Green Reduction of Cobalt Ferrocyanide with Excellent Electrocatalytic Activity toward the Oxygen Evolution Reaction

The development of earth-friendly efficient electro-catalysts for the oxygen evolution reaction (OER) becomes crucial for renewable energy production. In this work, green synthesized reduced cobalt ferrocyanide at different time intervals (RCFC-t) was demonstrated as an effective and long-lasting electrocatalyst for the OER process. The RCFC-10 loaded glassy carbon electrode runs at an overpotential of 321 mV (1.55 V) at 10 mA cm(-2) , and a lower overpotential of 291 mV exhibited by the optimal RCFC-10/ nickel foam was almost comparable to the benchmark catalyst, such as IrO2 . This newborn RCFC-10 shows excellent OER performance and durability over 250 h with 4.1% potential loss in alkaline medium. At 1.58 V, the solar-driven water electrolysis demonstration supports the efficiency of a newborn electrocatalyst in solar-to-hydrogen conversion. These research findings confirm that low-cost greener synthesized RCFC-10/NF can be used for large-scale hydrogen generation.