The effects of halide ions (F⁻, Cl⁻, Br⁻, or I⁻) on nanoporous Zn-based electrocatalysts were assessed. All catalysts in the presence of halides exhibited high electrocatalytic performances of CO₂ reduction reaction (CO₂RR) and efficient suppression of hydrogen evolution reaction (HER) with a maximum Faradaic efficiency of up to 97%. The increasing adsorption strength from F⁻ to I⁻ is proposed to form more porous structures and higher oxidized Zn species, thus facilitating the protonation of CO₂ and stabilizing the adsorbed intermediates induced by charge donation from the adsorbed halides on Zn surface to CO₂, enhance CO₂RR and simultaneously suppress HER.