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Development of plasma-sprayed molybdenum carbide-based anode layers with various metal oxides for SOFC.

Faisal, N.H.; Ahmed, R.; Katikaneni, P.; Souentie, S.; Goosen, M.F.A.

Authors

N.H. Faisal

R. Ahmed

P. Katikaneni

S. Souentie

M.F.A. Goosen



Abstract

Air plasma-sprayed (APS) coatings provide an ability to deposit a range of novel fuel cell materials at competitive costs. This work develops three separate types of composite anodes (Mo-Mo2C/Al2O3, Mo-Mo2C/ZrO2, Mo-Mo2C/TiO2) using a combination of APS process parameters on Hastelloy{reg}X for application in intermediate temperature proton-conducting solid oxide fuel cells. Commercially available carbide of molybdenum powder catalyst (Mo-Mo2C) and three metal oxides (Al2O3, ZrO2, TiO2) was used to prepare three separate composite feedstock powders to fabricate three different anodes. Each of the modified composition anode feedstock powders included a stoichiometric weight ratio of 0.8:0.2. The coatings were characterized by scanning electron microscopy, energy dispersive spectroscopy, x-ray diffraction, nanoindentation, and conductivity. We report herein that three optimized anode layers of thicknesses between 200 and 300 {aelig}m and porosity as high as 20% for Mo-Mo2C/Al2O3 (250-{aelig}m thick) and Mo-Mo2C/TiO2 (300 {aelig}m thick) and 17% for Mo-Mo2C/ZrO2 (220-{aelig}m thick), controllable by a selection of the APS process parameters with no addition of sacrificial pore-forming material. The nanohardness results indicate the upper layers of the coatings have higher values than the subsurface layers in coatings with some effect of the deposition on the substrate. Mo-Mo2C/ZrO2 shows high electrical conductivity.

Journal Article Type Article
Publication Date Dec 31, 2015
Journal Journal of thermal spray technology
Print ISSN 1059-9630
Electronic ISSN 1544-1016
Publisher Springer (part of Springer Nature)
Peer Reviewed Peer Reviewed
Volume 24
Issue 8
Pages 1415-1428
Institution Citation FAISAL, N.H., AHMED, R., KATIKANENI, S.P., SOUENTIE, S. and GOOSEN, M.F.A. 2015. Development of plasma-sprayed molybdenum carbide-based anode layers with various metal oxides for SOFC. Journal of thermal spray technology [online], 24(8), pages 1415-1428. Available from: https://doi.org/10.1007/s11666-015-0315-2
DOI https://doi.org/10.1007/s11666-015-0315-2
Keywords Air plasma spray; Anode; Molybdenum carbide; SOFC

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