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Transition metal sulphide electrocatalytic materials possess the bright overall water-splitting performance of practical electrocatalytic technologies. In this study, an amethyst-like MoS₂@Ni₉S₈/Co₃S₄ rod electrocatalyst was constructed via a one-step hydrothermal method with in-situ-grown ZIF-67 nanoparticles on nickel foam (NF) as a precursor. The rational design and synthesis of MoS₂@Ni₉S₈/Co₃S₄ endow the catalyst with neat nanorods morphology and high conductivity. The MoS₂@Ni₉S₈/Co₃S₄/NF with the amethyst-like rod structure exposes abundant active sites and displays fast electron-transfer capability. The resultant MoS₂@Ni₉S₈/Co₃S₄/NF exhibits outstanding hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) electrocatalytic activities, with low overpotentials of 81.24 mV (HER) at 10 mA cm⁻² and 159.67 mV (OER) at 50 mA cm⁻² in 1.0 M KOH solution. The full-cell voltage of overall water splitting only achieves 1.45 V at 10 mA cm⁻². The successful preparation of the amethyst-like MoS₂@Ni₉S₈/Co₃S₄ rod electrocatalyst provides a reliable reference for obtaining efficient electrocatalysts for overall water splitting.