SHI Ruxin ¹, WAN Lixin ¹, SHI Huangang ², SUN Liangliang ³

(1. Changzhou Power Supply Branch, State Grid Jiangsu Electric Power Co., Ltd., Changzhou 213003, Jiangsu, China; 2. School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China; 3. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)

Abstract: Cu²⁺doped Pr₂NiO₄ cathode materials were prepared by using EDTA-citric acid combined complexation method and the electrochemical performance of the materials in solid oxide fuel cells (SOFC) was studied. The doping of Cu²⁺ reduced the conductivity of the materials at the operating temperature of SOFC. After high-temperature sintering, the cathode layer was adhered to the surface of the electrolyte, forming a porous structure. In the symmetrical cells, the cathode polarization resistance of Pr₂Ni_0.8Cu_0.2O₄ was the smallest on the electrolyte of Ce_0.8Sm_0.2O_1.9 (SDC). At 600 ℃, the polarization resistance of the Pr₂Ni_0.8Cu_0.2O₄ in the symmetrical cell was 0.68 Ω·cm² and the electrode resistance in the SDC electrolyte single cell was less than 0.48 Ω·cm². The peak power density of the single cell with Pr₂Ni_0.8Cu_0.2O₄ cathode reached 422 mW·cm^-2.

Key words: solid oxide fuel cell; Pr₂NiO₄; doping; power density