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Article Dans Une Revue International Journal of Hydrogen Energy Année : 2024

Study on the effects of configuration entropy to electrochemical properties of A2BO4-type cathode materials for SOFCs

Résumé

High entropy oxides are one of the research topicalities in the field of SOFC. However, the relationship between configuration entropy and the electrochemical properties of these materials is not well understood. Here, a medium entropy material (La0.2Pr0.2Nd0.2Sm0.2Eu0.2)2CuO4 ((Ln0.2)2CuO4) derived from Nd2CuO4 material is designed. It was found that increasing the configuration entropy of the A-site promotes the production of highly reactive/concentrated non-stoichiometric oxygen and increases the covalency of the Cu3d-O2p orbital. The polarization impedance of (Ln0.2)2CuO4 is 0.92 Ω cm2 at 700 °C, which is smaller than that of Nd2CuO4 (1.8 Ω cm2 at 700 °C). The peak power density of single cells NiO-YSZ|YSZ|GDC|cathode is 526 mW cm−2 at 700 °C within 60 h of stable operation at 0.5 V. First-principles calculations demonstrate that (Ln0.2)2CuO4 has lower charge transfer energy, which promotes the electronic conduction. Furthermore, the dissociation energy of adsorbed oxygen (Oad) on the surface of (Ln0.2)2CuO4 is 2.24 eV, which is smaller than that of Nd2CuO4 (2.26 eV). These results suggest that the entropy-increasing strategy can enhance the electrocatalytic performance.

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Matériaux
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Dates et versions

hal-04689619 , version 1 (05-09-2024)

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Chao Huang, Qiang Li, Liping Sun, Lihua Huo, Hui Zhao, et al.. Study on the effects of configuration entropy to electrochemical properties of A2BO4-type cathode materials for SOFCs. International Journal of Hydrogen Energy, 2024, 84, pp.759-767. ⟨10.1016/j.ijhydene.2024.08.316⟩. ⟨hal-04689619⟩

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