A metal-organic framework-derived pseudocapacitive titanium oxide/carbon core/shell heterostructure for high performance potassium ion hybrid capacitors

doi:10.1039/d0ta04912c

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	A metal-organic framework-derived pseudocapacitive titanium oxide/carbon core/shell heterostructure for high performance potassium ion hybrid capacitors
	Li, Hongxia 2,3,4; Chen, Jiangtao 2; Zhang, Li 2; Wang, Kunjie 4; Zhang, Xu 2; Yang, Bingjun 2,3; Liu, Lingyang 2,3; Liu, Weisheng 5; Yan, Xingbin 1,2,3
	2020-08-28
关键词	Anodes Buffer storage Cathodes Energy storage Ions Metal-Organic Frameworks Organometallics Oxide minerals Potassium Sulfur compounds Supercapacitor Titanium dioxideCore-shell heterostructure Cyclotriphosphazenes Electrode material High energy densities Potential windows Pseudocapacitive Reversible insertion Volume variation
卷号	8
期号	32
DOI	10.1039/d0ta04912c
页码	16302-16311
英文摘要	For the emerging potassium-ion energy storage technology, the major challenge is seeking suitable electrode materials with a robust structure and fast kinetics for the reversible insertion/desertion of potassium ions. Here, a pseudocapacitive core-shell heterostructure of titanium oxide/carbon confined into N, P, and S co-doped carbon (TiO2/C@NPSC) is obtained by pyrolyzing a metal-organic framework (MOF) precursor of MIL-125 (Ti) modified by poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) polymer. The distinctive structure of TiO2/C@NPSC can effectively buffer the volume variation of TiO2 nano-grains during the charge/discharge process, increase the electron/charge transfer, provide abundant active sites, and boost the pseudocapacitive-dominated K+-storage. Consequently, the TiO2/C@NPSC anode displays superior cyclability and fast kinetics behavior. Upon integrating it with a high capacitance activated carbon cathode derived from another MOF precursor, the as-built potassium-ion hybrid capacitor achieves a high-energy density of 114 W h kg-1 and a power output of 21 kW kg-1. Moreover, in a wide working potential window of 0-4.2 V, the device also maintains over 91.6% of its initial capacity after 10 000 cycles, showing a superior cycle stability. Our results are conducive to understanding the importance of anode-engineering for designing advanced PIHCs. This journal is © The Royal Society of Chemistry.
会议录	Journal of Materials Chemistry A
会议录出版者	Royal Society of Chemistry
语种	英语
ISSN号	20507488
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
WOS记录号	WOS:000561168500015
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132684]
专题	石油化工学院
作者单位	1.Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian; 116000, China 2.Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou; 730000, China; 3.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing; 100049, China; 4.School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 5.College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou; 730000, China;
推荐引用方式 GB/T 7714	Li, Hongxia,Chen, Jiangtao,Zhang, Li,et al. A metal-organic framework-derived pseudocapacitive titanium oxide/carbon core/shell heterostructure for high performance potassium ion hybrid capacitors[C]. 见:.