THE INFLUENCE OF NITRIC ACID OXIDATION TREATMENT ON THE ELECTROCHEMICAL PERFORMANCE OF ASPHALTENE-BASED ORDERED MESOPOROUS CARBON

摘要

Electrochemical double layer capacitor (EDLC) is an energy storage device storing the energy by accumulation of charges at the electrode/electrolyte interface]!]. Carbon materials are considered as the most widely studied EDLC electrode materials for their unique advantages such as high surface area, good electrical conductivity and excellent chemical stability[2]. The regular interconnected mesopore channels of ordered mesoporous carbon (OMC) can facilitate ion transport by providing smaller resistance and shorter diffusion pathways, which makes OMCs to be promising candidates for electrode materials in EDLC[3]. Oxygen functionalities are often present on the carbon surface to increase the specific capacitance, energy density and power density. While, little researches focus on the ion transfer behavior of carbon electrode after acid treatment for the difficulty in controlling the pore surface and pore structures. Herein, asphaltene-based OMC were synthesized and treated by acid, and the electrochemical performance of OMC after HNO3 treatment was investigated. The ion transport behaviors and frequency response characteristics were further discussed.