Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

Jian-Wei Liu (1) , Qiang Li (1) , Li-Ping Sun (1) , Li-Hua Huo (1) , Hui Zhao (1) , Jean-Marc. Bassat (2) , Sébastien Fourcade (2) , Jean-Claude Grenier (2)

1 KLFIMC - Key Laboratory of Functional Inorganic Material Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

PrSrCo1-xCuxO4+δ (x = 0.0, 0.1, 0.3, 0.5) are synthesized by solid-state reaction method. The effects of Cu2+ doping on electrical conductivity, thermal expansion, oxygen diffusion properties and oxygen reduction reaction (ORR) activity are investigated. PrSrCo1-xCuxO4+δ oxides crystallize in a single-phase tetragonal structure with I4/mmm space group. Partial substitution Co3+ by Cu2+ results the increase of electrical conductivity and decrease of thermal expansion coefficient. Introducing Cu2+ promotes the formation of interstitial oxygen, accelerates the kinetics of oxygen transport, and significantly improves the electrocatalytic activity of ORR. The lowest area specific resistance (ASR) value of 0.08 Ω cm2 is obtained for the PrSrCo0.7Cu0.3O4+δ cathode at 700 °C in air. The ORR mechanism study demonstrates that Cu-doping (30%) promotes the charge transfer process. The reaction rate control step on PrSrCo0.7Cu0.3O4+δ cathode is the dissociation and surface diffusion process of adsorbed molecular oxygen.

Domaines: Matériaux

Jian-Wei Liu, Qiang Li, Li-Ping Sun, Li-Hua Huo, Hui Zhao, et al.. Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells. Renewable Energy, 2020, 159, pp.486-493. ⟨10.1016/j.renene.2020.06.032⟩. ⟨hal-02885979⟩