Abstract
Carbon powder was synthesized from bamboo shoots by chemical activation. The porous carbon powders were activated by potassium hydroxide (KOH) with a ratio of carbon powder (C) and KOH (C : KOH) of 1 : 1, 1 : 2, 1 : 3, and 1 : 4 by weight, respectively. Structure, morphological properties, and the porosity of activated carbon powders were investigated by XRD, EDX, SEM, and BET. The electrochemical performances were measured by charge/discharge (CD) and cyclic voltammetry (CV) techniques. Specific surface areas increased to1,017,1,162,1,257,and1,012m2 g−1 forC:KOHratiosof1:1,1:2,1:3,and1:4, respectively. Specific capacitances were 11.30, 26.60, 50.50, and 40.50 F g–1 for the C : KOH ratios of 1 : 1, 1 : 2, 1 : 3, and 1 : 4, respectively. The activated carbon electrode with a C: KOH ratio of 1 : 3 sintered at 600 °C displayed the highest specific capacitance value of 50.5 F g–1. It should be a good candidate material for high-performance supercapacitor electrodes.
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