摘要
三维石墨烯材料具有独特的多孔网络连通结构,大的比表面积,良好的光、电、热、力学等性质,被认为是理想的电极材料。以廉价煤炭为原料,通过催化热处理、化学氧化及水热还原等技术制得三维煤基石墨烯宏观体;采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶红外光谱(FT-IR)和拉曼光谱等检测手段对样品形貌及结构进行表征;并进一步通过恒电流充放电(GCD)、循环伏安(CV)及交流阻抗(EIS)等技术研究了三维石墨烯材料在碱性(6mol/L KOH)、酸性(1mol/L H_2SO_4)及中性(1mol/L Na_2SO_4)_3种水系电解液中的电化学性能。结果表明,三维煤基石墨烯材料在酸性和碱性电解液中具有较高的比电容;其中,在6mol/L KOH水系电解液中的比电容高达288.9F/g,并具有较好的稳定性,充放电循环1 000次后材料的电容保持率为91.6%。
3D graphene holds promise as electrode materials for electric double layer capacitors due to its unique porous network structure,large specific surface area and excellent optical,electrical,thermal and mechanical properties.In this paper,3D coalbased graphene（3D-CG）was prepared from coal by a combined technique involving the catalytic thermal treatment,modified Hummers method and one-step hydrothermal self-assembly method.The morphologies and structures of the samples were examined by TEM,SEM,XRD,FT-IR and Raman spectroscopy.Furthermore,the electrochemical properties of 3D-CG materials in 6 mol/L KOH,1 mol/L H2SO4 and 1 mol/L Na2SO4 electrolyte were systematically studied by galvanostatic charge-discharge（GCD）,cyclic voltammetry（CV）and electrochemical impedance spectra（EIS）tests.The results indicated the good capacitive performance and stability of 3D-CG,as the specific capacitance was 288.9 F/g in 6 mol/L KOH aqueous electrolyte,with a high retention ratio of 91.6% even after 1 000 cycles.
作者
张亚婷
任绍昭
党永强
刘国阳
李可可
周安宁
邱介山
ZHANG Yating REN Shaozhao DANG Yongqiang LIU Guoyang LI Keke ZHOU Anning QIU Jieshan(College of Chemistry and Chemical Engineering, Xi＇an University of Science and Technology, Xi＇an 710054 School of Chemical Engineering and Technology, Xi＇ an Jiaotong University, Xi＇ an 710049)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2017年第16期1-5,共5页
Materials Reports
基金
国家自然科学基金(21276207
U1203292)
关键词
煤基三维石墨烯
电极材料
电解液
电化学性能
超级电容器
3D coal-based graphene
electrode material
electrolyte
electrochemical performance
supercapacitor
