Feasibility of liquid hydrocarbon fuels for SOFC with Ni-ScSZ anode

FUEL 275

Haruo Kishimoto, haruo-kishimoto@aist.go.jp, Katsuhiko Yamaji, Teruhisa Horita, Yueping Xiong, Natsuko Sakai, Manuel E. Brito, and Harumi Yokokawa, h-yokokawa@aist.go.jp. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), AIST Central 5, Higashi 1-1-1, Tsukuba, 305-8565, Japan
In the present study, the reaction process in the Ni-ScSZ anode of SOFCs with hydrocarbon fuels and feasibility of non-diluted n-dodecane (model fuel for kerosene) for the Ni-ScSZ anode at S/C = 2.0 were examined at 1073 K. Methane was hard to be reformed due to its high thermodynamic stability. On the other hand, hydrocarbon fuels with C3~C12 were immediately reformed on the Ni and resulting gas composition was almost the same. Anode potential under the OCV condition was determined from the oxygen potential governed by the H2-H2O equilibrium. It is clear that the anode reaction process is similar to one for H2 fuel. Stable operation was achieved with non-diluted n-dodecane fuel at about 160 mA/cm2 with anode potential of - 0.75 V for about 50 h without carbon deposition on Ni-ScSZ anode and Ni-mesh.