Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1906-1912.doi: 10.3866/PKU.WHXB201205221

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Preparation and Electrochemical Performance of Microporous Carbon Microspheres Obtained from Potato Starch

FU Xiao-Ting, JIA Fan, LI Wen-Bin, CHEN Ming-Ming, WANG Cheng-Yang   

  1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2012-04-19 Revised:2012-05-22 Published:2012-07-10
  • Contact: WANG Cheng-Yang E-mail:cywang@tju.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51172160, 50902102), National High Technology Research and Development Program of China (863) (2011AA11A232).

Abstract:

Potato starch, as an extensive biomass with natural globular structure, had been used to prepare microporous carbon microspheres by the promoting effect of H3PO4 on the pyrolysis of starch and the activation of KOH. Pore structure of samples was characterized by nitrogen adsorption/desorption at 77 K, and the results showed that micropores were the major component in samples. The micropore structure of samples was believed that it would afford enough accessible surfaces for capacitive storage. After the observation using scanning electron microscopy (SEM), it could be seen that the globular shape of starch was completely remained in the following carbonization and activation procedures, which was believed that H3PO4 played an important role in the process. The following Fourier Transform Infrared Spectrometer (FT-IR) characterization confirmed that the acceleration effect of H3PO4 on starch pyrolysis. The results of electrochemical measurement in 6 mol·L-1 KOH electrolyte showed that the product had excellent capacitive performances. Its specific capacitance was as high as 363.6 F·g-1 at a current density of 50 mA·g-1. And it exhibited excellent rate capability, which manifested that the cyclic voltammetry (CV) curve still remained rectangular and highly symmetric shape even when the scan rate reached as high as 300 mV·s-1.All the results demonstrate that the potato starch-based microporous carbon is a promising electrode material for high performance electrochemical capacitors.

Key words: Potato starch, Carbon microspheres, Micropores, High capacitance, Double electric layer capacitor

MSC2000: 

  • O646