This research is dedicated to the process of obtaining of nickel deposits with developed surface allowing to lower overvoltage during hydrogen and oxygen evolution reaction from alkali solution. Nickel electrodeposition solution contained 34 g/l NiSO4·7H2O, 130 g/l NaCl и 33 g/l NH4Cl. We received dendritic deposits with strong adhesion to the substrate at twice the limiting current density. Metallographic analysis shows that nickel layer, which consists of branched dendritic particles, is porous structure with specific surface area and porosity of 79 %. The rise of current density and electrolysis time increases microgeometry characteristics of deposit outer surface. Nickel porous layer allows us to significantly decrease cathodic overvoltage of hydrogen reduction and anodic overvoltage of oxygen evolution in 6M KOH solution.