New Internal Reforming LaGaO_3 Solid Oxide Fuel Cell Based on Partial Oxidation of CH_4

摘要

A novel solid oxide fuel cell utilizing partial oxidation of methane as an internal reforming reaction was investigated in the present study. Large electric power enough as power generator and synthesis gas consisting of CO and H_2 were simultaneously obtained in the cell using transition metal LaGaO_3 as an electrolyte. The electrical power density as well as CH_4 conversion was improved by doping Co for Ga site. The power density was increased with increasing the amount of Co and attained the maximum when 8.5 mol% Co dope LaGaO_3. The maximum power density of 0.36 W/cm2 was exhibited at 1073 K on the cell using 0.5mm thickness of LSGMC plate. Detail analysis of internal resistance designated the main internal resistance of electrical resistance which is corresponded with that of electrolyte. The maximum power density increased with decreasing thickness of electrolyte and it attained to a value of 0.42 W/cm~2 at 1073 K when the thickness of electrolyte was 0.39 mm. Since carbon formation was hardly observed, simultaneous production of electric power and synthesis gas at H_2/CO=2 became realized by partially oxidized CH_4 with fuel cell using LSGMC for electrolyte.