With the growing population and energy demand, there is an urgent need for the production and storage of clean energy obtained from renewable resources. Water splitting electrocatalytically is a major approach to obtain clean H 2 . The efficiency, stability, and slow kinetics of anode materials developed so far do not fit the commercial application of the water oxidation reaction. To develop an efficient energy conversion catalyst, particularly for the oxygen evolution reaction (OER) herewith, Mn 2 (CO 3 ) 3 was electrodeposited on a Ni foam (NF) electrode surface by the chronoamperometric technique. The deposited Mn 2 (CO 3 ) 3 /NF was characterized using various surface characterization techniques. The electrochemical behavior of the Mn 2 (CO 3 ) 3 /NF-deposited electrode toward the OER was studied using electrochemical methods in KOH (pH 14) and NaHCO 3 (pH 8.3) electrolytes. The Mn 2 (CO 3 ) 3 /NF electrode showed a lower overpotential than CO 3 /NF and NF electrodes in the KOH/NaHCO 3 media. The Mn 2 (CO 3 ) 3 /NF electrode performs high electrocatalytic water oxidation with an overpotential of 360 mV at a current density of 10 mA•cm −2 . This overpotential is much lower than those of CO 3 /NF (460 mV) and bare NF (520 mV), with good long-term stability in the KOH medium without any catalytic degradation after 100 CV cycles and 15 h chronoamperometric studies. The stability of the electrodeposited Mn 2 (CO 3 ) 3 on the NF electrode was determined by X-ray photoelectron spectroscopy. Thus, the Mn 2 (CO 3 ) 3 /NF catalyst is suitable for the oxygen evolution reaction.