Graphene with KI-modified pore structure and its electrochemical capacitors application

doi:10.1016/S1872-5805(23)60714-0

IMR OpenIR

	Graphene with KI-modified pore structure and its electrochemical capacitors application
	Luo, Ming-yu 1,2; Xu, Ruo-gu 1,2; Shi, Ying 1,2; Wang, Yu-zuo 3; Feng, Li 1,2
通讯作者	Wang, Yu-zuo(wangyuzuo@nbu.edu.cn) ; Feng, Li(fli@imr.ac.cn)
	2023-04-01
发表期刊	NEW CARBON MATERIALS
ISSN	2097-1605
卷号	38 期号:2 页码:317-325
摘要	The use of electrochemical capacitors is greatly limited by their poor volumetric energy density, and the key for improving it is to develop porous yet compact carbon materials. In recent years, the densification of porous carbons by capillary forces during drying has been used as a main method to balance the density and porosity of porous carbons for high volumetric performance. But there are still deficiencies in fine tuning the pore structure, which limits the compatibility of porous carbons with high-voltage ionic liquids. We report a KI-assisted method to prepare graphene-based porous carbons with high density and high capacitance. During the synthesis of the carbons, graphene oxide was dispersed in KI solutions with concentrations of 12.5-37.5 mmol/mL followed by hydrothermal treatment at 180 degrees C for 6 h. The obtained hydrogels were dried in 0.01 MPa of air at 60 degrees C for 72 h. By this procedure, KI was loaded into a matrix of compact graphene and formed crystals to suppress over shrinkage of pores during drying to produce densification and pseudo-capacitance. Electrochemical characterization of the resulting materials indicated that the ion-accessible surface area and pseudo-capacitance of the porous carbons were increased. The KI/graphene composite with an optimum concentration of KI of 25 mmol/mL achieved both a high electrode density of 0.96 g cm(-3) and a high volumetric capacitance of 115 F cm(-3) (at 1 A g(-1)) in an ionic liquid electrolyte (1-alkyl-3-methylimidazolium tetrafluoroborate). A symmetric cell assembled using this material had a high volumetric energy density of 19.6 Wh L-1.
关键词	Potassium iodide Capillary densification Electrochemical capacitors Volumetric energy density
资助者	National Natural Science Foundation of China
DOI	10.1016/S1872-5805(23)60714-0
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[22078164]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:001022844700001
出版者	ELSEVIER
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/178541
专题	中国科学院金属研究所
通讯作者	Wang, Yu-zuo; Feng, Li
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Ningbo Univ, Inst Adv Energy Storage Technol & Equipment, Ningbo 315211, Peoples R China
推荐引用方式 GB/T 7714	Luo, Ming-yu,Xu, Ruo-gu,Shi, Ying,et al. Graphene with KI-modified pore structure and its electrochemical capacitors application[J]. NEW CARBON MATERIALS,2023,38(2):317-325.
APA	Luo, Ming-yu,Xu, Ruo-gu,Shi, Ying,Wang, Yu-zuo,&Feng, Li.(2023).Graphene with KI-modified pore structure and its electrochemical capacitors application.NEW CARBON MATERIALS,38(2),317-325.
MLA	Luo, Ming-yu,et al."Graphene with KI-modified pore structure and its electrochemical capacitors application".NEW CARBON MATERIALS 38.2(2023):317-325.