Metal oxide nanofiber-based electrodes in solid oxide fuel cells

Structural and Catalytic Characterization of La0.6Sr0.4MnO3 Nanofibers for Application in Direct Methane Intermediate Temperature Solid Oxide Fuel Cell Anodes

“…Overall, nanofiber-based electrodes are expected to show better electrochemical performance than common powder ones. The two different architectures were investigated through the electrochemical impedance spectroscopy test (EIS), and the nanofiber-based electrode reported lower polarization resistance [33]. Nevertheless, the structural and microstructural origin of this behavior has, to date, received little attention.…”

Electrochemical Impedance Spectroscopy of Core‐Shell Nanofiber Cathodes, with Ce0.9Gd0.1O1.95 (Core) and Cu‐Doped La0.6Sr0.4MnO3 (Shell), for Application in Solid Oxide Fuel Cells

“…In the LSM perovskite, the La 3 + ion placed in the A-site is substituted with an Sr 2 + ion, leading to the formation of an electric hole, with consequent oxidation of an Mn atom, from Mn 3 + to Mn + 4 . [2,3] Indeed, the Sr-doping significantly increases the electrical conductivity of LaMnO 3 , which is 83 S cm À 1 at 800 °C, reaching 320 S cm À 1 at 800 °C with the La 0.6 Sr 0.4 MnO 3 . [2] Nonetheless, the current trend toward decreasing operating temperature makes it necessary to study more complex electrode architectures and materials, suitable for intermediatetemperature applications.…”

“…The perovskite crystal structure, described with the general formula ABO 3 , can be modified by substituting atoms in the A and B sites, triggering electronic and/or oxygen ion conductivity and electrocatalytic activity. [1][2][3][4] Among all perovskites, strontium-substituted lanthanum manganite (La 1-x Sr x MnO 3 , LSM) is considered the state-of-the-art cathode for high-temperature solid oxide fuel cells (HT-SOFCs). In the LSM perovskite, the La 3 + ion placed in the A-site is substituted with an Sr 2 + ion, leading to the formation of an electric hole, with consequent oxidation of an Mn atom, from Mn 3 + to Mn + 4 .…”

“…[6] For these reasons, nanofiber-based electrodes have demonstrated better results compared to powder-based ones, which are state-of-the-art. [3,[7][8][9] Among all the nanofiber geometries, that of core-shell appears particularly interesting. Core-shell electrospinning can be achieved using a syringe with two coaxial needles, enabling the simultaneous ejection of two different solutions, which results in composite nanofibers with a core material different from the shell.…”

“…Perovskites are versatile metal oxides that have gained wide attention as cathode materials for intermediate‐temperature solid oxide fuel cells (IT‐SOFCs). The perovskite crystal structure, described with the general formula ABO 3 , can be modified by substituting atoms in the A and B sites, triggering electronic and/or oxygen ion conductivity and electrocatalytic activity [1–4] . Among all perovskites, strontium‐substituted lanthanum manganite (La 1‐x Sr x MnO 3 , LSM) is considered the state‐of‐the‐art cathode for high‐temperature solid oxide fuel cells (HT‐SOFCs).…”