Abstract
Rechargeable Direct Carbon Fuel Cells (RDCFC) with Ni/GDC-cermet anodes were developed. RDCFCs with a Ni/GDC (gadolinium-doped ceria) anode and 0.3-mm-thick ScSZ (scandia-stabilized zirconia) electrolyte charged with propane for 5 min at 600° exhibited a stable, maximum power density of 200 mW/cm2 for more than 1 h at operating temperature of 900°. The effect of charging temperature on the properties of charged carbon and on power generation was studied here. When the charging temperature was decreased from 900° to 750°, power generation time increased by more than a factor of 10, from 22 to 280 min. Based on the TG-DTA results, carbon charged at 600° could easily be oxidized, and CO supply by the Boudouard reaction was improved. This led to an improved power density and fuel utilization.
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