of cross?section of BFM0.7 anode cell after stability testing

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Investigation on Ba₂Fe_1.3Mo_0.7O_6-_δ Double Perovskite as Anode Material for Solid Oxide Fuel Cell

双钙钛矿氧化物Ba₂Fe_1.3Mo_0.7O_6-_δ 作固体氧化物燃料电池阳极的研究

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Figures/Tables 10

References 24

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