Nanostructured carbide-derived carbons (CDC) were synthesized from Ta 4 HfC 5 and WTiC 2 powders via gas phase chlorination within the temperature range from 800 to 1100°C. The results of X-ray diffraction, high-resolution transmission electron microscopy and Raman spectroscopy showed that the synthesized CDC materials are mainly amorphous, containing relatively small graphitic crystallites. The scanning electron microscopy data revealed the breaking down of the initial carbide particles into smaller ones. The low-temperature N 2 sorption experiments were performed and the specific micropore surface areas up to 1950m 2 g −1 and 1880m 2 g −1 were obtained for Ta 4 HfC 5 -CDC and WTiC 2 -CDC, respectively. The energy-related properties of the supercapacitors based on 1M (C 2 H 5 ) 3 CH 3 NBF 4 solution in acetonitrile and Ta 4 HfC 5 -CDC or WTiC 2 -CDC as an electrode material were investigated using the cyclic voltammetry, electrochemical impedance spectroscopy, galvanostatic charge/discharge and constant power charge/discharge methods. The Ragone plots (using the total material weight or volume of two electrodes) for the supercapacitors based on the Ta 4 HfC 5 -CDC and WTiC 2 -CDC electrodes have been calculated from constant power tests within the potential range from 3.0 to 1.5V, demonstrating the high gravimetric (28Whkg −1 ) and volumetric (18Whdm −3 ) energy densities at high power density (10kWkg −1 and 15kWdm −3 , respectively).