材料科学
石墨烯
电阻率和电导率
木质素
无定形碳
碳纤维
电阻和电导
退火(玻璃)
化学工程
焦耳加热
无定形固体
复合材料
纳米技术
化学
有机化学
复合数
电气工程
工程类
作者
Feng Jiang,Yonggang Yao,Bharath Natarajan,Chunpeng Yang,Tingting Gao,Hua Xie,Yilin Wang,Lisa X. Xu,Yukun Chen,Jeffrey W. Gilman,Lifeng Cui,Liangbing Hu
出处
期刊:Carbon
[Elsevier]
日期:2019-04-01
卷期号:144: 241-248
被引量:46
标识
DOI:10.1016/j.carbon.2018.12.030
摘要
Graphitic carbon has attracted tremendous research interest in recent years owing to its exceptional thermal and electrical properties that arise from the ordered sp2 hybridized carbon structure. Due to its high activation energy, graphitization is often energy- and chemical-intensive. In addition, the electrical conductivity of graphitized materials has always been limited by the presence of intrinsic defects. In this paper, we propose a new method to convert lignin-based biomass into highly crystalline graphitic carbon by a Joule heating process. The Joule heating utilizes the internal resistance of a reduced graphene oxide/lignin (rGO-lignin) carbon film to heat the sample to up to 2500 K within 1 h. The annealing of lignin at this high temperature is found to remove impurities and intrinsic defects, as well as to initiate the graphitization process. Amorphous lignin carbon can be converted into short-range ordered and graphitic carbon with an ultrahigh electrical conductivity of 4500 S/cm, significantly higher than the original 6.4 S/cm. The microstructure change underlying this high electrical conductivity was further probed through electron microscopy and chemical analysis. This highly crystalline, electrically conductive graphitized lignin-carbon is expected to be useful for numerous applications where high conductivity and corrosion resistance are desired.
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