以氯化铵为成孔助剂两步法制备玉米芯基活性炭（英文）

A two-step method for the preparation of high performance corncob-based activated carbons as supercapacitor electrodes using ammonium chloride as a pore forming additive

采用玉米芯为原料,氯化铵为成孔助剂,KOH为活化剂,经水热法制备出活性炭。考察制备条件对活性炭碘值和产率的影响,并采用SEM,TG和XRD等手段对材料进行表征。结果表明,氯化铵的加入有助于活性炭多孔结构的形成。以氯化铵作为成孔助剂所制玉米芯基活性炭电极的比容量为175 F·g^(-1),电流密度由0.5 A·g^(-1)升至20 A·g^(-1)时,电极的容量保持率为73.0%;在10 000圈的恒流充放电过程中,比容量由175 F·g^(-1)降至173 F·g^(-1)。

Activated carbons were prepared from corncobs by an initial hydrothermal treatment using ammonium chloride as a pore forming additive and then by KOH activation.Samples were characterized by SEM,XRD,TG analysis and nitrogen adsorption.The effects of preparation conditions on the iodine number,yield and their electrochemical performance as supercapacitor electrodes were investigated.Results indicate that NH 4Cl is helpful for the formation of activated carbons with a hierarchical pore structure.The best activated carbon prepared has a good rate performance with a capacitance of 175 F·g-1 at 0.5 A·g-1 and a capacity retention ratio of 73.0%at 20 A·g-1,and a good cycling stability with a specific capacity change from 175 to 173 F·g-1 after a 10 000 charge/discharge test.