Synthesis and Characterization of High Temperature Properties of YBa2Cu3O6+δ Superconductor as Potential Cathode for Intermediate Temperature Solid Oxide Fuel Cells

(Pages 82-91)

Joaquín Grassi1, Mario A. Macías1,2, Juan F. Basbus3, Jorge Castiglioni4, Gilles H. Gauthier5, Adriana C. Serquis3 and Leopoldo Suescun1

1Cryssmat-Lab/DETEMA, Facultad de Química, Universidad de la República, Montevideo, Uruguay; 2Departamento de Química, Universidad de los Andes, Carrera 1 No 18A-12, Bogotá, Colombia; 3Departamento de Caracterización de Materiales, CAB-INN-CNEA-CONICET, Av. Bustillo 9500, San Carlos de Bariloche, Rio Negro (8400), Argentina; 4Área de Fisicoquímica/DETEMA, Facultad de Química, Universidad de la República, Montevideo, Uruguay; 5Universidad Industrial de Santander, INTERFASE, Bucaramanga, Colombia



Abstract: YBa2Cu3O6+δ (YBC) oxygen deficient perovskite was synthesized by an auto-combustion method and was studied as potential cathode for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC). Synchrotron X-ray thermodiffraction in air shows a phase transition from orthorhombic Pmmm to tetragonal P4/mmm space groups at ~ 425 °C. The chemical compatibility with Ce0.9Gd0.1O1.95 (GDC) electrolyte was investigated in air where certain reactivity was observed above 800 °C. However, the main phase is Ba(Ce1-xYx)O3, a good ionic conductor. The catalytic performance in air was obtained by electrochemical impedance spectroscopy (EIS) measurements on YBC/GDC/YBC symmetrical cells. The area specific resistance (ASR) values change from 13.66 to 0.14 Ω cm2 between 500 and 800 °C, with activation energy (Ea) of 0.41 eV. The results suggest potential applications of YBC as IT-SOFC cathode.

Keywords: YBa2Cu3O6+d perovskite, IT-SOFC, Cathode, Auto-combustion synthesis, Electrochemical performance.