A metal-free electrocatalyst composed of graphitic carbon nitride (g-C3N4) and nitrogen-doped graphene (N-graphene) has been developed for the hydrogen evolution reaction (HER). This hybrid catalyst demonstrates comparable HER activity to well-established metallic catalysts, such as nanostructured MoS2 materials, with an overpotential of ~240 mV and a Tafel slope of 51.5 mV dec⁻¹. The catalyst's unique structure and electronic properties, resulting from intrinsic chemical and electronic coupling between g-C3N4 and N-graphene, enhance proton adsorption and reduction kinetics. The hybrid exhibits robust stability in both acidic and alkaline environments, making it a promising alternative to precious metal catalysts. Density functional theory (DFT) calculations reveal that the catalyst's performance is due to a synergistic effect between the two components, with g-C3N4 providing active hydrogen adsorption sites and N-graphene facilitating electron transfer. The catalyst's HER activity is further supported by a free-energy diagram showing a low Gibbs free energy for the intermediate state, indicating its high efficiency. The study highlights the potential of metal-free catalysts in electrocatalytic applications, offering a new avenue for replacing noble metals with broader alternatives.A metal-free electrocatalyst composed of graphitic carbon nitride (g-C3N4) and nitrogen-doped graphene (N-graphene) has been developed for the hydrogen evolution reaction (HER). This hybrid catalyst demonstrates comparable HER activity to well-established metallic catalysts, such as nanostructured MoS2 materials, with an overpotential of ~240 mV and a Tafel slope of 51.5 mV dec⁻¹. The catalyst's unique structure and electronic properties, resulting from intrinsic chemical and electronic coupling between g-C3N4 and N-graphene, enhance proton adsorption and reduction kinetics. The hybrid exhibits robust stability in both acidic and alkaline environments, making it a promising alternative to precious metal catalysts. Density functional theory (DFT) calculations reveal that the catalyst's performance is due to a synergistic effect between the two components, with g-C3N4 providing active hydrogen adsorption sites and N-graphene facilitating electron transfer. The catalyst's HER activity is further supported by a free-energy diagram showing a low Gibbs free energy for the intermediate state, indicating its high efficiency. The study highlights the potential of metal-free catalysts in electrocatalytic applications, offering a new avenue for replacing noble metals with broader alternatives.