This study presents a high-performance supercapacitor electrode composed of a 2D hybrid nanocomposite material (h-BN/G/MoS₂) synthesized through ball milling and sonication methods. The nanocomposite consists of hexagonal boron nitride (h-BN), graphene, and molybdenum disulfide (MoS₂), with the optimal composition being 5% BN-G@MoS₂ 90@10. The material exhibits a high specific capacitance of 392 F g⁻¹ at a current density of 1 A g⁻¹ and retains 96.4% of its capacitance after 10,000 cycles. A symmetric supercapacitor fabricated using this composite electrode demonstrates a 94.1% capacitance retention rate after 10,000 cycles, an energy density of 16.4 Wh kg⁻¹, and a power density of 501 W kg⁻¹. The composite's superior electrochemical performance is attributed to the synergistic interaction between MoS₂, graphene, and h-BN, which enhances electrical conductivity and provides efficient ion diffusion channels. The synthesis process is environmentally safe, manageable, and suitable for large-scale production, making it a promising candidate for next-generation supercapacitors. The study also highlights the importance of optimizing the composition ratios of the nanocomposite to achieve high cycling stability and rate capability, essential for practical energy storage applications.This study presents a high-performance supercapacitor electrode composed of a 2D hybrid nanocomposite material (h-BN/G/MoS₂) synthesized through ball milling and sonication methods. The nanocomposite consists of hexagonal boron nitride (h-BN), graphene, and molybdenum disulfide (MoS₂), with the optimal composition being 5% BN-G@MoS₂ 90@10. The material exhibits a high specific capacitance of 392 F g⁻¹ at a current density of 1 A g⁻¹ and retains 96.4% of its capacitance after 10,000 cycles. A symmetric supercapacitor fabricated using this composite electrode demonstrates a 94.1% capacitance retention rate after 10,000 cycles, an energy density of 16.4 Wh kg⁻¹, and a power density of 501 W kg⁻¹. The composite's superior electrochemical performance is attributed to the synergistic interaction between MoS₂, graphene, and h-BN, which enhances electrical conductivity and provides efficient ion diffusion channels. The synthesis process is environmentally safe, manageable, and suitable for large-scale production, making it a promising candidate for next-generation supercapacitors. The study also highlights the importance of optimizing the composition ratios of the nanocomposite to achieve high cycling stability and rate capability, essential for practical energy storage applications.