Homotopy perturbation method for the solution of the electrostatic potential differential equation

This paper obtains an explicit analytical solution for nonlinear Poisson‐Boltzmann equation by the homotopy perturbation method, which does not require a small parameter in the equation under study, so it can be applied to both the weakly and strongly nonlinear problems. The obtained results show the evidence of the usefulness of the homotopy perturbation method for obtaining approximate analytical solutions for nonlinear equations.