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MnO_2进行原位复合并利用等离子体技术还原制备MnO_2/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MnO_2/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,MnO_2/煤基石墨烯纳米复合材料的比电容有显著提升,在1A/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。
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 MnO_2 and reduced by a low temperature plasma to make MnO_2/ 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 MnO_2 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 MnO_2.The highest capacitance is 281.1 F/g,which is 261.2% of the value for coal-based graphene.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2016年第5期545-549,共5页
New Carbon Materials
基金
国家自然科学基金(21276207
U1203292)~~
关键词
太西煤
煤基石墨烯
电化学性能
纳米复合材料
Taixi coal
Coal-based graphene
Electrochemical properties
Nanocomposites
