<p>SnO₂-based materials are important for supercapacitors due to their high theoretical capacitance, good chemical stability, and excellent electrical conductivity. In this study, a nanocomposite (NC) material composed of tin oxide (SnO₂) and titanium dioxide (TiO₂) was successfully synthesized using the mechanical alloying technique, a solid-state process known for producing fine, homogeneously mixed nanostructures. The combination of SnO₂ and TiO₂ resulted in the formation of a well-defined heterojunction at their interface. This heterojunction plays a crucial role in enhancing the electronic interactions between the two semiconductor oxides, facilitating more efficient charge transfer and improving the material’s overall electrical conductivity. Comprehensive characterization techniques were employed to analyze the structural, morphological, and electrochemical properties of the synthesized SnO₂–TiO₂ NC. The electrochemical behavior was evaluated in a three-electrode configuration, where the nanocomposite demonstrated a significantly enhanced specific capacitance of 162 Fg⁻¹ at a current density of 1 Ag⁻¹. As-synthesized NC exhibited significant capacitance and coulombic retention percentage (~ 88%) over 5000 cycles. This performance was markedly superior to that of the individual SnO₂ and TiO₂ oxides, highlighting the advantage of the composite structure.</p> Graphical Abstract <p></p>