Preparation of size-controlled all-lignin based carbon nanospheres and their electrochemical performance in supercapacitor
Preparation of size-controlled all-lignin based carbon nanospheres and their electrochemical performance in supercapacitor
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DOI：
10.1016/j.indcrop.2022.114689
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发表时间：
2022-05
影响因子：
5.9
通讯作者：
Hang Wang;Fuquan Xiong;Jiamei Yang;Bole Ma;Yan Qing;F. Chu;Yiqiang Wu
中科院分区：
文献类型：
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作者：
Hang Wang;Fuquan Xiong;Jiamei Yang;Bole Ma;Yan Qing;F. Chu;Yiqiang Wu
木质素是自然界中含量第二丰富的生物质原料，由于含有大量的芳环结构单元，被认为是一种理想的碳前驱体。碳纳米球作为碳材料的重要组成部分，在各个领域具有广阔的应用前景。然而，木质素基碳球的制备工艺复杂，球间交联度高，微米级尺寸不可调。通过自组装、稳定化处理和碳化处理，制备了尺寸和微观结构可调的全木质素基纳米碳球。随后，研究了它们在超级电容器电极材料中的应用。结果表明，可以构建单分散、有序、规则的碳纳米球。通过改变木质素的初始浓度，可以在256~416 nm的范围内调节LCNs的大小。通过调整尺寸和微观结构，所制备的LCNs的比表面积在652~736 m2g−1之间。将碳纳米管组装成电化学电容器后，电极材料的比电容高达147F/g−1。此外，基于碳纳米管的对称电容器具有超低的特征驰豫时间(0.86g S)和10,000次循环的长循环稳定性。通过协调碳化温度引起的纳米球的尺寸和微观结构，可以调节其电容性能。可控电容性能表明，所制备的LCNS是一种很有前途的储能候选材料。
Lignin, as the second most abundant biomass material in nature, is regarded as an ideal carbon precursor due to the presence of a larger amount of aromatic ring structural unit. Carbon nanospheres, as one of the vital members of carbon materials, are promising advanced materials for various areas. However, lignin-based carbon spheres suffered a complex fabrication process, high crosslinking between spheres, and non-adjustable micron size. Here, all-lignin based carbon nanospheres (LCNS) with tunable size and microstructure were prepared via self-assembly, stabilization treatment, and carbonization. Subsequently, their applications in supercapacitor electrode material were investigated. The results showed that the monodispersed, ordered, and regular carbon nanospheres could be constructed. The size of LCNS could be tuned ranging from 256 to 416 nm via changing the initial concentration of lignin between 0.5 and 2 mg mL−1. The as-prepared LCNS provided a specific surface area between 652 and 736 m2g−1through adjusting the size and microstructure. When the LCNS was assembled into the electrochemical capacitor, the LCNS electrode materials exhibited a high specific capacitance of 147 F g−1. Additionally, the LCNS-based symmetrical capacitor showed an ultralow characteristic relaxation time (0.86 s) and long cycle stability for 10,000 cycles. The capacitance properties could be regulated via reconciling the size of nanospheres and microstructure induced by carbonization temperature. The governable capacitance performance indicates that the as-prepared LCNS should be a promising candidate material for energy storage.