Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5439531 | Composites Part A: Applied Science and Manufacturing | 2017 | 26 Pages |
Abstract
In our investigation, N-doped porous carbon cloth (NPCC) was synthesized through KOH activation and sodium azide-assisted hydrothermal method to improve its surface area and conductivity, respectively. The morphology and structure of the obtained NPCC were investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy, and high-resolution transmission electron microscopy. Cyclic voltammetry, galvanostatic charge/discharge test, and electrochemical impedance spectroscopy were then performed to test electrochemical performance of the NPCC. The surface area of the NPCC was approximately 52 m2 gâ1, which was 6.5 times higher than that of carbon cloth (CC, 8 m2 gâ1), and the average pore size of NPCC was 5.0 nm. XPS demonstrated that elemental N (pyrrolic N and quaternary N) was successfully doped into the CC structure with a total N content of 3.49%. Electrochemical assessment was conducted in a symmetrical system in 1 M LiClO4/acetonitrile electrolyte. The charge transfer resistance was significantly decreased from 97 Ω to 60 Ω after N-doping treatment. The NPCC device delivered a high areal capacitance of 130 mF cmâ2 at a current density of 1 mA cmâ2, and the highest volumetric energy density of 2.03 mW h cmâ3 (16.25 W h kgâ1) was achieved at a volumetric power density of 0.375 W cmâ3 (3 kW kgâ1). Additionally, the device could retain 95.8% of its initial capacitance even after 30,000 cycles.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Qian Zhang, Ni Wang, Peng Zhao, Mengqi Yao, Wencheng Hu,