Werhahn M.G.,TU Munich |
Schneider O.,TU Munich |
Stimming U.,TU Munich |
Stimming U.,Center for Electromobility Singapore
ECS Transactions | Year: 2012
Direct electrochemical conversion of carbon black particles in hydrogen, CO, CO2 and inert gas environments is investigated in a solid oxide direct carbon fuel cell (DCFC). At temperatures ranging from 750-950°C, measurements with a gadolinia doped ceria (GDC) thin film DCFC anode and measurements without this film for comparison are carried out. Direct partial and complete carbon electro-oxidation is observed in contrast to indirect oxidation via carbon gasification and subsequent CO electrooxidation. It was found that the impact of the Boudouard gasification reaction at the anode is insignificant below 800°C for the specific carbon used. The kinetics of the direct carbon oxidation reaction is faster for the cell with the GDC thin film anode than for the cell without, but nonetheless sluggish. Thus the integration of appropriate catalysts into the anode is necessary in the future. © The Electrochemical Society.