Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors

doi:10.1039/c4ta02026j

	Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors
	Sun, Shixiong 2,3; Lang, Junwei 2; Wang, Rutao 2; Kong, Lingbin 3; Li, Xiaocheng 2; Yan, Xingbin 1,2
刊名	JOURNAL OF MATERIALS CHEMISTRY A
	2014
卷号	2 期号:35 页码:14550-14556
关键词	Activated carbon Alkalinity Electrochemical electrodes Electrolytes Ionic liquids Nanorods Polyaniline Redox reactions Supercapacitor Surface reactions Transition metal oxides Transition metals 1-ethyl-3-methylimidazolium tetrafluoroborate Alkaline aqueous electrolytes Asymmetric supercapacitor Charging/discharging Commercial activated carbons High energy densities Pseudocapacitive behavior Reversible redox reactions
ISSN号	2050-7488
DOI	10.1039/c4ta02026j
英文摘要	Pseudocapacitance is commonly associated with surface or near-surface reversible redox reactions, as observed with transition metal oxides in alkaline aqueous electrolytes. Here, we demonstrate that pseudocapacitive behavior of Fe2O3 can occur in a 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) ionic liquid (IL), and it is closely related to the chemical state variation between Fe3+ and Fe2+ on the surface of a Fe2O3 electrode during the charging/discharging process. By taking advantage of such pseudocapacitance, we prepared a promising electrode material, i.e., graphene nanosheet-supported Fe2O3 nanoparticles (denoted as Fe2O3@GNS), and then built high-performance asymmetric supercapacitors (ASs) using Fe2O3@GNS as the battery-type electrode material, commercial activated carbon (AC)/or activated polyaniline-derived carbon nanorods (denoted as APDC) as the capacitor-type electrode material, and EMIMBF4 IL as the electrolyte. The as-made ASs are able to work reversibly in a full operation voltage region of 0-4 V and exhibit very high energy density. Especially, the AS of Fe2O3@GNS//APDC achieves an extremely high energy density of 177 W h kg(-1) and shows a superior combination of high energy and power density (the energy density still remains 62.4 W h kg(-1) even at a high power density of 8 kW kg(-1)).
资助项目	National Nature Science Foundations of China[21203223] ; National Nature Science Foundations of China[21303234]
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000340768000030
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34549]
专题	能源与动力工程学院材料科学与工程学院
通讯作者	Yan, Xingbin
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, Lanzhou 730000, Peoples R China 3.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Sun, Shixiong,Lang, Junwei,Wang, Rutao,et al. Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors[J]. JOURNAL OF MATERIALS CHEMISTRY A,2014,2(35):14550-14556.
APA	Sun, Shixiong,Lang, Junwei,Wang, Rutao,Kong, Lingbin,Li, Xiaocheng,&Yan, Xingbin.(2014).Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors.JOURNAL OF MATERIALS CHEMISTRY A,2(35),14550-14556.
MLA	Sun, Shixiong,et al."Identifying pseudocapacitance of Fe2O3 in an ionic liquid and its application in asymmetric supercapacitors".JOURNAL OF MATERIALS CHEMISTRY A 2.35(2014):14550-14556.