Abstract
A commercially available glass-ceramic composition is applied on a ferritic stainless steel (FSS) substrate reproducing a type of interface present in solid oxide fuel cells (SOFCs) stacks. Electrochemical impedance spectroscopy (EIS) is used to study the electrical response of the assembly in the temperature range of 380–780 °C and during aging for 250 h at 780 °C. Post-experiment analyses, performed by means of X-ray diffraction (XRD), and along cross-sections by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis, highlight the microstructural changes promoted by aging conditions over time. In particular, progressive crystallization of the glass-ceramic, high temperature corrosion of the substrate and diffusion of Fe and Cr ions from the FSS substrate into the sealant influence the electrical response of the system under investigation. The electrical measurements show an increase in conductivity to 5 × 10−6 S∙cm−1, more than one order of magnitude below the maximum recommended value.
Highlights
Solid oxide fuel cells (SOFCs) constitute one of the most promising technologies for alternative energy production
It is usually fitted using a resistor and a capacitor connected in parallel [34], the semicircle shown in Figure 2 has a depressed shape with the center below the real axis
Conductivity, related the to the long-range migration mobile ions. Both processes were affected by microstructural changes occurring as an effect of aging at solid oxide fuel cells (SOFCs)
Summary
Solid oxide fuel cells (SOFCs) constitute one of the most promising technologies for alternative energy production. Such devices are able to convert the chemical energy stored in a fuel directly to electricity without intermediate steps. Such a reaction is characterized by high efficiency, which can be further increased by partially recovering the exhaust heat. A single cell consists of three essential components: two porous electrodes (i.e., cathode and anode) separated by a thin and dense electrolyte. The state-of-the-art material for the anode is a nickel-YSZ cermet, while the cathode is made of perovskites such as strontium-doped lanthanum manganite (LSM)
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