Effect of catalytic graphitization on the electrochemical behavior of wood derived carbons for use in supercapacitors

摘要

© 2014 Elsevier B.V. All rights reserved. Porous graphitic carbons were successfully obtained from wood precursors through pyrolysis using a transition metal as catalyst. Once the catalyst is removed, the resulting material mimics the microstructure of the wood and presents high surface area, open and interconnected porosity and large pore volume, high crystallinity and good electrical conductivity, making these carbons interesting for electrochemical devices. Carbons obtained were studied as electrodes for supercapacitors in half cell experiments, obtaining high capacitance values in a basic media (up to 133 F g-1 at current densities of 20 mA g-1 and 35 F g-1 at current densities of 1 A g-1). Long-cycling experiments showed excellent stability of the electrodes with no reduction of the initial capacitance values after 1000 cycles in voltammetry.