通过移动化学气相沉积法制备了木质素基碳纳米管/炭复合材料(L-CNT/C),并对其进行活化处理,获得高比表面积和发达的多孔结构的L-CNT/C电极。通过FESEM、TEM、Raman、FT-IR、TG等手段对复合材料的形貌、结构进行表征与分析,并考察了其作为电极材料的电化学性能。结果表明,温度升高利于碳管数量的增加,但过高的反应温度会导致复合材料石墨化程度降低。在三电极体系中,0.2 A/g电流密度下,L-CNT/C电极的质量比电容可达234.04 F/g,而木质素基炭材料的比电容仅为61.22 F/g。同时,L-CNT/C电极经过3 000次恒电流充放电测试后仍可保持初始电容的95.2%,循环稳定性优异。

Lignin-based carbon nanotube/carbon composites (L-CNT/C) are prepared through mobile chemical vapor deposition,and then activated to obtain a L-CNT/C electrode with high specific surface area and developed porous structure.The morphology and microstructure of the composites are characterized and analyzed by means of FESEM,TEM,Raman,FT-IR,TG,etc.Their electrochemical properties as electrode materials are also investigated.Results show that the increasing reaction temperature promotes the increase in the number of carbon nanotubes,but too high reaction temperature leads to a reduction in the degree of graphitization.In a three-electrode system,the mass specific capacitance of L-CNT/C electrode reaches 234.04 F·g^-1 at a current density of 0.2 A·g^-1,while that of the lignin-based carbon material is only 61.22 F·g^-1.The specific capacitance of L-CNT/C electrode can still maintain 95.2% of the initial value after 3 000 cycles,denoting an excellent cycling stability.

余澎(1998-),女,硕士研究生,研究方向为纳米功能材料电化学应用,876841348@qq.com。