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Mg(OH)2 thin film was electrodeposited on SnO2 glass substrate (surface area,2.25 cm2) by the cathodic reduction of an aqueous magnesium nitrate solution (concentration, 0.1M).Pt plate and a saturated calomel electrode (SCE) serve as the counter electrode and reference electrode.The synthesis of thin films and all electrochemical characterizations were performed on Par 2273 Potentiostats Electrochemistry Workstation driven by PowerSuite Software.