摘要
This work investigated the effect of Na_(2)CO_(3)on the char structures of cellulose and lignin,respective-ly,and examined the electrochemi-cal performance of the char by act-ing as an active material for coin cells.The morphology of char can be significantly steered by the con-centration of Na_(2)CO_(3).Scanning electron microscopy analysis demonstrated that the intro-duction of Na_(2)CO_(3)into cellulose at an appropriate concentration led to the formation of tubular structure on its surface after pyrolysis,whereas the tubular structure was absent in the lignin char with the addition of Na_(2)CO_(3)at any concentrations.X-ray diffraction and Ra-man spectroscopy characterizations revealed that all the obtained chars from both cellulose and lignin,with or without Na_(2)CO_(3),were ascribed to non-crystalline graphite.Nevertheless,the crystal orientation of graphite from cellulose and lignin changed after the catalysis of Na_(2)CO_(3).Further electrochemical tests showed that cellulose char had a higher sodium stor-age capacity than that of lignin char.The excellent electrochemical performance of carbon materials derived from cellulose might hold a prospective application in the field of energy storage.
本文研究了Na_(2)CO_(3)对纤维素炭和木质素炭结构的影响,并考察了这些炭材料作为纽扣电池活性材料的电化学性能.结果显示,Na_(2)CO_(3)的浓度对炭材料的形貌有显著影响,扫描电镜分析表明,适当浓度的Na_(2)CO_(3)使纤维素热解后表面形成碳管结构,而在任意浓度的Na_(2)CO_(3)作用下,木质素炭热解后表面均未形成管状结构;X射线衍射和拉曼光谱表征显示,无论催化剂Na_(2)CO_(3)存在与否,制备的纤维素炭和木质素炭都属于非结晶石墨,然而Na_(2)CO_(3)的催化作用改变了纤维素炭和木质素炭的结晶取向.进一步的电化学测试表明,纤维素炭比木质素炭具有更高的储钠能力,纤维素炭材料优异的电化学性能,其在储能领域具有潜在的应用前景.
基金
supported by Foundation Project of Jihua Laboratory(X200191TL200).
