Structural Stability of Ni-Fe Supported Solid Oxide Fuel Cells Based on Stress Analysis

doi:10.15541/jim20180398

Abstract

Abstract:

Metal supported solid oxide fuel cells (MS-SOFCs) were fabricated with NiO and Fe₂O₃ by tape casting, screen printing, sintering and in-situ reducing process with NiO and Fe₂O_3. The fraction effects of Fe on residual stress, bending strength and electrochemical stability of MS-SOFC were systematically investigated. The addition of 10at% Fe₂O₃ in characteristic support elevated densification starting temperature up to 937 ℃, and reduced residual stress and buckling deformation to 70 MPa and 0.15 mm, respectively. After reduction, Ni_0.9Fe_0.1supported SOFC presented the maximum bending strength of 62.34 MPa due to the lowest porosity of 40.22% in metal scaffold. MS-SOFC steadily operated for 60 h in durability test with H₂ as the fuel at a constant current density of 400 mA·cm ^-2 and 650 ℃. This superior performance was attributed to the higher fracture strength of Ni_0.9Fe_0.1alloy support SOFC, which effectively resisted the thermal stress in operation. This research provides a promising theoretical basis for structure design and optimization of MS-SOFC.

Key words: metal supported solid oxide fuel cell, Ni-Fe alloy support, thermal stress

CLC Number:

TQ174

Kai LI, Xiao LI, Jian LI, Jia-Miao XIE. Structural Stability of Ni-Fe Supported Solid Oxide Fuel Cells Based on Stress Analysis[J]. Journal of Inorganic Materials, 2019, 34(6): 611-617.

Figures/Tables 10

Table 1 Material properties of MS-SOFC components

Materials	Temperature/℃	Elasticity modulus/GPa	Poisson ratio	CTE/ ×10^-6
N	25	180	0.310	16.3
N	1350	176	0.310	15.9
NF91	25	150	0.268	14.8
NF91	1350	148	0.281	14.1
NF73	25	146	0.270	14.2
NF73	1350	143	0.280	13.6
NF55	25	140	0.280	14.1
NF55	1350	132	0.290	13.6
NiO+GDC	25	190	0.292	14.2
NiO+GDC	1350	192	0.300	13.8
GDC	25	260	0.262	13.6
GDC	1350	290	0.264	13.1

Fig. 1 XRD patterns of N, NF91, NF73 and NF55 support

Fig. 2 Cross-sectional micrographs of MS-SOFC with N, NF91, NF73, and NF55 supports

Fig. 3 Sintering curves of N, NF91, NF73, NF55 supports and GDC

Fig. 4 Residual stress maps of N, NF91, NF73 and NF55 supports at room temperature

Fig. 5 Deformation and displacement diagrams of MS-SOFC with N, NF91, NF73 and NF55 supports

Fig. 6 Flexure strength of MS-SOFC with N, NF91, NF73 and NF55 supports before and after reduction

Fig. 7 I-V-P curves of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports

Fig. 8 Impedance spectra of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports

Fig. 9 Stability tests of SOFC with Ni, Ni0.9Fe0.1, Ni0.7Fe0.3 and Ni0.5Fe0.5 supports at 650 ℃ and a constant current density of 400 mA·cm-2

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