Graphitization of anthracite catalyzed by single metal oxides and its enhanced electrical conductivity

无烟煤 石墨 催化作用 材料科学 电阻率和电导率 化学工程 电导率 氧化物 金属 氧化石墨 拉曼光谱 复合材料 冶金 化学 有机化学 工程类 物理化学 物理 光学 电气工程
作者
Yude Zhang,Yan Li,Qian Zhang,Guangzhen Li
出处
期刊:International Journal of Coal Preparation and Utilization [Taylor & Francis]
卷期号:: 1-19
标识
DOI:10.1080/19392699.2023.2270925
摘要

ABSTRACTA series of synthetic graphite was fabricated through metal oxide catalytic graphitization using purified anthracite (TYC). The effects of graphitization temperature, catalyst type and its addition methods on structure and properties of graphite products were investigated through the methods of XRD, Raman spectra, SEM, TEM, FTIR and resistivity tester. Increasing graphitization temperature favors the enhancement of order and size of graphite microcrystals, graphitization degree, and conductivity of graphitized products. TiO2 exhibited the best catalytic effects in catalytic graphitization. Compared to directly graphitized TYC at 2800°C (TYC-28), the graphite catalyzed by TiO2 added physically (TYC-28-TiO2) and added chemically (TYC-28-C-TiO2) demonstrated a 13.0 and 16.7% increase in graphitization degree, respectively. Meanwhile, chemical addition method (0.61 × 10−4 Ω·m) outperformed physical addition method (1.21 × 10−4 Ω·m) in improving the electrical conductivity of graphitized products. Moreover, at 2400°C, TYC catalyzed by TiO2 added physically and added chemically presented a graphitization degree of 73.7 and 77.6%, respectively, both exceeding that of TYC-28 (70.7%). Therefore, metallic oxides can enhance the graphitization degree while lowering the required graphitization temperature. This method holds promise for cost-effective and energy-efficient production of high-conductivity graphitized anthracite for batteries, supercapacitors, conductive coatings, and conductive adhesives.KEYWORDS: Single metal oxidecatalytic graphitizationphysical additionChemical additionelectrical conductivity Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Natural Science Foundation of China under Grant [51104060, 51974110]; Key Scientific Research Projects of Colleges and Universities of Henan Province under Grant [21A440004]; Wuxi Feile High Performance Materials Co., Ltd under Grant [H18-385, H22-566].
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