Preparation of MnO2/coal-based graphene composites for supercapacitors
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摘要: 以纯化的太西无烟煤粉为原料，采用催化石墨化及改良Hummers氧化技术制备煤基氧化石墨烯前驱体，将该前驱体与MnO2进行原位复合并利用等离子体技术还原制备MnO2/煤基石墨烯纳米复合材料。采用红外光谱、X射线衍射、扫描电镜和透射电镜等技术对煤基石墨烯及其复合材料进行表征，采用循环伏安法及恒流充放电法测试MnO2/煤基石墨烯纳米复合材料的电化学性能。结果表明，与煤基石墨烯相比，MnO2/煤基石墨烯纳米复合材料的比电容有显著提升，在1 A/g电流密度下可达281.8 F/g，是煤基石墨烯比电容的3.48倍。Abstract: The low-cost production of high performance functional materials based on graphene remains a challenging task. One of the options for tackling this problem is to develop new processes based on cheap starting materials such as coal. Coal-based graphene precursors were prepared from purified Taixi anthracite by catalytic graphitization combined with an improved Hummers method. These were mixed with MnO2 and reduced by a low temperature plasma to make MnO2/coal-based graphene nanocomposites. The composites were studied by FT-IR, XRD, TEM and SEM. Their electrochemical performance was evaluated using cyclic voltammetry and galvanostatic charge/discharge. Results show that MnO2 has been even lydeposited on the graphene surface and the specific capacitance of the composite as an electrode in a supercapacitor is much higher than that of coal-based graphene without MnO2. The highest capacitance is 281.1 F/g, which is 261.2% of the value for coal-based graphene.
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Key words:
- Taixi coal /
- Coal-based graphene /
- Electrochemical properties /
- Nanocomposites
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