Reactions of the Carbon Anode in Alternative Battery and Fuel Cell Configurations

[摘要] A model is formulated by combining carbonate dissociation with pre-existing anode mechanisms involving heterogeneous reaction kinetics. The proposed model accounts for both the observed preponderance of CO{sub 2} evolution and dependence of rate on carbon anode microstructure. Implications of the model for the design of carbon batteries and fuel cells are discussed, and the laboratory cells used in earlier research are described. High coulombic efficiencies for the net reaction C + O{sub 2} = CO{sub 2} require severely limiting the thickness of paste anodes in powder-fed fuel cells while the unreacting surfaces of solid prismatic anodes must be isolated from the CO{sub 2} product atmosphere to prevent Boudouard corrosion, according to C + CO{sub 2} = 2CO.

[发布日期] 2003-10-01 [发布机构] Lawrence Livermore National Laboratory

[关键词] 30 Direct Energy Conversion;Corrosion;25 Energy Storage;Dissociation;Anodes