Processing improvement and performance analysis of La_0.85Sr_0.15Ga_0.8Mg_0.2O_2.825 electrolyte-supported fuel cells

In this study, La_0.85Sr_0.15Ga_0.8Mg_0.2O_2.825 (LSGM1520), La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF6428), La_0.4Ce_0.6O_1.8 (LDC46), and Ce_0.8Sm_0.2O_1.9 (SDC20) powders were synthesized by the solid-state reaction. Three cell configurations were prepared: LSCF6428/LSGM1520/SDC20-Ni (Cell-A), LSCF6428/LSGM1520/porous LSGM1520/SDC20-Ni (Cell-B), and LSCF6428/LDC46/LSGM1520/LDC46/SDC20-Ni (Cell-C). An LDC46 layer and a porous LSGM1520 layer were used as the buffer and anode functional layers, respectively. The results showed that the LDC46 interlayer effectively reduced the ohmic resistance and electrode polarization resistance, and improved the adhesion between the electrolyte and the electrode, leading to enhanced power performance of the cells. The properties of the electrolyte-supported cells were analyzed by X-ray diffraction and scanning electron microscopy, and the performance was measured by electrochemical instrumentation and AC impedance spectroscopy. Finally, the performance, microstructures, and degradation rates of three cells were measured after 100 h of durability testing.