Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 102-110.doi: 10.3866/PKU.WHXB201210231

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis of Nitrogen Doped Porous Carbons from Sodium Carboxymethyl Cellulose and the Capacitive Performance

CHEN Chong, CHEN Xiang-Ying, XIE Dong-Hua   

  1. Anhui Key Laboratory of Controllable Chemistry Reaction & Material Chemical Engineering, School of Chemical Engineering, Hefei University of Technology, Anhui 230009, P. R. China
  • Received:2012-10-02 Revised:2012-10-18 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21101052), Anhui Provincial Natural Science Foundation, China (090414194), China Postdoctoral Science Foundation (20100480045), and Fundamental Research Funds for the Central Universities, China.

Abstract:

We demonstrate a direct carbonization method to prepare porous carbons as electrode materials without an activation process, using sodium carboxymethyl cellulose (NaCMC) as the carbon source, which are further doped with varying mass ratios of nitrogen. From X-ray photoelectron data, the nitrogen species include pyridinic N, graphitic N, and pyrrolic N. The relative mass ratios of NaCMC and CO(NH2)2 affect the nature of the nitrogen species, dopant dosages as well as specific surface areas and pore structures. The cyclic voltammetry and galvanostatic charge-discharge measurements in 6 mol·L-1 KOH aqueous solutions reveal that the specific surface areas and capacitive performances improve after nitrogen-doping. Taking carbon-N-1:20 as example, its SBET can reach 858 m2·g-1, which is higher than that of carbon-blank (463 m2·g-1) and the corresponding specific capacitance greatly improves from 94.0 to 156.7 F· g-1, respectively. The present carbons are excellent electrode candidates for high-rate electrochemical capacitors.

Key words: Sodium carboxymethyl cellulose, Porous carbon, Nitrogen doping, Capacitive performance

MSC2000: 

  • O646