<p>In this work, a heterojunction SnO₂@MoS₂/CNTs composite was successfully fabricated via a two-step hydrothermal strategy followed by thermal annealing, achieving a chemically bonded ternary heterojunction through the sequential growth of MoS₂ on CNTs and subsequent anchoring of SnO₂. Structural analyses confirm the uniform integration of SnO₂ and MoS₂ on conductive CNTs, forming a stable ternary composite. Benefiting from synergistic redox activity and improved electronic and ionic transport, the material delivers a high specific capacitance of 1848.06 F g⁻¹ at 1 A g⁻¹ and retains 87.78% of its capacitance after 5000 cycles at 10 A g⁻¹. The assembled hybrid supercapacitor achieves 38.75 Wh kg⁻¹ at 792.62 W kg⁻¹, with 50.35% retention after long-term cycling. These results provide new insights into the design of advanced energy-storage materials.</p>