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| Influence of temperature on the structure of lignin conductive charcoal graphitization |
| ZHOU Hui-long1, XIAO Gang1,WU Rong-bing1, HUANG Lei1,NI Ming-jiang1, GAO Xiang1, CEN Ke-fa1 |
| 1.State key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China |
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Abstract The conductive charcoal was prepared from lignin using Ni-based catalyst（C4H6O4Ni·4H2O）at high temperatures, and the influences of temperature were studied, especially on the evolution of graphite structure of the conductive charcoal. The graphitization structure was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy, respectively. The graphitization began at 500 ℃, and the half width of D peaks and R-value decreased as the temperature increased, indicating a higher degree of graphitization. The electrical resistivity of the conductive charcoal and the degree of graphitization reached 0.078Ω·cm and 83.7%, respectively, when the temperature was 1 100 ℃. For XRD analysis, the d002 interlayer spacing gradually approached the d002 interlayer spacing of pure graphite when the carbonization temperature increased, meanwhile the content of graphite-like microcrystalline increased and the electrical resistivity decreased.
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Published: 01 November 2014
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炭化温度对木质素导电炭石墨化结构的影响
为了分析和探索导电炭在不同炭化温度下石墨化的特性,以Ni（C4H6O4Ni·4H2O）为催化剂,木质素为原料,催化炭化制备生物质导电炭.通过X射线衍射(XRD),透射电镜(TEM)和拉曼光谱分析手段对导电炭石墨化结构进行表征.结果表明,当木质素炭化温度为500 ℃时,可能开始出现石墨化现象,温度升高,D峰的半峰宽逐渐减小,两峰积分面积比值R值逐渐减小,石墨化程度更高,结晶更完整.炭化温度在1 100 ℃时,电阻率能达到0078 Ω·cm,石墨化度达到837％.炭化温度越高,导电炭的电阻率越小,层间距越小,石墨状微晶结晶度越高,d002晶面间的层间距越接近石墨d002层间距.
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