Microwave-assisted preparation of peanut shell-based activated carbons and their use in electrochemical capacitors》.pdfVIP

NEW CARBON MATERIALS Volume 30, Issue 1, Feb 2015 Online English edition of the Chinese language journal Cite this article as: New Carbon Materials, 2015, 30(1):86–91 RESEARCH PAPER Microwave-assisted preparation of peanut shell-based activated carbons and their use in electrochemical capacitors 1 2 2 2 1 1 Ming-bo Wu *, Ru-chun Li , Xiao-jun He *, He-bao Zhang , Wu-bin Sui , Ming-hui Tan 1State Key Laboratory of Heavy Oil Processing, College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China; 2School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China Abstract: Activated carbons (ACs) were prepared from peanut shells by KOH activation under microwave heating and were used as electrode materials for electrochemical capacitors (ECs). The pore structure of the ACs was characterized by nitrogen adsorption and the electrochemical performance by galvanostatic charge-discharge and cyclic voltammetry. Results show that the ACs’ specific surface area, total pore volume, specific capacitance, as well as energy density are maximized using an activation time from 6 to 10 min or KOH/peanut shell mass ratio from 0.6 to 2.0 under otherwise identical conditions . When the KOH/peanut shell mass ratio was 1.0, microwave power was 600 W and activation time was 2 8 min, the specific surface area of the resulting AC was 1277 m /g and its energy density was 8.3