Preparation and electrochemical stability of Co-doped La1.5Sr0.5Ni1−xCoxO4+δ cathode materials

LI Ning; LI Song-bo; AN Sheng-li; DU Xu; XUE Liang-mei; NI Yang

doi:10.1016/S1872-5813(22)60057-4

Volume 51 Issue 4

Apr. 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(4): 511-518

LI Ning, LI Song-bo, AN Sheng-li, DU Xu, XUE Liang-mei, NI Yang. Preparation and electrochemical stability of Co-doped La1.5Sr0.5Ni1−xCoxO4+δ cathode materials[J]. Journal of Fuel Chemistry and Technology, 2023, 51(4): 511-518. doi: 10.1016/S1872-5813(22)60057-4

Citation:

LI Ning, LI Song-bo, AN Sheng-li, DU Xu, XUE Liang-mei, NI Yang. Preparation and electrochemical stability of Co-doped La_1.5Sr_0.5Ni_1−xCo_xO_4+δ cathode materials[J]. Journal of Fuel Chemistry and Technology, 2023, 51(4): 511-518. doi: 10.1016/S1872-5813(22)60057-4

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Preparation and electrochemical stability of Co-doped La_1.5Sr_0.5Ni_1−xCo_xO_4+δ cathode materials

doi: 10.1016/S1872-5813(22)60057-4

1.
School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia Baotou 014010, China
2.
School of Metallurgical and Material Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia Baotou 014010, China

Funds: The project was supported by National Natural Science Foundation of China (51974167) and Scientific Research Program of Inner Mongolia higher education institutions (NJZZ22449)

Received Date: 2022-06-13
Accepted Date: 2022-07-25
Rev Recd Date: 2022-07-19

Available Online: 2022-08-15

Publish Date: 2023-04-15

Abstract

Abstract

A series of Co-doped La_1.5Sr_0.5Ni_1−xCo_xO_4+δ cathode materials ( x =0, 0.2, 0.4 and 0.6) were synthesized by sol-gel method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), coefficient of thermal expansion (CTE) measurement and scanning electron microscope (SEM). The results suggest that all La_1.5Sr_0.5Ni_1−xCo_xO_4+δ samples have a single pure phase with the perovskite-like structure and the doping with the Co element can increase the CTE value. Using La_1.5Sr_0.5Ni_1−xCo_xO_4+δ as the cathode materials in the solid oxide fuel cell (SOFC), their electrical conductivity and electrochemical impedance spectroscopy were measured. The results indicate that the conductivity increases with the increase of Co doping amount and the La_1.5Sr_0.5N_i0.6Co_0.4O_4+δ sample with x = 0.4 displays the highest conductivity of 51.21 S/cm at 800 ℃; however, a higher content of Co (x > 0.4) leads to a decrease of the conductivity. In addition, La_1.5Sr_0.5N_0.6Co_0.4O_4+δ exhibits the lowest polarization resistance of 4.180 Ω·cm² in electrochemical impedance spectrum at 700 ℃, displaying its excellent electrochemical properties as the cathode materials.
- solid oxide fuel cell,
- perovskite-like structure,
- cathode material

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References(29)

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