Ni modified graphite electrode prepared by cycling at two cathodic and anodic ranges in NiCl2 and NaOH solutions, respectively. Electro-oxidation of ethanol on the electrode modified and effective parameters on it were investigated. Cyclic voltammetry (CV),

(CA) and electrochemical impedance spectroscopy (EIS) were used to study the modified electrode catalytic activity. Nickel oxyhydroxide was formed by repetitive potential cycling in alkaline solution. In presence of ethanol, the modified electrode graphite demonstrates significantly high current with low onset potential (about 0.2) for ethanol oxidation. In addition to, the effect of different nickel ions, as well as ions concentration on electrooxidation of ethanol was studied. The results showed that at a certain concentration of Ni deposited on graphite, increasing the concentration of leads to an increase in the current density of ethanol oxidation. On the other hand, at a constant concentration of hydroxide, increasing the concentration of Ni ions concentration up to a certain amount, can also increase the oxidation of ethanol.