(453a) NiMo-Ceria-Zirconia Anode for Direct Gasoline-Fed Solid Oxide Fuel Cells

Ha, S., Washington State University
Hou, X., washington State university
Zhao, K., Washington State University
Bkour, Q., Washington State University
Norton, M. G., Washington State University

anode for direct gasoline-fed solid oxide fuel cells

Xiaoxue Houa,
Kai Zhaoa, Qusay Bkoura, M. Grant Nortonb*, Su

aVoiland School of Chemical Engineering
and Bioengineering, Washington State University,
Pullman, WA, 99164, USA

of Mechanical and Materials Engineering, Washington
State University,
Pullman, WA, 99164, USA

* E-mail: suha@wsu.edu

To operate the Ni-based Solid Oxide Fuel Cells
(SOFCs) by feeding gasoline, the complex hydrocarbon needs to be reformed into
a simple synthesis gas (a mixture of hydrogen and carbon monoxide) for the
anode electrochemical oxidation reaction. In our previous research, a
NiMo-ceria-zirconia catalyst was found to show high reforming activity with a
coking resistance towards partial oxidation of model gasoline. When this
catalyst was applied as an internal reforming layer over the conventional
Ni-YSZ anode of SOFCs, the single cell displayed significantly improved initial
power density and performance stability under the direct isooctane/air mixture
feed condition. In addition to the high reforming activity, the
NiMo-ceria-zirconia can conduct both electrons and ions. Hence, the
NiMo-ceria-zirconia is expected to provide a dual-functionality for single
anode layer SOFCs: firstly to internally convert complex hydrocarbons into
synthesis gas with a high resistance to coking and secondly to
electrochemically oxidize the synthesis gas mixture for an electric power

Fig. 1 Schematic diagram
of SOFC single cell with the single layer anode.

In this work, we fabricated an
electrolyte-supported SOFC (shown in Fig. 1) using a NiMo-ceria-zirconia single
anode layer and investigated its performance under the direct isooctane/air
mixture feed condition. We found that the addition of Mo to the
Ni-ceria-zirconia significantly suppresses carbon deposition in the anode and
improves the lifetime of the single cell. Additionally, the presence of Mo in
the Ni-ceria-zirconia anode appears to facilitate a higher degree of sintering,
which increases the electronic conductivity and maximum power density of the
single cell. Consequently, at 800 degree C the single cell using 5 wt.% Mo in
the Ni-ceria-zirconia anode displayed a higher maximum power density of 212 mW
cm-2 at 0.48V than the single cell using the Ni-YSZ anode without
the Mo promoter (49 mW cm-2 at 0.48 V) under the isooctane/air
operation mode. Furthermore, the cell presented stable electrochemical
performance with a high coking resistance over 30 h operation using the model
gasoline. These promising results suggest the future application potential of
the NiMo-ceria-zirconia as single layer anode for SOFCs running on complex
hydrocarbon fuels.