Abstract: High-performance activated carbon with the specifications of high surface area(1 500-2 000 m²/g),high apparent density (0.35-0.45 cm³/g),high pore volume (both volumes of pores of sizes 2-50 nm and <2 mm respectively are higher than 0.45 cm³/g), unit static capacitance >30 F/cm³, suitable for the electrode of double-layer capacitor, was prepared from walnut hull by chemical-physical method. Under SEM,structure of the sample carbonized by addition of catalyst was observed. It was showed that yield of carbonization was improved 10% and microstructure of original material was developed. The result of pore structure analysis of activated carbons indicated that both micropore and mesopore volumes were enhanced by 0.20-0.30 cm³/g.

Key words: activated carbon, double-layer capacitor, microstructure