Abstract
As a potential cathode material, the La1.5 – xEuxPr0.5Ni0.9Cu0.1O4 + δ (LEPNC-x, x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, and 0.8) oxide is synthesized and studied. A pure Ruddlesden–Popper (R–P) type K2NiF4 structure can only be obtained for x = 0.4 and lower. The thermal expansion coefficient (TEC) of Eu-doped LEPNC-x stays almost constant with temperature, and decreases with increasing x. The optimal electrochemical performance of NiO-BZCY|BZCY|LEPNC-x single cells can be achieved for x = 0.2, although the corresponding electrical conductivity is the lowest. The result of electrochemical impedance spectra (EIS) also confirms this conclusion. EIS analysis suggests that the pre-exponential factor and activation energy of polarization resistance should be mainly determined by the electrical conductivity and oxygen ion diffusion of cathode material, respectively.
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Funding
This work was supported by the National Natural Science Foundation of China (grant nos. U2004167 and 1974316).
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Changhui Wu: conceptualization, methodology, validation, formal analysis, investigation, writing-original draft. Yunjia Shi: investigation, methodology, formal analysis. Fei Lu: methodology, validation. Xusheng Jia: methodology, validation. Jinrui Su: formal analysis, resources. Hao He: formal analysis, resources. Bin Cai: conceptualization, formal analysis, investigation, writing review and editing, supervision, project administration, funding acquisition.
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Wu, C.H., Shi, Y.J., Lu, F. et al. Ruddlesden–Popper-Type La1.5 – xEuxPr0.5Ni0.9Cu0.1O4 + δ as a Potential Cathode Material for H-SOFCs. Phys. Solid State 63, 775–784 (2021). https://doi.org/10.1134/S1063783421050218
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DOI: https://doi.org/10.1134/S1063783421050218