Preparation and capacitor performance of composites based on mesoporous carbon/nanofibrous carbons

Abstract

Composites have been prepared by the carbonization of an ordered mesoporous carbon precursor coated on nano-carbon substrates for high-rate double-layer capacitor electrodes. The reproducibility of mesopore structure at 3.8 nm depends on the carbonization conditions, the loading amount of precursor, and the substrate. The specific surface area of the composite based on vapor grown carbon fiber (VGCF) reaches 250 m² g⁻¹ and has unique pore characteristics. The test cell with the composite based on VGCF exhibited ca. 4 F g⁻¹ of specific capacitance at best and maintained the capacitance under high-rate conditions. The capacitance of the test cell with the composite electrodes depends on the pore structure of the composite.