Materials Today Energy | 2021
Vacuum cold sprayed nanostructured La0.6Sr0.4Co0.2Fe0.8O3−δ as a high-performance cathode for porous metal-supported solid oxide fuel cells operating below 600 °C
Abstract
Abstract Porous metal-supported solid oxide fuel cells (PMS-SOFCs) demonstrate potential to dramatically reduce their costs while simultaneously enhancing the durability of SOFCs. However, owing to the unsatisfactory performance improvement of PMS-SOFCs at low temperatures and available fabrication processes, their commercial applications are limited. In this study, exceptional performance of PMS-SOFCs for electricity generation at low temperatures (400–600\xa0°C) with vacuum cold sprayed (VCS) nanostructured La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) as the high-activity cathode, the plasma-sprayed Ce0.8Gd0.2O2−δ/La0.8Sr0.2Ga0.8Mg0.2O3−δ (GDC/LSGM) bilayer as the electrolyte, and a cermet consisting of the nickel–gadolinium-doped-ceria (Ni–GDC) composite as the anode. By carefully controlling the spray particle size, a nanostructured LSCF cathode is obtained, and the oxygen reduction reaction (ORR) is activated. Consequently, the microstructurally optimized cell exhibits remarkable peak power densities of >1\xa0W/cm 2\xa0at 600\xa0°C and >0.2\xa0W/cm2 \xa0at 450\xa0°C. Moreover, this nanostructured cathode maintains high activity over 1000\xa0h at 550\xa0°C due to the stable microstructure , strontium (Sr) surface segregation, and the exceptional stability of PMS-SOFCs. Our results demonstrate a simple route to dramatically improve the performance and stability of PMS-SOFCs operating at low temperatures by using a nanoscale cathode for activity toward the ORR.