While oxygen evolution reaction (OER) taking place at the anode during water splitting reaction, is a very promising route towards clean and renewable energy, synthesis of highly efficient OER catalysts from earth-abundant, precious metal-free resources is the most challenging aspect of the field. We have synthesized a series of nanostructured nickel selenides, NiSe, NiSe₂, Ni₃Se₂ and Ni₃Se₄ as active catalytic materials for the OER in alkaline medium. While Ni has been proven to show promising catalytic activity, the significant improvement in efficiency observed in this series towards OER can also be partly due to the formed nanostructured interface which increases the exposed surface area of the catalyst. These pure nickel selenides were synthesized by hydrothermal reactions and showed low overpotential at 10 mA cm^-2 current density, early onset of catalytic activity, as well as high overall current density during the OER electrocatalytic activity in 1.0 M KOH. The overpotentials at 10 mA cm^-2 current density for the above series of nickel selenides are 220, 200, 240 and 250 mV, for NiSe, NiSe₂, Ni­₃Se₂ and Ni₃Se₄, respectively. Additionally, we have also investigated the stability of this catalyst during long-term OER conditions under 1.0 M KOH, which confirmed that these electrocatalysts maintained their structural and compositional integrity under operational condition for extended period of time. In this presentation we will discuss about the effect of nanostructured morphology on electrocatalytic performance and will offer some insight about designing better electrocatalysts incorporating morphology control. The synthesis of nanostructured electrocatalysts, characterization techniques such as XRD, SEM, TEM and STEM, and detailed electrochemical investigations for catalytic activity will be also discussed.