A porous three-dimensional (3D) structure was created on the Zn surface by an electrostripping activation process under high current density, which could suppress the non-uniform Zn²⁺ deposition induced by the “tip effect.” Moreover, a functional CeO₄H₄/Ce(OH)₃ passivation layer was introduced to prevent electrochemical corrosion and facilitate electrolyte infiltration. Benefiting from the ingenious 3D structure and passivation layer, the assembled symmetric cell delivers a long lifespan of over 1500 h at 5 mA/cm². Even at 20 mA/cm², the electrode can still operate for over 300 h. The R-Zn@Ce‖MnO₂ full cell exhibits a capacity of 205.3 mA·h/g after 300 cycles at a current density of 0.3 A/g.