摘要
在油浴 90 ℃和常压下,采用化学还原法和冷冻干燥法合成了三维石墨烯宏观体(3D-RGM)。经过自组装得到的 3D-RGM 具有相互连接的介孔-大孔开放性孔结构,孔壁则是由单层或多层具有褶皱特征结构的还原石墨烯片组成。3D-RGM 具有很好的可压缩性,将其作为超级电容器的电极材料时可采用直接压片法制备工作电极。3D-RGM电极在 0.1 A/g电流密度下的比电容达到 150 F/g,是较优良的超级电容器材料。
In recent years, three-dimensional graphene networks have attracted much attention for both fundamental science and researches on their applications in the fields of environment, energy, sensors, adsorbents, electrochemical double-layer capacitors and electrode materials, due to their high specific surface areas, large pore volumes, strong mechanical strengths and rapid mass and electron transport. The assembly of microscale graphene oxide sheets into macroscopic architectures is a challenge for graphene fabrication. In this work, a facile method for the preparation of three-dimensional graphene macroform (3D-RGM) is developed via an in situ self-assembly of reduced graphene nanosheets at 90 ℃ under ambient atmosphere pressure without stirring. The morphology and composition of 3D-RGM are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Raman spectra. The as-synthesized 3D-RGM shows interconnected mesoporous and macroporous structures, and the pore wall is composed of flaky reduced graphene sheets with wrinkles. Furthermore, 3D-RGM presents strong mechanical strength and compressibility. In addition, the work electrode materials for supercapacitor were prepared by direct tableting and the supercapacitive performances of the electrodes were tested using a three-electrode system. The results show that the specific capacitance of 3D-RGM can reach 150 F/g at the current density of 0.1 A/g, and the interface resistance is about 1.3 Ω.
作者
王森
王永香
李金霞
WANG Sen;WANG Yongxiang;LI Jinxia(State Key Laboratory of Microbial Technology of Shandong University,Qingdao 266237,Shandong,China;Shanghai Institute of Quality Inspection and Technical Research,Shanghai 201114,China;School of Chemistry and Molecular Engineering,East China University of Science andTechnology,Shanghai 200237,China)
出处
《华东理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第3期382-387,共6页
Journal of East China University of Science and Technology
关键词
三维石墨烯
超级电容器
自组装
three-dimensional graphene
supercapacitor
self-assembly
