Abstract
In this paper, thin perovskite layers between cathode material of solid oxide fuel cells and gadolinia-doped ceria buffer layer are investigated. Thin layers made of LaNi0.6Fe0.4O3-δ (LNF), La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), or SrTi0.65Fe0.35O3-δ (STF) were symmetrically deposited by spin coating method from metallo-organic polymer precursors on a Ce0.8Gd0.2O2-δ (CGO) substrate. Porous and about 40-μm-thick LNF cathodes were deposited on both sides of the substrate and sintered at 1100 °C. Different thicknesses of the thin perovskite layer were investigated in order to find the most effective one and to better understand its influence on the cathode/electrolyte interface. It was found that approximately 150 nm LNF or LSCF layer is sufficient to minimize interface resistance and improve cathode reproducibility. It was concluded that the thin perovskite layer increases contact area and improves the oxygen ion transport between the cathode and electrolyte without influencing the oxygen reduction reaction mechanism.
Highlights
Fuel cells are devices that directly convert chemical energy into electricity
Thin perovskite layers spin coated on CGO substrates without depositing LNF cathode were investigated using XRD analysis in order to analyze their structure
The XRD measurements proved that LNF, LSCF, and STF films have the same crystallographic structure as bulk materials
Summary
Fuel cells are devices that directly convert chemical energy into electricity. As a result, they are not limited by theA. In order to evaluate the cathode/buffer layer interface, symmetrical cells with two LNF electrodes were prepared on a gadolinia-doped ceria (CGO) substrate.
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