太西煤基新型功能炭材料的制备及其电化学性能

以宁夏太西煤高温直流电煅炉制备的煤基石墨为原料,利用Hummers氧化法制备了氧化石墨,然后分别采用水热法和高温膨胀法制备了煤基三维石墨烯气凝胶(3D-GA)和煤基膨胀石墨(EG)两种新型功能炭材料,并通过FTIR,XRD和SEM对其进行了表征,利用电化学工作站对其电化学性能进行了测试和比较。结果表明:在电流密度500 mA/g下,3D-GA和EG的比电容分别为206 F/g和214 F/g,相比煤基石墨烯粉体(G)的比电容113 F/g,分别提高了82.3%和89.4%;充放电循环1000圈后,3D-GA和EG的比电容保持率分别为95.1%和101%,3D-GA和EG均表现出良好的循环稳定性。

Preparation and Electrochemical Properties of Novel Functional Carbon Materials Based on Taixi Coal

Using graphite oxide(GO),which was prepared from Taixi coal-based graphite with an improved oxidation-reduction method,as raw material,expanded graphite(EG)and three-dimensional graphene aerogel(3D-GA)were prepared via in situ high temperature expansion method and hydrothermal method,respectively.The structures of two functional carbon materials were characterized by FTIR,XRD and SEM.The electrochemical properties were tested and compared by electrochemical workstation.The results show that at the current density of 500 mA/g,the specific capacitences of 3D-GA and EG are 206 F/g and 214 F/g,respectively,which are 82.3%and 89.4%higher than that of coal-based graphene power(G)(113 F/g)respectively.After 1000 cycles,the specific capacitance retentions of 3D-GA and EG are 95.1%and 101%,respectively.3D-GA and EG both show good cyclic stability.