Study of the synergistic interaction between nickel, gold and molybdenum in novel modified NiO/GDC cermets, possible anode materials for CH4 fueled SOFCs

Authors:  D.K. Niakolas, M. Athanasiou, V. Dracopoulos, I. Tsiaoussis, S. Bebelis, S.G. Neophytides

Abstract:
The present study concerns the structural and physicochemical characterization of novel Au–Mo–NiO/GDC cermets, alongside with measurements of their carbon tolerance. This is an investigation on whether commercially available NiO/GDC powder that is modified with Au and/or Mo can yield possible electrocatalysts as anodes for CH₄ fueled SOFCs. Specifically, the performed preparation methods of deposition-precipitation and deposition-coprecipitation permitted the modification of a commercial electrocatalyst and lead to cermets that exhibit different reaction kinetics for the catalytic dissociation of CH₄ and different performance for CH₄ steam reforming. The most interesting structural findings were observed in the reduced form of the prepared powders, where a bimetallic Ni–Au solid solution is formed in the Au-modified sample. In the ternary composite material a trimetallic Ni–Au–Mo solid solution is formed, which induces a controversial synergistic effect on the sample‘s catalytic performance. On the other hand, the presence of Au compared to Mo shows the best combination of results in terms of structural properties, carbon tolerance and selectivity to the desirable products of H₂ and CO, for the reaction of CH₄ steam reforming.

Keywords:
Ni/GDC
Gold and/or Molybdenum doping
Synergy
CH₄ dissociation
CH₄ Steam reforming
Carbon deposition

Published in: Applied catalysis A: General  (Volume 456, Pages 1-248, 10 April 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Study of the synergistic interaction between nickel, gold and molybdenum in novel modified NiO/GDC cermets, possible anode materials for CH4 fueled SOFCs

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