Reactions of low concentration dry methane at Ni-YSZ anode in the SOFCs

 Dry methane with various concentrations was directly entered the anode of the solid oxide fuel cells (SOFCs) of Ni-YSZ/YSZ/LSM（Ni-Y₂O₃ stabilized ZrO/YSZ/La₀.85Sr₀.15MnO₃-δ）. The exhaust gases from anode were measured in-situ by gas chromatograph (GC) to study the reactions of dry methane under different current densities at the Ni-YSZ anodes. The reactions were determined by comprising the theoretical open-circuit voltage (OCV) to the measured one, analyzing quantitatively the exhaust gas and the activation energy of elementary reactions occurred to CH₄ at the Ni-YSZ anodes. At 1000℃ oxidation of methane was found to take place in sequence from partial oxidation, CH₄+2O²- → CO+H₂O+H₂+4e^-， CH₄+3O²- → CO+2H₂O+6e^- to complete oxidation with increasing current density at the Ni-YSZ anodes under 3.85% and 5.66% CH₄ conditions.