马尾藻基超级活性炭的电化学性能研究

Electrochemical Properties of Super Activated Carbon Based on Sargassum

选取马尾藻作为前驱体制备超级电容器电极材料,使用氢氧化钾活化法,探究活化温度、活化时间、浸渍比对电化学性能的影响。其中SAC-800-120-4的比表面积可超过2400 m^2/g,介孔率为56%。采用二电极测试装置,以6 mol/L的KOH溶液作为电解液,在1 A/g的电流密度下,SAC-800-120-4的质量比电容达到了290 F/g,在5 A/g的电流密度下质量比电容为257F/g,电容保持率为89%,具有优良的倍率性能。在1A/g的电流密度下,SAC-800-120-4的能量密度为36.62 W·h/kg,功率密度为604.78 W/kg。

In this paper,Sargassum was used as the precursor to prepare supercapacitor electrode materials.The activation temperature,activation time,and the mass ratio of potassium hydroxide to biochar were investigated to analyze their effects on electrochemical performance of supercapacitors.Potassium hydroxide was used as the activator.The specific surface area of SAC-800-120-4 reached as high as 2400 m^2/g with a mesoporosity of 56%.At a current density of 1 A/g,the gravimetric specific capacitance of SAC-800-120-4 reached 290 F/g in a two-electrode system when 6 mol/L KOH aqueous solution was used as the electrolyte.At a current density of 5 A/g,the gravimetric specific capacitance was 257 F/g,with a capacitance retention rate of 89%,showing an excellent rate performance.At a current density of 1 A/g,the energy density of SAC-800-120-4 was 36.62 W·h/kg,and the power density was 604.78 W/kg.