Alloying effects of Pd and Ni on the catalysis of the oxidation of dry CH4 in solid oxide fuel cells

The mechanisms of Ni, Pd and Pd-Ni catalysts in a solid oxide fuel cell (SOFC) were studied to clarify the alloying effects of Pd and Ni on the catalysis for the oxidation of CH4 fuel. Pd-Ni and Pd catalysts loaded on a composite anode of La0.8Sr0.2CrO3 (LSCr) and Ce0.8Sm0.2O1.9 (SDC) show catalytic activity for the oxidation of CH4. The impedance study for these anodes clearly suggests a difference between the reaction mechanisms on the Pd–Ni/and the Pd/LSCr–SDC anodes. The dominant reaction path for the methane activation seems to be a non-electrochemical process on the Pd-Ni catalyst, whereas the activation of CH4 over the Pd catalyst occurs only on electrochemically active sites.

Graphical abstractThe effects of Ni, Pd, and Pd-Ni catalysts on the oxidation of dry CH4 in SOFCs have been investigated in detail. Both Pd/and Pd–Ni/LSCr–SDC anodes show some catalytic activity for the oxidation of CH4, but the reaction mechanisms are different.Figure optionsDownload full-size imageDownload as PowerPoint slide