以废弃中密度纤维板为原料,通过K2 CO3活化制备活性炭双电层电容器电极。探讨炭化温度(500℃)、碱炭比(K2CO3与炭化物的不同质量比,即2.5、3、3.5和4)、活化温度(800℃)和活化时间(1 h)对电极电化学性能的影响,并对活性炭进行表面化学结构、孔隙性质和电化学性能进行表征。结果表明,经炭化和活化作用,所得活性炭均含有氮元素,含氮质量分数为0.93%~2.86%。在不同质量活化剂K2 CO3的作用下,所得活性炭BET比表面积分别为569~1027 m2/g,不同比表面积活性炭作电极经测试得到不同质量比电容,所得比电容为147~223 F/g。另外,当碱炭比为3.5时,所得活性炭电极的质量比电容和电化学性能最佳,归因于此条件下所制活性炭具有高比表面积和大的孔隙,并含有含氮官能团。
N-doped activated carbons for electric double-layer capacitors were prepared from waste medium density fiberboard u-sing K2 CO3 activation. The effects of carbonization temperature, activation temperature, activation time and K2 CO3/coke mass rati-os on surface chemical compositions, pore structure and electrochemical performance of the resulting activated carbons were investi-gated. Results indicated that the activated carbons had nitrogen contents from 0. 93-2. 86%, Brunauer-Emmett-Teller specific surface areas from 569 m2/g to 1 027 m2/g and specific capacitances from 147 F/g to 223 F/g, depending on carbonization and activation conditions. The maximum specific capacitance was attributed to a high surface area, optimum pore size, large pore volume and high N-5 ( the pyrrolic nitrogen and pyridinic nitrogen in association with oxygen functionality) content.
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