Synthesis and characterization of NiO / GDC e GDC dual nanocomposite powders for high-performance methane fueled solid oxide fuel cells

GDC (gadolinium-doped ceria) is well known as a high oxygen ionic conductor and is a catalyst for the electrochemical reaction with methane fuel leading to the oxidation of deposited carbon that can clog the pores of the anode and break the microstructure of the anode. NiO/GDCeGDC dual nano-composite powders were synthesized by the Pechini process, which were used as an AFL (anode functional layer) or anode substrates along with a GDC electrolyte and LSCFeGDC cathode. The anodes, AFL, and electrolyte were fabricated by a tape-casting/lamination/co-firing. NiOeGDC anode and NiO/GDCeGDC anode-supported unit cells were evaluated in terms of their power density and durability. As a result, the NiO/GDCeGDC dual nano-composite demonstrated an improved power density from 0.4 W/cm to 0.56 W/cm with H2 fuel/air and from 0.3 W/cm 2 to 0.56 W/cm with CH4 fuel/air at 650 C. In addition, it could be operated for over 500 h without any degradation with CH4 fuel. Copyright a 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights

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