Study On Anode Of Tubular Cathode-supported Direct Carbon Fuel Cell

Direct carbon fuel cell（DCFC）is a power generation device using solid carbon as fuel.It has the advantages of high theoretical conversion efficiency,wide fuel sources,and low pollutant emissions.The solid oxide direct carbon fuel cell（SO-DCFC）is the most advantageous type of DCFC,but usually shows lower performance,which greatly limits its practical application.The key to solving this problem is to increase the reaction rate of the anode.The anode of SO-DCFC is mostly based on the solid oxide fuel cell（SOFC）porous anode,However,due to the limited contact area of carbon fuel and anode,the reactivity of the fuel is reduced.In order to enhance the reaction activity of solid carbon fuel at the anode and improve the electrochemical performance of the battery,this paper has done the following research:1.The cathode-supported tubular cell was prepared by the impregnation method.The physical and chemical properties of graphite,carbon black,and carbon black containing 5%Fe catalyst were characterized.Performance tests using graphite,carbon black,and carbon black with 5%Fe catalyst as cell fuels,and it was found that:the properties of the fuel would affect its reactivity at the anode.The greater the porosity and specific surface area of the fuel,the better the performation was.In addition,the catalyst can significantly improve the performance of SO-DCFC.2.The effect of porosity of SO-DCFC anode on cell performance was studied.We prepared a series of tubular SOFCs with different anode porosity,and performance was tested using carbon black located Fe as the fuel.It was found that with the increase of the content of pore-forming agent in the slurry,the performance of SO-DCFC increased and decreased first.When the content of pore-forming agent in anode slurry was 10.7%,the performance of SO-DCFC was the best.The maximum power density is 378 m W·cm^-2 when carbon black located Fe is used as the fuel at 850 ℃.3.Cu-CeO₂ have a catalytic effect on the electrochemical oxidation of solid carbon.Ce and Cu ions are impregnated on the porous yttrium oxide stabilized zirconia（8YSZ）framework as the anode of the cell.The influence of the amount of Cu O-CeO₂ impregnation on the performance of SO-DCFC was studied.It was found that with the increase of the amount of impregnation,the electrochemical performance of SO-DCFC increased first and then decreased.The best performance is when the mass ratio of YSZ to Cu O-CeO₂ is 4:1.The maximum power density at 850 ℃ is 199 m W·cm^-2.