Anode Fluidization of a Liquid Tin Anode SOFC Operated on Simulated Syngas

摘要

Liquid tin has been widely employed as anodes in SOFCs to digest carbonaceous fuels. However, formation of a SnO_2 blocking film at electrochemical reactive sites hinders further electrochemical reaction and impedes steady power generation of fuel cell system. Here we managed to suppress the formation of isolating SnO_2 film by anode fluidization. Tubular LTA-SOFC has been fabricated and tested in present work. Fuels (H_2 and simulated syngas with different H_2/CO ratios) are supplied to the electrochemical reactive interface between the anode and the electrolyte via a manner of anode fluidization. SnO_2 formed in anode was reduced by H_2 when the SOFC was discharged at a constant potential of 0.45V, and anode fluidization increased the fuel cell's power density by 50%. We anticipate that anode fluidization in this study will principally simplify the configuration of liquid tin anode SOFC and maintain the stable operation of the fuel cell system.