The sluggish mechanism of oxygen evolution reaction (OER) inhibits the efficiencies of different energy storage systems. Thus, recent studies have mainly focused on designing highly active electrocatalysts to enhance OER. Here, a porous microsphere-like copper molybdate (CuMoO₄) is synthesized via a simple hydrothermal route. Further, the crystalline nature of CuMoO₄ is confirmed via X-ray diffraction (XRD). The chemical states of the designed sample are determined via X-ray photoelectron spectroscopy (XPS). The morphology and elemental composition of CuMoO₄ are determined via scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques, as well as energy-dispersive X-ray (EDX) analyses. The CuMoO4 microspheres exhibit interconnected nanoflake-like structures, which can improve the active surface area and efficiency of CuMoO₄. Furthermore, the active surface area of the CuMoO4 microspheres is calculated via the Brunauer–Emmett–Teller (BET) method. The obtained catalytic performance of CuMoO₄ is compared with those of its basic metal oxides, such as MoO₃ and CuO. The obtained overpotentials (η) for CuO, MoO₃, IrO₂, and CuMoO₄ were 286, 294, 267, and 247 mV with Tafel slope values of 65, 84, 58, and 53 mV/dec, respectively. The study for long-term stability of the CuMoO4 electrode reveals that it can sustain the electrochemical activity for 12 h.