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4185493 
Journal Article 
Direct methane solid oxide fuel cells based on catalytic partial oxidation enabling complete coking tolerance of Ni-based anodes 
Lee, D; Myung, J; Tan, J; Hyun, SH; Irvine, JTS; Kim, J; Moon, J 
2017 
Yes 
Journal of Power Sources
ISSN: 0378-7753 
Elsevier 
345 
Elsevier 
30-40 
WOS:000397355500004 
Solid oxide fuel cells (SOFCs) can oxidize diverse fuels by harnessing oxygen ions. Benefited by this feature, direct utilization of hydrocarbon fuels without external reformers allows for cost-effective realization of SOFC systems. Superior hydrocarbon reforming catalysts such as nickel are required for this application. However, carbon coking on nickel-based anodes and the low efficiency associated with hydrocarbon fueling relegate these systems to immature technologies. Herein, we present methane fueled SOFCs operated under conditions of catalytic partial oxidation (CPDX). Utilizing CPDX eliminates carbon coking on Ni and facilitates the oxidation of methane. Ni-gadolinium-doped ceria (GDC) anode-based cells exhibit exceptional power densities of 1.35 W cm(-2) at 650 C and 0.74 W cm(-2) at 550 degrees C, with stable operation over 500 h, while the similarly prepared Ni-yttria stabilized zirconia anode based cells exhibit a power density of 0.27 W cm(-2) at 650 degrees C, showing gradual degradation. Chemical analyses suggest that combining GDC with the Ni anode prevents the oxidation of Ni due to the oxygen exchange ability of GDC. In addition, CPDX operation allows the usage of stainless steel current collectors. Our results demonstrate that high-performance SOFCs utilizing methane CPDX can be realized without deterioration of Ni-based anodes using cost-effective current collectors. (C) 2017 Elsevier B.V. All rights reserved. 
Solid oxide fuel cell; Methane fueling; Ni catalyst; Catalytic partial oxidation; Oxygen exchange kinetics