A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate

doi:10.1039/c8sc04489a

	A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate
	Luo, Yuwen 1,2; Liu, Luojia 2; Lei, Kaixiang 2; Shi, Jifu 3; Xu, Gang 1; Li, Fujun 2; Chen, Jun 2
刊名	CHEMICAL SCIENCE
	2019-02-21
卷号	10 期号:7 页码:2048-2052
ISSN号	2041-6520
DOI	10.1039/c8sc04489a
通讯作者	Shi, Jifu(shijifu2017@126.com) ; Li, Fujun(fujunli@nankai.edu.cn)
英文摘要	Nonaqueous potassium-ion hybrid capacitors (KIHCs) are faced with limited redox reaction kinetics of electrodes for accommodation of large-sized K+. Here, dipotassium terephthalate (K2TP) is applied as an organic negative electrode to provide comparable reaction kinetics with a non-faradaic activated carbon (AC) positive electrode to boost the electrochemical performance of KIHCs. It is revealed that the large exchange current density and fast two-dimensional (2D) diffusion pathways of K+ in K2TP determined by density functional theory (DFT) calculations ensure its fast redox reaction and transport kinetics. The asconstructed KIHC presents both high energy and power densities of 101 W h kg(-1) and 2160 W kg(-1) based on the mass of the two electrodes (41.5 W h kg(-1) and 885.2 W kg(-1) based on the mass of the two electrodes and electrolyte), respectively, and a superior capacity retention of 97.7% after 500 cycles. The excellent electrochemical performance is attributed to the fast kinetics, good structural flexibility, and small volume change (9.4%) of K2TP upon K+ insertion/extraction, and its good compatibility with the AC positive electrode in 1,2-dimethoxyethane (DME)-based electrolyte. This will promote application of organic materials in hybrid capacitors and the development of KIHCs.
资助项目	National Natural Science Foundation of China[21603108] ; National Natural Science Foundation of China[21673243] ; Fundamental Funds for the Central Universities ; NSFC-RGC Joint Program[51761165025]
WOS关键词	ELECTRODES ; NANOWIRES ; ANODES
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000458907300013
资助机构	National Natural Science Foundation of China ; Fundamental Funds for the Central Universities ; NSFC-RGC Joint Program
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/24542]
专题	中国科学院广州能源研究所
通讯作者	Shi, Jifu; Li, Fujun
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China 2.Nankai Univ, Coll Chem, Key Lab Adv Energy Mat Chem, Minist Educ, Tianjin 300071, Peoples R China 3.Jinan Univ, Dept Phys, Siyuan Lab, Guangzhou 510632, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Luo, Yuwen,Liu, Luojia,Lei, Kaixiang,et al. A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate[J]. CHEMICAL SCIENCE,2019,10(7):2048-2052.
APA	Luo, Yuwen.,Liu, Luojia.,Lei, Kaixiang.,Shi, Jifu.,Xu, Gang.,...&Chen, Jun.(2019).A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate.CHEMICAL SCIENCE,10(7),2048-2052.
MLA	Luo, Yuwen,et al."A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate".CHEMICAL SCIENCE 10.7(2019):2048-2052.