Rice-husk-based Silicon-carbide-derived Carbon as an Electrode Material for Electric Double-layer Capacitors

Abstract

Silicon-carbide-derived carbon (SiC-CDC) was prepared by heat treatment and chlorination of rice husk charcoal. Its specific surface area and micropore peak size were 1060 m2g−1 and ∼0.75 nm, while those of a α-SiC-CDC, fabricated by chlorination of α-SiC, were 1350 m2g−1 and ∼0.60 nm, respectively. These SiC-CDCs exhibited excellent surface-area-normalized capacitance as capacitor electrodes. The internal resistance of the rice husk-based SiC-CDC was significantly lower than that of the α-SiC-CDC and comparable to that of commercial activated carbon. Silicon-carbide-derived carbon (SiC-CDC) for capacitor electrodes was prepared by heat treatment and chlorination of rice husk. The rice husk-based SiC-CDCs, as well as a typical α-SiC-CDC fabricated from α-SiC, exhibited excellent surface-area-normalized capacitances. Moreover, the internal resistance of the rice husk-based SiC-CDC was significantly lower than that of the α-SiC-CDC and comparable to that of commercial activated carbon.