Mesoporous carbon (N-CMK3) decorated with different amounts of SnO 2 nanoparticles was prepared in a controllable manner by using an incipient wetness impregnation technique, followed by a chemical reduction process, for application as a supercapacitor. The results of the analysis demonstrated that the surface area and pore volume of N-CMK3 decorated with SnO 2 continued to decrease after impregnation with increasing amounts of SnO 2 . The results of the electrochemical measurement proved that decoration of N-CMK3 with a suitable amount of SnO 2 enhanced the specific capacitance of the electrodes. Among the SnO 2 @N-CMK3 (SNC) samples under investigation, 15-SNC with 15 wt% SnO 2 delivered outstanding electrochemical performance with respect to specific capacitance and cycling stability. At a scan rate of 5 mV s −1 , 15-SNC exhibited superspecific capacitance up to 344 F g −1 and long-term cyclability at a scan rate of 50 mV s −1 with 92.4% retention of its initial specific capacitance of 161 F g −1 after 5000 cycles. A unique material comprising mesoporous carbon decorated with tin oxide was synthesised by facile incipient wetness impregnation for enhanced charge storage.