Nitrogen-doped carbon nanomaterials serve as efficient non-metal electrocatalysts for water oxidation. The study reports that nitrogen-doped carbon materials exhibit high oxygen evolution activity in alkaline media, with a current density of 10 mA cm⁻² at an overpotential of 0.38 V, comparable to iridium and cobalt oxide catalysts. These materials show the best performance among non-metal oxygen evolution electrocatalysts. Electrochemical and physical studies indicate that the high activity arises from pyridinic-nitrogen or quaternary-nitrogen-related active sites. The research highlights the potential of non-metal catalysts as alternatives to transition metal-based oxygen evolution catalysts. The global energy crisis has driven research into sustainable energy conversion and storage systems, particularly water splitting for hydrogen production. However, the efficiency of electrochemical water splitting is limited by high overpotential and the need for expensive noble metal catalysts. Researchers have explored non-precious metal materials, such as perovskite and cobalt/manganese oxides, to replace noble metals. A Co₃O₄/N-graphene catalyst achieved a current density of 10 mA cm⁻² at an overpotential of 0.4 V in alkaline electrolyte. Despite these advances, transition metal-based catalysts remain superior in performance. Recent studies have identified N(5)-ethyl-flavinium ions as organic non-metal electrocatalysts for water oxidation, though they require higher overpotentials. The current study demonstrates that nitrogen-doped graphite nanomaterials synthesized from a nitrogen-rich polymer exhibit highly efficient OER activity in alkaline media. The optimized nitrogen/carbon materials show OER overpotentials as low as 0.38 V at a current density of 10 mA cm⁻² in pH 13 medium, the best among non-metal OER electrocatalysts. Detailed studies indicate that the high OER activity is due to pyridinic-N or quaternary-N-related active sites. The N/C materials were synthesized by pyrolysing a melamine/formaldehyde polymer with nickel nitrate at 700°C, followed by acid leaching. The OER activity was assessed using a rotating ring-disk electrode (RRDE) system. The N/C catalyst generated a current density of 10 mA cm⁻² at 1.61 V versus RHE, comparable to IrO₂/C and Pt/C catalysts. The OER activity of the N/C materials was found to be due to nitrogen-related active sites, with no detectable nickel species in the N/C materials. The study also evaluated the OER stability of the N/C materials, showing that the activity remained stable after 20 cycles. The results indicate that nitrogen-doped carbon nanomaterials are promising non-metal electrocatalysts for water oxidation, with high efficiency and low overpotential. TheNitrogen-doped carbon nanomaterials serve as efficient non-metal electrocatalysts for water oxidation. The study reports that nitrogen-doped carbon materials exhibit high oxygen evolution activity in alkaline media, with a current density of 10 mA cm⁻² at an overpotential of 0.38 V, comparable to iridium and cobalt oxide catalysts. These materials show the best performance among non-metal oxygen evolution electrocatalysts. Electrochemical and physical studies indicate that the high activity arises from pyridinic-nitrogen or quaternary-nitrogen-related active sites. The research highlights the potential of non-metal catalysts as alternatives to transition metal-based oxygen evolution catalysts. The global energy crisis has driven research into sustainable energy conversion and storage systems, particularly water splitting for hydrogen production. However, the efficiency of electrochemical water splitting is limited by high overpotential and the need for expensive noble metal catalysts. Researchers have explored non-precious metal materials, such as perovskite and cobalt/manganese oxides, to replace noble metals. A Co₃O₄/N-graphene catalyst achieved a current density of 10 mA cm⁻² at an overpotential of 0.4 V in alkaline electrolyte. Despite these advances, transition metal-based catalysts remain superior in performance. Recent studies have identified N(5)-ethyl-flavinium ions as organic non-metal electrocatalysts for water oxidation, though they require higher overpotentials. The current study demonstrates that nitrogen-doped graphite nanomaterials synthesized from a nitrogen-rich polymer exhibit highly efficient OER activity in alkaline media. The optimized nitrogen/carbon materials show OER overpotentials as low as 0.38 V at a current density of 10 mA cm⁻² in pH 13 medium, the best among non-metal OER electrocatalysts. Detailed studies indicate that the high OER activity is due to pyridinic-N or quaternary-N-related active sites. The N/C materials were synthesized by pyrolysing a melamine/formaldehyde polymer with nickel nitrate at 700°C, followed by acid leaching. The OER activity was assessed using a rotating ring-disk electrode (RRDE) system. The N/C catalyst generated a current density of 10 mA cm⁻² at 1.61 V versus RHE, comparable to IrO₂/C and Pt/C catalysts. The OER activity of the N/C materials was found to be due to nitrogen-related active sites, with no detectable nickel species in the N/C materials. The study also evaluated the OER stability of the N/C materials, showing that the activity remained stable after 20 cycles. The results indicate that nitrogen-doped carbon nanomaterials are promising non-metal electrocatalysts for water oxidation, with high efficiency and low overpotential. The