期刊
ADVANCED MATERIALS
卷 30, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704449
关键词
3D graphene; carbon electrodes; carbon nanodots; supercapacitors; turbostratic graphene
类别
资金
- Deutsche Forschungsgemeinschaft (German Academic Research Society) [STR1508/1-1]
A facile method to convert biomolecule-based carbon nanodots (CNDs) into high-surface-area 3D-graphene networks with excellent electrochemical properties is presented. Initially, CNDs are synthesized by microwave-assisted thermolysis of citric acid and urea according to previously published protocols. Next, the CNDs are annealed up to 400 degrees C in a tube furnace in an oxygen-free environment. Finally, films of the thermolyzed CNDs are converted into open porous 3D turbostratic graphene (3D-ts-graphene) networks by irradiation with an infrared laser. Based upon characterizations using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and Raman spectroscopy, a feasible reaction mechanism for both the thermolysis of the CNDs and the subsequent laser conversion into 3D-ts-graphene is presented. The 3D-ts-graphene networks show excellent morphological properties, such as a hierarchical porous structure and a high surface area, as well as promising electrochemical properties. For example, nearly ideal capacitive behavior with a volumetric capacitance of 27.5 mF L-1 is achieved at a current density of 560 A L-1, which corresponds to an energy density of 24.1 mWh L-1 at a power density of 711 W L-1. Remarkable is the extremely fast charge-discharge cycling rate with a time constant of 3.44 ms.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据