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Journal of Thermal Spray Technology

, Volume 24, Issue 8, pp 1415–1428 | Cite as

Development of Plasma-Sprayed Molybdenum Carbide-Based Anode Layers with Various Metal Oxides for SOFC

  • N. H. FaisalEmail author
  • R. Ahmed
  • S. P. Katikaneni
  • S. Souentie
  • M. F. A. Goosen
Peer Reviewed

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®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 µm and porosity as high as 20% for Mo-Mo2C/Al2O3 (250-µm thick) and Mo-Mo2C/TiO2 (300 µm thick) and 17% for Mo-Mo2C/ZrO2 (220-µm 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.

Keywords

air plasma spray (APS) anode molybdenum carbide SOFC 

Notes

Acknowledgments

This work has been supported by the project titled “Advance anode materials for direct hydrocarbon proton conducting solid oxide fuel cell (PC-SOFC) in auxiliary power unit,” funded by Saudi Aramco (Contract Number 6000074197).

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Copyright information

© ASM International 2015

Authors and Affiliations

  1. 1.School of EngineeringRobert Gordon UniversityAberdeenUK
  2. 2.College of EngineeringAlfaisal UniversityRiyadhSaudi Arabia
  3. 3.School of Engineering and Physical SciencesHeriot-Watt UniversityEdinburghUK
  4. 4.Research & Development CenterSaudi AramcoDhahranSaudi Arabia
  5. 5.Office of Research & Graduate StudiesAlfaisal UniversityRiyadhSaudi Arabia

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