This study presents the design and synthesis of nitrogen (N) and phosphorus (P) dual-doped graphene as a nonmetallic catalyst for the electrocatalytic hydrogen evolution reaction (HER). The dual-doped graphene was designed based on theoretical predictions to enhance HER activity by synergistically activating the adjacent carbon atoms in the graphene matrix through the influence of N and P heteroatoms on the valence orbital energy levels. The dual-doped graphene showed higher HER activity than single-doped graphene and comparable performance to some traditional metallic catalysts. The study used density functional theory (DFT) calculations to explore various nonmetallic element-doped graphene models and selected N and P as codopants due to their contrasting charge populations in the graphene matrix. The codoping of N and P resulted in the highest HER activity among various doped graphene models. The N,P-graphene catalyst was synthesized by chemically doping graphene oxide with melamine and triphenylphosphine. The resulting catalyst showed much lower HER overpotential and higher exchange current density than pure and doped graphene samples. The catalyst also exhibited robust stability and applicability in a wide range of pH values. The study also demonstrated that the synergistic coupling effect between N and P heteroatoms enhances the proton adsorption and reduction capacity, leading to improved HER activity. The results indicate that well-designed carbon-based catalysts can achieve comparable activity to precious metals in HER. The study provides theoretical and experimental evidence that carbon-based catalysts have great potential as highly efficient HER catalysts.This study presents the design and synthesis of nitrogen (N) and phosphorus (P) dual-doped graphene as a nonmetallic catalyst for the electrocatalytic hydrogen evolution reaction (HER). The dual-doped graphene was designed based on theoretical predictions to enhance HER activity by synergistically activating the adjacent carbon atoms in the graphene matrix through the influence of N and P heteroatoms on the valence orbital energy levels. The dual-doped graphene showed higher HER activity than single-doped graphene and comparable performance to some traditional metallic catalysts. The study used density functional theory (DFT) calculations to explore various nonmetallic element-doped graphene models and selected N and P as codopants due to their contrasting charge populations in the graphene matrix. The codoping of N and P resulted in the highest HER activity among various doped graphene models. The N,P-graphene catalyst was synthesized by chemically doping graphene oxide with melamine and triphenylphosphine. The resulting catalyst showed much lower HER overpotential and higher exchange current density than pure and doped graphene samples. The catalyst also exhibited robust stability and applicability in a wide range of pH values. The study also demonstrated that the synergistic coupling effect between N and P heteroatoms enhances the proton adsorption and reduction capacity, leading to improved HER activity. The results indicate that well-designed carbon-based catalysts can achieve comparable activity to precious metals in HER. The study provides theoretical and experimental evidence that carbon-based catalysts have great potential as highly efficient HER catalysts.