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Rational design of the catalysts is impressive for sustainable energy conversion. However, there is a grand challenge to engineer active sites at the interface. Herein, hierarchical transition bimetal oxides/sulfides heterostructure arrays interacting two-dimensional MoO_x/MoS₂ nanosheets attached to one-dimensional NiO_x/Ni₃S₂ nanorods were fabricated by oxidation/hydrogenation-induced surface reconfiguration strategy. The NiMoO_x/NiMoS heterostructure array exhibits the overpotentials of 38 mV for hydrogen evolution and 186 mV for oxygen evolution at 10 mA cm⁻², even surviving at a large current density of 500 mA cm⁻² with long-term stability. Due to optimized adsorption energies and accelerated water splitting kinetics by theory calculations, the assembled two-electrode cell delivers the industrially relevant current densities of 500 and 1000 mA cm⁻² at record low cell voltages of 1.60 and 1.66 …