Reduced graphene oxide (rGO) aerogels were fabricated using cryogenic casting combined with thermal reduction. The above combination allows for the design of the structural framework and adjustment of the porosity and material surface properties suitable for supercapacitor electrode applications. The material properties were investigated using modern physical techniques, such as SEM-EDX, BET, IR, XRD, and Raman spectroscopy. The electrochemical properties of the material were evaluated in a two-electrode supercapacitor system using CV, GCD, and EIS. The results showed that, at a reduction temperature of 500 ℃, the rGO aerogel material obtained had structural characteristics suitable for manufacturing supercapacitor electrodes, with a large specific surface area of 279 m2/g and a pore volume of 0.6 cm3/g. In the supercapacitor system, the rGO aerogel electrode exhibited excellent electrochemical properties, with a high specific capacitance of 115 F/g (0.1 A/g), maintaining a specific capacitance retention of 93% after 1000 cycles. This study showed the potential of rGO aerogel material in supercapacitor applications, which can replace other types of carbon materials to fabricate supercapacitors with high electrochemical properties.