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This study presents the synthesis of a multicomponent metal oxide electrocatalyst that increases the activity of the oxygen evolution reaction (OER). We synthesized transition metal oxides (MnO_x, FeO_x, CoO_x, and NiO_x) with MoO₃ heterostructures through a solid-state reaction approach at low cost. In comparison to the other compositions, CoO_x garnered higher attention and demonstrated superior performance on account of its large surface area and varied crystal facets. The MnO_x-MoO₃, FeO_x-MoO₃, CoO_x-MoO₃, and NiO_x-MoO₃ compositions attained an overpotential of 390 mV, 350 mV, 310 mV, and 340 mV, respectively, at a current density of 10 mA cm⁻² in alkaline solution. The performance of OER was enhanced in CoO_x-MoO₃ at 10 mA cm⁻², while FeO_x-MoO₃ exhibited a lower current density at 100 mA cm⁻² than other metal oxides. The CoO_x-MoO₃ material exhibited a favorable crystal interface transition due to the presence of MoO₃ oxide. For the first time, we report on the MoO₃-to-(MnO_x, FeO_x, CoO_x, and NiO_x) interface crystal transition and the active surface area for OER catalytic activity in water-splitting processes. This investigation intends to develop an electrocatalyst that is capable of producing hydrogen with the use of heterostructure metal oxides.