A two-dimensional mathematical model of a Zn-MnO_2 alkaline cell(3)

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

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 as