N掺杂白茅草花生物质碳的制备及其超级电容器性能研究

Preparation of N-doped imperata cylindrica substance carbon andits supercapacitor properties

原料来源广泛且绿色生态友好的生物质多孔碳受到广泛关注。白茅草花被成功开发为新型生物质多孔碳的前驱体,采用KOH作为活化剂,尿素作为掺杂剂,一步热解碳化形成氮掺杂多孔碳材料,并对最佳的尿素掺杂比例进行探究。采用SEM,TEM,XRD,Raman,XPS对制备的材料进行表征。通过三电极体系对材料的电化学性能进行测试。结果表明,在氢氧化钾处理后的白茅草花与尿素质量比为2∶1时,制备的电极材料具有最佳的性能。在6 mol/L KOH电解液中,电流密度为1 A/g时,材料的比电容为304.1 F/g,经过5000次长循环后,容量保持率为96.24%。

Biomass porous carbon with a wide range of raw material sources and green and eco-friendly has received extensive attention.In this manucript,the imperata cylindrica has successfully developed as a precursor of a new type of biomass porous carbon.With KOH as an activator and urea as a dopant nitrogen-doped porous carbon materials was formed by one-step pyrolysis and carbonization.And then we investigated the optimal doping ratio of urea.The prepared materials were characterized by SEM,TEM,XRD,Raman and XPS.The electrochemical performance of the material was tested by the three-electrode system.The results showed that the prepared electrode material had the best performance when the mass ratio of 2∶1.In 6 mol/L KOH electrolyte,when the current density is 1 A/g,the specific capacitance of the material is 304.1 F/g.After 5000 long cycles,the capacity retention rate is 96.24%.