Azide-assisted hydrothermal synthesis of N-doped mesoporous carbon cloth for high-performance symmetric supercapacitor employing LiClO4 as electrolyte

作者：Zhang, Qian; Wang, Ni; Zhao, Peng; Yao, Mengqi; Hu, Wencheng^*

来源：Composites Part A: Applied Science and Manufacturing , 2017, 98: 58-65.

DOI：10.1016/j.compositesa.2017.03.013

• N-doped
• Porous
• Conductivity
• Sodium azide

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 m(2) g(-1), which was 6.5 times higher than that of carbon cloth (CC, 8 m(2) g(-1)), 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 Omega to 60 Omega after N-doping treatment. The NPCC device delivered a high areal capacitance of 130 mF cm(-2) at a current density of 1 mA cm(-2), and the highest volumetric energy density of 2.03 mW h cm(-3) (16.25 W h kg(-1)) was achieved at a volumetric power density of 0375 W cm(-3) (3 kW kg(-1)). Additionally, the device could retain 95.8% of its initial capacitance even after 30,000 cycles.

• 出版日期2017-7
• 单位电子薄膜与集成器件国家重点实验室; 电子科技大学