Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (4): 676-684.doi: 10.3866/PKU.WHXB201501281

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Supercapacitive Performance of N, S Co-Doped Activated Carbon Materials

LI Zhao-Hui, LI Shi-Jiao, ZHOU Jin, ZHU Ting-Ting, SHEN Hong-Long, ZHUO Shu-Ping   

  1. School of Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong Province, P. R. China
  • Received:2014-11-13 Revised:2015-01-23 Published:2015-04-03
  • Contact: ZHOU Jin, ZHUO Shu-Ping E-mail:zhoujsdut@gmail;zhuosp_cademic@yahoo.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51302156).

Abstract:

In this work, N, S co-doped microporous carbon materials were successfully prepared using human hair and sucrose as carbon precursors via a two-step method that combined hydrothermal treatment and post-KOH activation. The morphology, pore texture, and surface chemical properties of the activated carbon materials were investigated by scanning electron microscopy, transmission electron microscopy, N2 adsorption/desorption, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy. The electrochemical capacitive behavior of the prepared carbons was systematically studied in 6 mol·L-1 KOH electrolyte. The maximum specific surface area of the prepared carbons was found to be 1849.4 m2·g-1 with a porosity that mainly consisted of micropores. Nitrogen and sulfur contents varied from 1.6% to 2.5% and from 0.2% to 0.5% (atomic fraction (x)), respectively. The synergistic-positive effect of N, O, and S-containing groups caused the prepared carbons to exhibit a large pseudo-capacitance. High specific capacitances of up to 200 F·g-1 at 0.2 A·g-1 were observed, response to an energy density of 6.9 Wh·kg-1. At a power density of 10000 W·kg-1, the energy density was found to be 4.1 Wh·kg-1. The present work highlights the significance of this new strategy to prepare N, S co-doped carbon materials from renewable biomass.

Key words: Carbon materials, Supercapacitor, Human hair, Electrochemical property, Hydrothermal treatment

MSC2000: 

  • O646