Artículo
Optimising anode supported BaZr1-xYxO3-δ electrolytes for solid oxide fuel cells: Microstructure, phase evolution and residual stresses analysis
Autor/es | Fernández Muñoz, Sol
Chacartegui, Ricardo Alba Rodríguez, María Desirée Ramírez Rico, Joaquín |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Energética Universidad de Sevilla. Departamento de Construcciones Arquitectónicas II (ETSIE) Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2024-03 |
Fecha de depósito | 2024-02-07 |
Publicado en |
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Resumen | Yttrium-doped BaZrO3 is a promising electrolyte for intermediate-temperature protonic ceramic fuel cells. In the anode-supported configuration, a slurry containing the electrolyte is deposited on the surface of a calcined ... Yttrium-doped BaZrO3 is a promising electrolyte for intermediate-temperature protonic ceramic fuel cells. In the anode-supported configuration, a slurry containing the electrolyte is deposited on the surface of a calcined porous anode and sintered. Differences in sintering behaviour and thermal expansion coefficients for the anode and electrolyte result in elastic residual stresses that can impact the long-term stability of the cell during cyclic operation. Half-cells using BaZr0.8Y0.2O3-δ as the electrolyte were fabricated using the solid-state reaction sintering method under various sintering conditions. Comprehensive microstructure and residual stress analyses as a function of processing parameters were performed using two-dimensional X-ray diffraction, Rietveld refinement, and scanning electron microscopy, before and after the half-cells were reduced under hydrogen, giving a complete picture of phase, microstructure, and stress evolution under thermal and reduction cycles like the actual operation of the cell. Our results reveal that a temperature of 1400 °C and shorter soaking times might be advantageous for obtaining phase-pure and thin yttrium-doped BaZrO3 electrolytes with improved microstructure and the presence of compressive residual stress. These findings offer valuable insights into optimising the fabrication process of BaZrO3-based electrolytes, leading to enhanced performance and long-term stability of anode-supported protonic ceramic fuel cells operating at intermediate temperatures. |
Agencias financiadoras | Spanish Ministry of Science and Innovation co-financed with FEDER funds under Grant no. PID2019-107019RB-I00 |
Identificador del proyecto | PID2019-107019RB-I00 |
Cita | Fernández Muñoz, S., Chacartegui, R., Alba Rodríguez, M.D. y Ramírez Rico, J. (2024). Optimising anode supported BaZr1-xYxO3-δ electrolytes for solid oxide fuel cells: Microstructure, phase evolution and residual stresses analysis. Journal of Power Sources, 596 (234070). https://doi.org/10.1016/j.jpowsour.2024.234070. |
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