The oxygen evolution reaction (OER) plays an important role in many energy conversion devices including photoelectrochemical cells, fuel cells and rechargeable metal air batteries. It proceeds through a four electron transfer water oxidation process and it is kinetically sluggish. It requires considerable high electrochemical overpotential to fill the significant losses in the energy conversion efficiency. The efficient and stable electrocatalyst can facilitate the sluggish kinetics of the OER. Earth-limited and expensive metal oxides such as RuO₂, IrO₂, PtO₂ are considered as most active OER electrocatalysts. However, their high-cost and low-availability limits their large-scale applications. Therefore, there is a great interest in developing OER catalysts based on earth-abundant metals such as copper (Cu) and cobalt (Co). Recently, the spinel-type CuCo₂O₄ exhibited promising OER activities and corrosion stability in alkaline media. However, preparation of the CuCo₂O₄ by the traditional solid-phase method involves high-temperature sintering and grinding. It gives the particles with limited electroactive surface area and inadequate electron transport property between the CuCo₂O₄ particles and collecting substrate. In the present study, we prepared a series of flower-like nanostructured Cu_xCo_3-xO₄ with high electroactive surface area via very simple and straightforward electrochemical deposition method and applied as catalysts for OER activity. They showed very promising OER activities and stabilities at low overpotentials due to their high electroactive surface area and high intrinsic electrical conductivity.