气候变化领域集成服务门户(CCPortal): Carbon-coated WS2nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors

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DOI	10.1039/d1ee00193k
	Carbon-coated WS2nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors
	Geng S.; Zhou T.; Jia M.; Shen X.; Gao P.; Tian S.; Zhou P.; Liu B.; Zhou J.; Zhuo S.; Li F.
发表日期	2021
ISSN	17545692
起始页码	3184
结束页码	3193
卷号	14 期号:5
英文摘要	Potassium-ion capacitors (PICs) have received increasing attention because of their high energy/power densities and the abundance of potassium. However, achieving high-rate battery-type anodes to match the capacitor-type cathodes is still a great challenge. Herein, we design a freestanding anode by supporting carbon-coated WS2 nanosheets on carbon nanofibers (C-WS2@CNFs) for PICs. Benefiting from its unique nanostructure and the high purity of WS2, the C-WS2@CNFs anode exhibits a high reversible capacity of 319 mA h g-1 at 50 mA g-1 and a high rate performance of 168 mA h g-1 at 10 A g-1. An intercalation-conversion reaction mechanism with an intermediate phase of K2S5 is verified by in situ Raman, in situ XRD, and ex situ XRD and TEM. First-principles calculations confirm that the C-WS2@CNFs anode possesses fast K+ diffusion kinetics and a high K-adsorption ability. The potassium ion capacitor, assembled from the anode of C-WS2@CNFs and the cathode of activated carbon nanofibers, delivers a superior energy density up to 180.4 W h kg-1, a good rate capability, and a long cycle life. © 2021 The Royal Society of Chemistry.
英文关键词	Anodes; Calculations; Cathodes; Ions; Potassium; Reaction intermediates; Tungsten compounds; X ray diffraction; Conversion reactions; Diffusion kinetics; First-principles calculation; High rate batteries; High reversible capacities; High-rate performance; Intermediate phase; Rate capabilities; Carbon nanofibers; activated carbon; carbon nanotube; detection method; electrode; equipment; inorganic compound; performance assessment; reaction kinetics
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190677
作者单位	School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo, 255049, China; School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China
推荐引用方式 GB/T 7714	Geng S.,Zhou T.,Jia M.,et al. Carbon-coated WS2nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors[J],2021,14(5).
APA	Geng S..,Zhou T..,Jia M..,Shen X..,Gao P..,...&Li F..(2021).Carbon-coated WS2nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors.Energy & Environmental Science,14(5).
MLA	Geng S.,et al."Carbon-coated WS2nanosheets supported on carbon nanofibers for high-rate potassium-ion capacitors".Energy & Environmental Science 14.5(2021).