Nobuaki SUZUKI
Effect of the TiO2 doping to the CeO2-based cermet anode for the direct oxidation of methane
Kazunori SATO
An improvement of the CeO2-based cermet anode has been investigated for the direct utilization of methane in solid oxide fuel cells (SOFCs). Direct utilization of methane for SOFCs causes the methane pyrolysis reaction in the high temperature range leading to the carbon deposition to the surface of a metallic nickel with a decrease in the cell performance. To solve this problem, YSZ (Yttria-Stabilized Zirconia) or SDC (Samaria-Doped Ceria) was used as the electrolyte. CeO2, a high electronic conduction conductor was used as a matrix component of the anode and TiO2 was used as an additive. It was found that the electric conductivity was improved by the TiO2 doping to CeO2. The electrocatalytic activity of Ni/CeO2 and Ni/CeO2-TiO2 (20 mol% Ti) cermet anodes were examined under the oxidation of methane.
The Ni/CeO2-TiO2 anode showed a higher power density than that Ni/CeO2 for the SDC electrolyte. The microstructural characterization of these cermet anodes revealed an improvement of interparticle sinterability by doping Titania on the electrochemical oxidation of CH4. This change of electrode structure effect reduced the DC resistance and increased the polarization resistance. The activation energy is unchanged by doping Titania. Therefore, it was found that the performance was improved by the TiO2 doping.
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