Performance optimization of metal-supported solid oxide fuel cells using cathode and full cell impregnation with La0.4Sr0.6Co0.2Fe0.7Nb0.1O3−δ electrode

Abstract

In this study, precursor solutions of La_0.4Sr_0.6Co_0.2Fe_0.7Nb_0.1O_3−δ (LSCFN) symmetric electrode were prepared, and the applications of cathode impregnation and full cell impregnation in the preparation and performance optimization of four-layer metal-supported solid oxide fuel cells (MSCs) were thoroughly investigated. Test results indicate that the polarization impedance of cathode impregnated MSCs under H₂ and CH₄ atmospheres at 750 °C is approximately 0.1 Ω cm² and 0.41 Ω cm², respectively, with power densities of 1115 mW cm⁻² and 700 mW cm⁻², respectively. Meanwhile, the polarization impedance of full cell impregnated MSCs under the same conditions is 0.12 Ω cm² and 0.40 Ω cm², with power densities of 945 mW cm⁻² and 840 mW cm⁻², respectively. Remarkably, MSCs full cell impregnated LSCFN exhibit outstanding stability performance under CH₄ atmosphere in a 100 h stability test. Research on the application of impregnation method for performance optimization of metal-supported cells is relatively scarce. The results reveal the feasibility of simplifying MSCs preparation steps using full cell impregnation method, further promoting the widespread application of metal-supported overall cells.