Benny, S.Galeb, W.Ezhilarasi, S.Rodney, J.D.Udayashankar, N.K.Raja, M.D.Madhavan, J.Arulmozhi, S.2026-02-032025Inorganic Chemistry Communications, 2025, 174, , pp. -13877003https://doi.org/10.1016/j.inoche.2025.114044https://idr.nitk.ac.in/handle/123456789/20338The substantial exhaustion of energy resources in the present reality limelight to the exigency for a clean and sustainable energy resource and the key solution for this would be electrocatalytic water splitting to produce clean H<inf>2</inf>. For achieving this objective amending noble metals with non-noble metals as electrocatalysts which are cost effective and earth abundant would serve as a better option. Herein, combustion derived nickel ferrite (NiFe<inf>2</inf>O<inf>4</inf>) and cobalt doped nickel ferrite (NiCo<inf>x</inf>Fe<inf>2-x</inf>O<inf>4</inf>) nanoparticles were extensively studied for Oxygen (O<inf>2</inf>) and Hydrogen (H<inf>2</inf>) evolution reactions respectively. The NiCo<inf>0.01</inf>Fe<inf>1.99</inf>O<inf>4</inf> and NiCo<inf>0.03</inf>Fe<inf>1.97</inf>O<inf>4</inf> Co-doped NiFe<inf>2</inf>O<inf>4</inf> electrocatalyst exhibits excellent Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER) activity in 1.0 M KOH electrolyte requiring a potential of 1.68 V (? = 455 mV) vs RHE for OER and ?0.167 V (? = 167 mV) vs RHE for HER to achieve the benchmark current density of 10 mA cm?2 and ?10 mA cm?2 for OER and HER respectively. The best performing electrodes (NiCo<inf>0.03</inf>Fe<inf>1.97</inf>O<inf>4</inf>NiCo<inf>0.01</inf>Fe<inf>1.99</inf>O<inf>4</inf>) were employed for overall water splitting which at a constant current density of 50 mA cm?2 acquired a cell voltage of around 2.2 V when it was put through the long-term stability test for a stretch of 24 h. Wherein, a slight increase of 30 mV that the initial voltage was spotted after 24 h which is an imperceptible loss. These results demonstrate that the doping of Co metal ions into NiFe<inf>2</inf>O<inf>4</inf> nanoparticles has resulted in an efficient noble metal free electrocatalyst for overall water splitting. © 2025 Elsevier B.V.ElectrocatalystNickel ferriteNon-noble metalsOverall water splitting