Symmetrical La3+-doped Sr2Fe1.5Ni0.1Mo0.4O6-δ Electrode Solid Oxide Fuel Cells for Pure CO2 Electrolysis

doi:10.15541/jim20210206

Abstract

Abstract:

Electrochemical reduction of the greenhouse gas CO₂ in solid oxide electrolysis cells (SOECs) has attracted much attention due to their high energy conversion efficiency and great potential for carbon cycling. Compared with the asymmetrical configuration, symmetrical SOECs with the same material as anode and cathode, can greatly simplify the fabrication process and reduce the complication associated with varied interfaces. Perovskite oxides La_xSr_2-_xFe_1.5Ni_0.1Mo_0.4O_6-_δ (L_xSFNM, x=0.1, 0.2, 0.3 and 0.4) are prepared and evaluated as symmetrical electrodes in solid oxide electrolysis cells for electrochemical reduction of pure CO₂. The polarization resistances are 0.07 Ω∙cm² in air and 0.62 Ω∙cm² in 50% CO-50% CO₂ for L_0.3SFNM electrode at 800 ℃. An electrolysis current density of 1.17 A∙cm^-2 under 800 ℃ at 1.5 V is achieved for the symmetrical SOECs in pure CO₂. Furthermore, the symmetrical cell demonstrates excellent stability during the preliminary 50 h CO₂ electrolysis measurements.

Key words: symmetrical solid oxide electrolysis cells, perovskite, electrode materials

CLC Number:

TQ174

WANG Yue, CUI Changsong, WANG Shiwei, ZHAN Zhongliang. Symmetrical La³⁺-doped Sr₂Fe_1.5Ni_0.1Mo_0.4O_6-_δ Electrode Solid Oxide Fuel Cells for Pure CO₂ Electrolysis[J]. Journal of Inorganic Materials, 2021, 36(12): 1323-1329.

Figures/Tables 8

References 32

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Electrode	Electrolyte	Performance/(A∙cm^-2)	Ref.
La_0.3Sr_0.7Fe_0.7Ti_0.3O₃	YSZ	0.52 (2V)	[27]
La_0.6Sr_0.4Fe_0.9Mn_0.1O_3-_δ-GDC	YSZ	1.107 (2V)	[25]
La_0.6Sr_0.4Fe_0.8Ni_0.2O_3-_δ-GDC	YSZ	1.03	[28]
La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-_δ	YSZ	0.442	[29]
La_0.6Ca_0.4Fe_0.8Ni_0.2O_3-_δ-GDC	YSZ	0.78	[13]
La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-_δ	YSZ	0.09	[30]
La_0.3Sr_0.7Cr_0.3Fe_0.7O_3-_δ	YSZ	0.32	[31]
(PrBa)_0.95(Fe_0.9Mo_0.1)₂O₅₊_δ	LSGM	0.51 (1.3V)	[32]
La_0.3Sr_1.7Fe_1.5Ni_0.1Mo_0.4O_6-_δ	LSGM	1.17	This work

Electrode	Electrolyte	Performance/(A∙cm^-2)	Ref.
La_0.3Sr_0.7Fe_0.7Ti_0.3O₃	YSZ	0.52 (2V)	[27]
La_0.6Sr_0.4Fe_0.9Mn_0.1O_3-_δ-GDC	YSZ	1.107 (2V)	[25]
La_0.6Sr_0.4Fe_0.8Ni_0.2O_3-_δ-GDC	YSZ	1.03	[28]
La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3-_δ	YSZ	0.442	[29]
La_0.6Ca_0.4Fe_0.8Ni_0.2O_3-_δ-GDC	YSZ	0.78	[13]
La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-_δ	YSZ	0.09	[30]
La_0.3Sr_0.7Cr_0.3Fe_0.7O_3-_δ	YSZ	0.32	[31]
(PrBa)_0.95(Fe_0.9Mo_0.1)₂O₅₊_δ	LSGM	0.51 (1.3V)	[32]
La_0.3Sr_1.7Fe_1.5Ni_0.1Mo_0.4O_6-_δ	LSGM	1.17	This work

Symmetrical La³⁺-doped Sr₂Fe_1.5Ni_0.1Mo_0.4O_6-_δ Electrode Solid Oxide Fuel Cells for Pure CO₂ Electrolysis

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