KavinkumarT NaveenkumarTR ThirumuruganARUN THIRUMURUGAN2025-06-052025-06-0520241387-7003https://hdl.handle.net/20.500.12740/22583The development of low-cost and highly efficient bifunctional electrocatalysts for overall water splitting is a challenging but urgent goal. Herein, nickel cobaltite (NiCo2O4) with different morphologies was developed for electrocatalytic overall water splitting. Encouragingly, the NiCo2O4 nanoneedle arrays required competitive hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 106 and 310 mV to achieve a density of 10 mA cm(-2) (j(10)) in KOH media, respectively. Furthermore, the as-made nanoneedle electrocatalyst employed as both anode and cathode, which displayed a low voltage of 1.67 V to attain j(10), with satisfactory durability for 50 h. The nanoneedle morphology not only improves the electrochemical active surface area, but also helpful to boost the charge transfer ability of NiCo2O4 and control the adsorption of reaction intermediates in water splitting. These results demonstrate the feasibility of the NiCo2O4 nanostructure by altering the active sites using morphology to develop the electrocatalytic activity of the materials. C1 [Kavinkumar, T.] Karpagam Acad Higher Educ, Dept Phys, Coimbatore 641021, India. [Kavinkumar, T.] Karpagam Acad Higher Educ, Ctr Energy & Environm, Coimbatore 641021, India. [Naveenkumar, T. R.] SRM Inst Sci & Technol, Dept Chem, Chennai 603202, Tamil Nadu, India. [Thirumurugan, Arun] Univ Atacama, Sede Vallenar, Costanera 105, Vallenar 1612178, Chile. C3 Karpagam Academy of Higher Education (KAHE); Karpagam Academy of Higher Education (KAHE); SRM Institute of Science & Technology Chennai; Universidad de Atacamainfo:eu-repo/semantics/closedAccessDifferent morphologiesHydrogen evolution reactionOxygen evolution reactionElectrocatalysisReaction kineticsChemistryArticulo de revista10.1016/j.inoche.2024.112582