This work presents results obtained from the production of low-cost carbons from expanded graphite (EG) and pinecone (PC) biomass, activated in potassium hydroxide (KOH) and finally carbonized in argon and hydrogen atmosphere. A specific surface area of 808m2 g−1 and 457m2 g−1 were measured for activated pinecone carbon (APC) and activated expanded graphite (AEG), respectively. The electrochemical characterization of the novel materials in a 2-electrode configuration as supercapacitor electrode shows a specific capacitance of 69Fg−1 at 0.5Ag−1, high energy density of 24.6Whkg−1 at a power density of 400Wkg−1. This asymmetric supercapacitor also exhibits outstanding stability after voltage holding at the maximum voltage for 110h, suggesting that the asymmetric device based on different carbon materials has a huge capacity for a high-performance electrode in electrochemical applications.