2016 Volume 95 Issue 10 Pages 922-929
Ni-CeO2 nano-composite particle was applied to electrode catalyst for anode of a single cell, and anode deterioration by trace tar in fuel gas was evaluated in this paper. CeO2 addition to Ni was effective to suppress carbon deposition. When fuel gas was contaminated by toluene, the voltage drop and recovery cycle was observed several times during the power generation experiments, and then Ni content at the surface of the anode decreased. However, to increase CeO2 content in electrode catalyst was effective to suppress the frequency of the cycle and the decrease of Ni content from the surface. This implies that CeO2 controls anode deterioration by trace tar since steam reforming of toluene is enhanced by the synergetic effect of Ni and CeO2. In the case of toluene content: 20 g/Nm3 in the model fuel gas and CeO2 content: 20 mol.% in the electrode catalyst, the voltage between the anode and the reference electrode was stable for ten hours and the decrease of Ni content from the surface was not observed. Therefore, Ni-CeO2 nano-composite electrode catalyst has potential to be electrode catalyst for solid oxide fuel cell fueled by biomass gasification gas.