Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Abstract

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Microstructure and Electrical Properties of Fe,Cu Substituted (Co,Mn)3O4 Thin Films

“…These effects have been reported previously for similar spinel compositions [11,24]. One possible explanation is a change in the prevailing conduction mechanism.…”

“…Crystallites grow from the initial~6 nm to~25 nm after processing at 800 • C. The Initial crystallite size is similar to the one observed previously by SEM in a similar system where MnCo 2 O 4 precursors were impregnated into an MnCo 2 O 4 matrix [11].…”

“…Materials based on MnCo 2 O 4 are interesting for a broad range of applications, from room temperature to high temperatures (800 • C). They can be used in Li-ion battery electrodes [6,7], electrochemical supercapacitors [8] and as coating materials for steel interconnects for fuel cells [9][10][11]. The microstructure and the composition of the spinel strongly affect its performance and applicability in a specific technology.…”

Evaluation of electrodeposited Mn‐Co protective coatings on Crofer 22 APU steel

“…They differ more visibly at the high temperature range, between 0.73 eV and 0.88 eV (~20% variation). Several authors have reported a change in the slope of the conductivity of the spinel materials, also when used on the alloys . Activation energy of the oxidized alloys is depending on the properties of not only the coatings, but also on the properties of the thermally grown chromia layer and other possible reaction layers, which due to its low electronic conductivity and high activation energies dominates the scale resistance.…”

“…Among the materials, Mn‐Co spinels have been proposed as being very effective in reducing chromium evaporation . Usually used spinel composition is Mn 1.5 Co 1.5 O 4 or MnCo 2 O 4, but also pure Co 3 O 4 has been tested . Studies about the properties of different Co/Mn compositions are scarce …”