Spinel-based coatings for metal supported solid oxide fuel cells

Abstract

Graphical abstract2 Highlights  A successful method of solution infiltration is used for coating porous metals.  Continuous spinel coatings were successfully prepared on porous metal scaffolds.  Traces of Si favoured infiltration of aqueous solutions and forming spinel coatings. AbstractMetal supports and metal supported half cells developed at DTU are used for the study of a solution infiltration approach to form protective coatings on porous metal scaffolds. The metal particles in the anode layer, and sometimes even in the support may undergo oxidation in realistic operating conditions leading to severe cell degradation. Here, a controlled oxidation of the porous metal substrate and infiltration of Mn and/ or Ce nitrate solutions are applied for in situ formation of protective coatings. Our approach consists of scavenging the FeCr oxides formed during the controlled oxidation into a continuous and well adhered coating. The effectiveness of coatings is the result of composition and structure, but also of the microstructure and surface characteristics of the metal scaffolds.

Oxidation of porous stainless steel supports for metal-supported solid oxide fuel cells

“…Development of alternative denser coatings for porous stainless steel may be necessary, and this has already been pursued by other groups [10,17].…”

“…The deposition of coatings throughout the porous structure improved the oxidation rate in both air and fuel atmospheres in the temperature range of 600 to 900 °C. Coating with Y, La, La0.2Sr0.8Ti0.9Ni0.1O3-δ (LSTN), La(Mn,Co)-oxide (LMC), Mn-oxide, or LaCrO3 [10,[14][15][16][17][18][19][20] decreased mass gain rate by approximately 80%. LMC decreased mass gain by three orders of magnitude during exposure to humidified hydrogen at 600 °C -a condition at which the uncoated baseline alloy displayed breakaway oxidation [20].…”

“…Sintered stainless steels have also been preoxidized to form a continuous protective scale before or during coating application. The surface of pristine sintered stainless steel is hydrophobic [17]; pre-oxidation converts the surface to a hydrophilic oxide, which assists in uniformly covering the interior surface in the case of aqueous coating precursor solutions. Pre-oxidation with no additional coating is also effective in reducing the oxidation rate [20], presumably due to the formation of a continuous protective scale at high processing temperatures that persists at the operating conditions.…”

Obtaining Mn-Co Alloys in AISI 430 Steel from Lithium-Ion Battery Recycling: Application in SOFC Interconnectors

“…As an alternative to chromium poisoning, several technologies have been studied including modification of steel composition [14,15], surface treatments [18] and application of protective coatings [7][8][9][19][20][21]. Application of protective coatings is a simple, efficient and cheaper method that inhibits the phenomenon of chromium poisoning and maintains a good specific electrical resistance.…”

Assembling Co9S8 nanoflakes on Co3O4 nanowires as advanced core/shell electrocatalysts for oxygen evolution reaction

“…However, their high cost, scarcity and compromised stability severely hinder their widespread applications in OER [9][10][11] . To overcome these headwinds and achieve exceptional catalytic performance, it is urgent to explore high-performance cost-effective electrocatalysts such as metal oxides [12][13][14] , phosphides [15] , nitrides [16] , selenides and sulfides [17] .…”