This paper concerns the study of the Ru catalysts for water splitting which are the essential components for solar energy conversion to fuels. Investigations by electrolysis are allowing a quick determination of the essential reactivity parameters of the catalyst, its overpotential (OP) and its turnover frequency (TOF). Synthesis of Ru(PhnAc)2 was done by refluxing of 2,9dicarboxy-1,10-phenantrolinic acid (PhnAc) and Ru(II) salt in the dark and Ar medium, and final product was purified by chromatography column. All experiments were recorded on Potentiostat/Galvanostat Model 263A, in DMF (nonaqua) conditions, at 100 mV/s scan rate, 0.1 M NBu4BF4 as supporting electrolyte, glassy carbon working electrode, Ag/ACl reference and Pt counter electrode. On scanning at 100 mVs1 from 0.0V to +1.8 V solutions exhibited large, irreversible, Et3N concentration dependent oxidation waves at +1.2-1.7 V, these cathodic waves are assigned as the 1e- Ru(III)/Ru(II) couple. The pseudo-first order rate constant of the catalytic water oxidation (or hydroxide oxidation at pH>7), kcat, (usually referred as TOF of the catalyst) could be calculated by the equation [1]. This equation works for ncat = 4 electrons transferred in the catalytic reaction (water oxidation). Apparent rate constant, or TOF of our Ru(PhnAc)2 catalyst is 460 s-1 comparable with the reaction rate of 100–400 s−1 of the oxygen-evolving complex of photosystem II in vivo[2]. Based on the half-peak potential for experimental CVs, oxidation occurs at an OP of ~790 mV, this OP is within the typical range for many homogeneous water-oxidation catalysts (600–900 mV) [3,4]. So, from literature it was mentioned that this analysis is useful only for homogeneous electrocatalysts; this approach provides only an estimate of the TOF. Traditional methods of TOF calculating are difficult under these circumstances, but we managed to obtain an catalyst favorable for water oxidation with estimate TOF (460 s-1) and OP (~ 790 mV) .