High-Energy MnO(2) Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors

IMR OpenIR

	High-Energy MnO(2) Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors
	Z. S. Wu; W. C. Ren; D. W. Wang; F. Li; B. L. Liu; H. M. Cheng
	2010
发表期刊	Acs Nano
ISSN	1936-0851
卷号	4 期号:10 页码:5835-5842
摘要	In order to achieve high energy and power densities, we developed a high-voltage asymmetric electrochemical capacitor (EC) based on graphene as negative electrode and a MnO(2) nanowire/graphene composite (MGC) as positive electrode in a neutral aqueous Na(2)SO(4) solution as electrolyte. MGC was prepared by solution-phase assembly of graphene sheets and alpha-MnO(2) nanowires. Such aqueous electrolyte-based asymmetric ECs can be cycled reversibly in the high-voltage region of 0-2.0 V and exhibit a superior energy density of 30.4 Wh kg(-1), which is much higher than those of symmetric ECs based on graphene//graphene (2.8 Wh kg(-1)) and MGC//MGC (5.2 Wh kg(-1)). Moreover, they present a high power density (5000 W kg(-1) at 7.0 Wh kg(-1)) and acceptable cycling performance of similar to 79% retention after 1000 cycles. These findings open up the possibility of graphene-based composites for applications in safe aqueous electrolyte-based high-voltage asymmetric ECs with high energy and power densities.
部门归属	[wu, zhong-shuai; ren, wencai; li, feng; liu, bilu; cheng, hui-ming] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [wang, da-wei] univ queensland, arc ctr excellence funct nanomat, aibn, brisbane, qld 4072, australia.;ren, wc (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;wcren@imr.ac.cn cheng@imr.ac.cn
关键词	Graphene Manganese Oxide Composite Asymmetric Electrochemical Capacitor Activated Carbon Aqueous-electrolyte Composite Electrodes Manganese-dioxide Layer Capacitor 2 v Supercapacitors Storage Performance Intercalation
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31590
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. S. Wu,W. C. Ren,D. W. Wang,et al. High-Energy MnO(2) Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors[J]. Acs Nano,2010,4(10):5835-5842.
APA	Z. S. Wu,W. C. Ren,D. W. Wang,F. Li,B. L. Liu,&H. M. Cheng.(2010).High-Energy MnO(2) Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors.Acs Nano,4(10),5835-5842.
MLA	Z. S. Wu,et al."High-Energy MnO(2) Nanowire/Graphene and Graphene Asymmetric Electrochemical Capacitors".Acs Nano 4.10(2010):5835-5842.