中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 金属研究所
  3. 中国科学院金属研究所
Graphene with KI-modified pore structure and its electrochemical capacitors application

文献类型：期刊论文

作者Luo, Ming-yu2,3; Xu, Ruo-gu2,3; Shi, Ying2,3; Wang, Yu-zuo1; Feng, Li2,3
刊名NEW CARBON MATERIALS
出版日期2023-04-01
卷号38期号:2页码:317-325
关键词Potassium iodide Capillary densification Electrochemical capacitors Volumetric energy density
ISSN号2097-1605
DOI10.1016/S1872-5805(23)60714-0
通讯作者Wang, Yu-zuo(wangyuzuo@nbu.edu.cn) ; Feng, Li(fli@imr.ac.cn)
英文摘要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.
资助项目National Natural Science Foundation of China[22078164]
WOS研究方向Materials Science
语种英语
WOS记录号WOS:001022844700001
出版者ELSEVIER
资助机构National Natural Science Foundation of China
源URL[http://ir.imr.ac.cn/handle/321006/178540]  
专题金属研究所_中国科学院金属研究所
通讯作者Wang, Yu-zuo; Feng, Li
作者单位1.Ningbo Univ, Inst Adv Energy Storage Technol & Equipment, Ningbo 315211, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, 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.

入库方式： OAI收割

来源：金属研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。