LI, Li-Ping; LI, Huan; LI, Qiang; HUO, Li-Hua; ZHAO, Hui; BASSAT, Jean-Marc.; ROUGIER, Aline; FOURCADE, Sébastien; GRENIER, Jean-Claude

doi:10.1016/j.jpowsour.2018.04.083

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LI, Li-Ping
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

LI, Huan
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

LI, Qiang
Key Laboratory of Functional Inorganic Material Chemistry [KLFIMC]

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Journal of Power Sources. 2018-07, vol. 392, p. 8-14

Elsevier

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The double perovskite oxides La2-xNiMnO6-δ (x = 0.0, 0.1, 0.2, 0.3) are evaluated as potential cathodes for intermediate temperature solid oxide fuel cells. The effects of La-deficiency on the crystal structure, high temperature thermal and electrical properties, and catalytic activity for oxygen reduction reaction are comprehensively investigated. La2-xNiMnO6-δ crystallizes in monoclinic structure with the space group P21/n. The cell volume expands with the increase of La-deficiency. The highest electrical conductivity of 25 S cm−1 is found for La1.8NiMnO5.71 at 800 °C in air. Introducing La3+ deficiency greatly improves the amount of chemical adsorbed oxygen species on material surface, which promotes the oxygen reduction reaction of La2-xNiMnO6-δ cathode. The optimum composition, La1.8NiMnO5.71 exhibits the lowest area specific resistance of 0.21 Ω cm2 at 700 °C in air. Meanwhile the peak power density of the anode-supported single cell with La1.8NiMnO5.71 cathode reaches 0.6 W cm−2 at 700 °C. The electrochemical impedance spectra measurements combining with distribution of relaxation times analysis prove that the charge transfer process is the rate-limiting step of the ORR reaction.< Réduire

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Non-cobalt cathode material

Double perovskite

Electrode reaction

Distribution of relaxation times analysis

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Evaluation of La2-xNiMO6-d as cathode for intermediate temperature solid oxide fuel cells

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