A two-dimensional mathematical model based on the macrohomogeneous theory of porous electrodes was developed for a cylindrical Zn-MnO2 alkaline cell. The model was applied to understand the effect of the length of the...A two-dimensional mathematical model based on the macrohomogeneous theory of porous electrodes was developed for a cylindrical Zn-MnO2 alkaline cell. The model was applied to understand the effect of the length of the anode current collector on the cell performance. Results are presented for the continuous discharge at a high rate of 1A and a moderate rate of 0.2A for a AA-sized cell. With a typical length of an anode current collector at about 70%of the cell height, the analysis showed that an increase in the length of the anode current collector would benefit the lower rate of discharge more than the higher rate of discharge.展开更多
Overpotential:η The change of the chemical potential for solid phases is equal to zero as Zn and ZnO are considered as single-component materials.By combining the Ohm’s law in the matrix phase and the chemical poten...Overpotential:η The change of the chemical potential for solid phases is equal to zero as Zn and ZnO are considered as single-component materials.By combining the Ohm’s law in the matrix phase and the chemical potential in the solution phase, the overpotential for the anode can be written展开更多
Surface Overpotential:The driving force of the electrochemical reaction rate is the surface overpote ntial,ηs=η-Uw,ref,where Uw,ref is the potential of an imaginary reference ele ct-rode positioned adjacent to the w...Surface Overpotential:The driving force of the electrochemical reaction rate is the surface overpote ntial,ηs=η-Uw,ref,where Uw,ref is the potential of an imaginary reference ele ct-rode positioned adjacent to the working electrode just beyond the double lay er.Hence,展开更多
文摘A two-dimensional mathematical model based on the macrohomogeneous theory of porous electrodes was developed for a cylindrical Zn-MnO2 alkaline cell. The model was applied to understand the effect of the length of the anode current collector on the cell performance. Results are presented for the continuous discharge at a high rate of 1A and a moderate rate of 0.2A for a AA-sized cell. With a typical length of an anode current collector at about 70%of the cell height, the analysis showed that an increase in the length of the anode current collector would benefit the lower rate of discharge more than the higher rate of discharge.
文摘Overpotential:η The change of the chemical potential for solid phases is equal to zero as Zn and ZnO are considered as single-component materials.By combining the Ohm’s law in the matrix phase and the chemical potential in the solution phase, the overpotential for the anode can be written
文摘Surface Overpotential:The driving force of the electrochemical reaction rate is the surface overpote ntial,ηs=η-Uw,ref,where Uw,ref is the potential of an imaginary reference ele ct-rode positioned adjacent to the working electrode just beyond the double lay er.Hence,
