Proton diffusion determination and dual structure model for nickel hydroxide based on potential step measurements on single spherical beads

Potential step measurement is performed on single beads of spherical nickel hydroxide to determine the proton diffusion coefficient (D) and concentration of the effective proton vacancies (C). The semi-infinite diffusion equation for the initial stage and the finite diffusion equation for the long-term of the current response to potential step are used for deducing the D and C values.