NDLI: A high-performance supercapacitor of vertically-oriented few-layered graphene with high-density defects

Content Provider	Royal Society of Chemistry (RSC)
Author	Qi, Jun Lei Wang, Xu Fei, Wei-Dong Lin, Jing Huang Zhang, Fu Feng, Ji Cai
Copyright Year	2015
Abstract	Pristine graphene with a 3D structure is desired for use in graphene-based supercapacitors, yet the very poor wettability of such graphene in water has limited its practical application. Here we report a way to simultaneously realize the 3D structure and good wettability in vertically-oriented few-layered graphene (VFG) grown by plasma-enhanced chemical vapor deposition. Based on scanning and transmission electron microscopic, Raman spectroscopic, contact angle (CA) and electrochemical analyses, a mechanism to explain the improved performance of VFG-based supercapacitors by defect-stimulated increases in wettability is proposed. The CA of our VFG samples notably reduces from 131° to 73° as the content of surface defects increases, which confirms that the wettability of VFG is markedly improved with an increased density of surface defects. Electrochemical results indicate that the VFG samples with a high density of defects exhibit high specific capacities of up to 704 μF cm−2 and a good cycling stability with about 91.2% capacitance retention after 3000 cycles. The excellent supercapacitor performance of the VFG samples with a high density of defects makes them attractive candidates for ultrathin high-performance supercapacitor electrodes.
Starting Page	3675
Ending Page	3682
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	8
Journal	Nanoscale
DOI	10.1039/c4nr07284g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Wetting Graphene VFG Electrochemistry Supercapacitor Capacitance Raman Contact angle Raman spectroscopy Plasma-enhanced chemical vapor deposition Three-dimensional space
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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