Preparation of activated carbons for supercapacitors by co-activation of coal and wheat stalk
Abstract：Three kinds of activated carbon materials （named AC1, AC2 and AC3 ） used for supercapacitor electrode were successfully prepared by using KOH activation method. The precursors for the preparation were Shenmu bitumi- nous coal, wheat stalk and their mixture, respectively. The pore structure and surface wettability of the as-prepared ac- tivated carbon materials were characterized by N2 adsorption and contact angle measurement. The electrochemical properties of supereapacitors with activated carbon materials as electrodes were studied by using galvanostatie charge- discharge, cyclic vohammetry, leakage current and electrochemical impedance techniques. The results show that the specific area of AC3 is as high as that of AC1 and its wettability is similar to that of AC2. In 3 moL/L KOH electrolyte, the supercapacitor with the sample AC3 as electrode has a higher specific capacitance of 270 F/g, better reehargeabili- ty, samller electrochemical impedance, and lower leakage current of 0. 01 mA. It indicates that there is some synergistic effect in the process of co-activation of coal and wheat stalk.
Keywords：activated carbonsupercapaeitorShenmu bituminous coalwheat stalkco-activation
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1385-1389 )