Highly Conductive Fe-Doped (La,Sr)(Ga,Mg)O3−δ Solid-State Membranes for Electrochemical Application

Abstract

Membranes based on complex solid oxides with oxygen-ionic conductivity are widely used in high-temperature electrochemical devices such as fuel cells, electrolyzers, sensors, gas purifiers, etc. The performance of these devices depends on the oxygen-ionic conductivity value of the membrane. Highly conductive complex oxides with the overall composition of (La,Sr)(Ga,Mg)O3 have regained the attention of researchers in recent years due to the progress in the development of electrochemical devices with symmetrical electrodes. In this research, we studied how the introduction of iron cations into the gallium sublattice in (La,Sr)(Ga,Mg)O3 affects the fundamental properties of the oxides and the electrochemical performance of cells based on (La,Sr)(Ga,Fe,Mg)O3. It was found that the introduction of iron leads to an increase in the electrical conductivity and thermal expansion in an oxidizing atmosphere, while no such behavior was observed in a wet hydrogen atmosphere. The introduction of iron into a (La,Sr)(Ga,Mg)O3 electrolyte leads to an increase in the electrochemical activity of Sr2Fe1.5Mo0.5O6−δ electrodes in contact with the electrolyte. Fuel cell studies have shown that, in the case of a 550 µm-thick Fe-doped (La,Sr)(Ga,Mg)O3 supporting electrolyte (Fe content 10 mol.%) and symmetrical Sr2Fe1.5Mo0.5O6−δ electrodes, the cell exhibits a power density of more than 600 mW/cm2 at 800 °C.

Sintering Aid Strategy for Promoting Oxygen Reduction Reaction on High-Performance Double-Layer LaNi0.6Fe0.4O3–δ Composite Electrode for Devices Based on Solid-State Membranes

“…The La 0.85 Sr 0.15 Ga 0.85 Mg 0.15 O 3–δ electrolyte (hereafter LSGM) was prepared by the ceramic route using La 2 O 3 , SrCO 3 , MgO, and Ga 2 O 3 as initial components [ 35 ]. The synthesis was carried out in three stages with intermediate grinding of the powder in a PM 100 planetary mill.…”

The Effect of Ga Incorporation in TiO2/SnO2 Nanoparticle‐Decorated Hierarchical ZSM‐5 Composite as Precious‐Metal‐Free Electrocatalysts for Oxygen Electro‐Reduction

“…There are a few reports on Ga in ORR. However, Ga was used in many applications from photocatalysis to conductive membrane preparations [21–23] . Ga was used alongside aluminium as fillers to induce conductivity in polysulfone membranes.…”

“…However, Ga was used in many applications from photocatalysis to conductive membrane preparations. [21][22][23] Ga was used alongside aluminium as fillers to induce conductivity in polysulfone membranes. A continuous network which channels electron transportation was created, reducing the resistivity of the membrane.…”

Recent Advances in Novel Compositions for Electrochemical Applications

“…In recent years, there has been a significant rise in innovative developments in the field of electrochemical composites [1][2][3][4]. These developments have focused on both organic [5][6][7] and inorganic compounds [8][9][10][11][12], including coordination polymers [13][14][15][16].…”