Impact of size on energy storage performance of graphene based supercapacitor electrode

CORC > 苏州纳米技术与纳米仿生研究所 > 中国科学院苏州纳米技术与纳米仿生研究所 > 纳米研究国际实验室 > 张跃钢团队

	Impact of size on energy storage performance of graphene based supercapacitor electrode
	Lu, L; Li, WF; Zhou, LS(周丽莎); Zhang, YJ; Zhang, Z; Chen, Y; Liu, JH; Liu, LW(刘立伟); Chen, W(陈韦); Zhang, YG(张跃钢)
刊名	ELECTROCHIMICA ACTA
	2016
卷号	219
通讯作者	Lu, L ; Zhang, YG(张跃钢) ; Liu, JH
英文摘要	Manipulating structure of graphene and its aggregates has been found to be important for graphene based supercapacitor performance enhancement. However, seldom work has investigated impact of graphene size on its energy storage performance. In this work we have tailored size of graphene oxide from micrometers to tens of nanometers via sonochemical approach. The converted graphene by thermal annealing graphene oxides of different size have been used as electrode materials for constructing supercapacitor with electrolyte of ionic liquid. Electrochemical analysis indicates that there is no obviously positively correlation between energy storage performance and structure characters (specific surface area and electrochemical active edge sites) of graphene, which is contrary to our common knowledge. Based on structure and electrochemical analysis of graphene electrodes, we proposed that reducing the size of graphene results in low edge activity of it for the disrupted aromatic structure on the edges with enriched sp3-carbon defects, where electrical charge is hard to transfer to and through. The practical available area for double layer capacitance setup does not include these electrical charge inaccessible edge regions if the size of graphene is very small. And thus increasing edges of small size graphene has no positive impact on its capacitance enhancement. Furthermore, structure of graphene has shown key influence on equivalent series resistance of bulk electrode. Increased charge transfer frequency between graphene layers of size reduced graphene and higher charge transfer resistance between layers of graphene with increased defective edge were attributed to reduced power density of electrode of graphene with reduced size. (C) 2016 Elsevier Ltd. All rights reserved.
关键词[WOS]	DOPED GRAPHENE ; GRAPHITE OXIDE ; ULTRACAPACITORS ; FABRICATION ; SHEET ; DENSE ; CAPACITOR ; NETWORKS ; CARBONS
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000386656700051
内容类型	期刊论文
源URL	[http://ir.sinano.ac.cn/handle/332007/4758]
专题	苏州纳米技术与纳米仿生研究所_纳米研究国际实验室_张跃钢团队
推荐引用方式 GB/T 7714	Lu, L,Li, WF,Zhou, LS,et al. Impact of size on energy storage performance of graphene based supercapacitor electrode[J]. ELECTROCHIMICA ACTA,2016,219.
APA	Lu, L.,Li, WF.,Zhou, LS.,Zhang, YJ.,Zhang, Z.,...&Zhang, YG.(2016).Impact of size on energy storage performance of graphene based supercapacitor electrode.ELECTROCHIMICA ACTA,219.
MLA	Lu, L,et al."Impact of size on energy storage performance of graphene based supercapacitor electrode".ELECTROCHIMICA ACTA 219(2016).