Metal-organic frameworks induced robust layered Co(OH)(2) nanostructures for ultra-high stability hybrid supercapacitor electrodes in aqueous electrolyte

doi:10.1016/j.jpowsour.2020.228974

	Metal-organic frameworks induced robust layered Co(OH)(2) nanostructures for ultra-high stability hybrid supercapacitor electrodes in aqueous electrolyte
	Li, Xu 1,2; Lu, Li 3; Shen, Jun 2; Li, Zhenhu 1; Liu, Shuangyi 1
刊名	JOURNAL OF POWER SOURCES
	2020-11-30
卷号	477 页码:9
关键词	Co(OH)(2) Interlayer spacing Cycle stability Pseudocapacitive behavior Hybrid supercapacitor
ISSN号	0378-7753
DOI	10.1016/j.jpowsour.2020.228974
通讯作者	Li, Zhenhu(lizhenhu@cigit.ac.cn) ; Liu, Shuangyi(liushuangyi@cigit.ac.cn)
英文摘要	Comparing with intensively studied alpha-Co(OH)(2) with applying on hybrid supercapacitors, alpha-Co(OH)(2) is believed to possess higher electrochemical energy storage performances because of its larger interlayer spacing. However, alpha-phase is always transforming to beta-phase when subject to successive charge-discharge processes with resulting in fast degradation in electrochemical performance. Here, by controlling ZIF-67 hydrolysis with appropriate pH regulating additives, the robust alpha-Co(OH)(2)-A nanostructures are obtained with excellent electrochemical energy storing performances, which present higher specific capacity of 87.1 mAh g(-1)- at 1 A g(-1), excellent rate capability of 77% capacity retention at 20 A g(-1)- and ultra-high cycle stability of over 100% capacity retention over 200, 000 charge-discharge cycles. Through detailed characterizations, such great enhancement is mainly due to the synergistically achieving interlayer crystal water and non-stoichiometric valence states with stable larger interlayer spacing on the robust layered nanostructures. Moreover, the present study also confirms that, instead of most understanding of H+ (de)intercalation, OH- ions significant contributing to pseudocapacitive storage through inserting and reacting with H+ of crystal water and alpha-Co(OH)(2). Thus, the present simple strategy with clear understanding to the energy storage mechanism is beneficial for designing and fabricating mass producible electrode materials of hybrid supercapacitors.
资助项目	National Natural Science Foundation of China[21875245] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2020380] ; Science and Technology Service Network Plan[KFJ-STS-SCYD-308] ; Key Project of Application Development Plan of Chongqing City[Cstc2019jscx-fxydX0007]
WOS研究方向	Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000582488600035
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/12351]
专题	中国科学院重庆绿色智能技术研究院
通讯作者	Li, Zhenhu; Liu, Shuangyi
作者单位	1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing Key Lab Multiscale Mfg Technol, Chongqing 400714, Peoples R China 2.Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Mech Transmiss, Chongqing 400044, Peoples R China 3.Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore
推荐引用方式 GB/T 7714	Li, Xu,Lu, Li,Shen, Jun,et al. Metal-organic frameworks induced robust layered Co(OH)(2) nanostructures for ultra-high stability hybrid supercapacitor electrodes in aqueous electrolyte[J]. JOURNAL OF POWER SOURCES,2020,477:9.
APA	Li, Xu,Lu, Li,Shen, Jun,Li, Zhenhu,&Liu, Shuangyi.(2020).Metal-organic frameworks induced robust layered Co(OH)(2) nanostructures for ultra-high stability hybrid supercapacitor electrodes in aqueous electrolyte.JOURNAL OF POWER SOURCES,477,9.
MLA	Li, Xu,et al."Metal-organic frameworks induced robust layered Co(OH)(2) nanostructures for ultra-high stability hybrid supercapacitor electrodes in aqueous electrolyte".JOURNAL OF POWER SOURCES 477(2020):9.