A new convenient method for the synthesis of hydrated tris (2, 2'-bipyridine) dichloride ruthenium (II) complex has been developed. We introduced the chlorosulfonic acid as a chlorinating reagent during our synthetic process which replace the hexafluorophosphate radical of the [Ru (bpy) 3] (PF6)2 complex with chloride, form hydrated Tris [Ru (bpy) 3] (Cl)2 complex. The corresponding complex is characterized with UV-Visible, IR, CV, 1 H and C 13 NMR spectroscopic technique. The synthesized hydrated ruthenium complex was then checked as an electrocatalyst for the reduction of carbon dioxide in a designed electrolytic cell. The carbon dioxide gas in the aqueous solution of Tris (2, 2'-bipyridine) ruthenium (II) dichloride catalyst, at the potential of 1.5 V reduced to methane gas, examined with FTIR spectrometer.