Investigation of Pr2NiMnO6‐Ce0.9Gd0.1O1.95 composite cathode for intermediate-temperature solid oxide fuel cells

Huan Li (1) , Li-Ping Sun (1) , Qingmao Feng (1) , Li-Hua Huo (1) , Hui Zhao (1) , Jean-Marc. Bassat (2) , Aline Rougier (2) , Sébastien Fourcade (2) , Jean-Claude Grenier (2)

1 Heilongjiang University [Harbin]
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The electrochemical performance of Pr2NiMnO6 (PNMO)-xCe0.9Gd0.1O1.95 (CGO) (x = 0–40 wt%) composite oxides as intermediate-temperature solid oxide fuel cell (IT-SOFC) cathode materials are evaluated. The electrochemical impedance spectroscopy (EIS) analysis results identify two consecutive electrode processes on the composite cathode. Among the various composites, PNMO-30CGO cathode exhibits the best electrochemical performance with the minimum polarization resistance of 0.23 Ω cm2 and the maximum exchange current density of 75 mA cm−2 at 700 °C in air. These values are almost constant even after 30-h operation. The oxygen reduction reaction (ORR) mechanism studies prove that the major rate-determining step is the charge-transfer process. Introducing CGO significantly improves the charge-transfer process, by increasing the triple phase boundary (TPB) length and oxygen vacancy concentration in the composite cathode.

Mots clés: Solid oxide fuel cells; Double perovskite; Composite cathode; Oxygen reduction reaction mechanism

Domaines: Matériaux

Huan Li, Li-Ping Sun, Qingmao Feng, Li-Hua Huo, Hui Zhao, et al.. Investigation of Pr2NiMnO6‐Ce0.9Gd0.1O1.95 composite cathode for intermediate-temperature solid oxide fuel cells. Journal of Solid State Electrochemistry, 2017, 21 (1), pp.273-280. ⟨10.1007/s10008-016-3364-7⟩. ⟨hal-01441478⟩