Mesoporous Carbon Materials as Electrodes for Electrochemical Supercapacitors

摘要

In this paper, we report the synthesis and characterization of mesoporous carbons, which wereobtained using SBA-15 silica as the template material and sucrose as the carbon source. The preparedsilica template and mesoporous carbons were characterized by nitrogen adsorption-desorption, lowangle X-ray diffraction (XRD) and transmission electron microscopy (TEM). Synthesized carbonswere used to prepare composite electrodes for solid-state supercapacitors. The electrochemicalcharacteristics of mesoporous carbons in supercapacitors were studied by cyclic voltammetry andelectrochemical impedance spectroscopy. The study showed that a value of specific capacitance of 132F g-1 (for a single electrode) was obtained with the CMK-3A mesoporous carbon, which was 68%higher than that of an activated carbon that was used as a reference material. The superiorperformance was 127% (12.05 F cm-2 vs. 5.3 F cm-2) when the double-layer capacitance of themesoporous carbon was compared to that of the reference carbon. These findings for the mesoporouscarbon-based supercapacitor were explained on the basis of a high pseudo-capacitance and otherphysico-chemical properties of this carbon, such as the pore structure, accessibility of pores to theelectrolyte, and surface wettability by surface functional groups. All of these properties were improvedcompared to those of the activated carbon.