Epitaxial Growth of Urchin‐Like CoSe2 Nanorods from Electrospun Co‐Embedded Porous Carbon Nanofibers and Their Superior Lithium Storage Properties. (5th September 2017)

• Record Type: Journal Article
• Authors: Wang, Jinkai; Wang, Hongkang; Cao, Daxian; Lu, Xuan; Han, Xiaogang; Niu, Chunming
• Is Part Of: Particle and particle systems characterization. Volume 34:Number 10(2017:Oct.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-09-05
• Subjects: epitaxial growth -- hydrothermal selenation -- lithium storage properties -- porous graphitic CNFs -- urchin‐like CoSe2 nanorods; Particles -- Periodicals; 620.43
• DOI: 10.1002/ppsc.201700185
• Languages: English
• ISSNs: 0934-0866

Abstract

Abstract: A facile synthesis of porous graphitic carbon nanofibers (CNFs) with encapsulated Co nanoparticles (denote as Co@CNFs) via electrospinning and subsequent annealing is reported. The in situ generated Co nanoparticles (NPs) promote the CNF graphitization under a low temperature of 700 °C, which simultaneously results in the porous structure of the Co@CNFs with a large surface area (416 m 2 g −1 ). Furthermore, urchin‐like CoSe2 nanorods are epitaxially grown from the Co@CNFs via a facile hydrothermal selenation, in which the embedded Co NPs serve as directing seeds and sacrificial Co‐source, and CoSe2 nanorods are rooted into the CNFs (denote as CoSe2 @CNFs). When used as anode materials for lithium ion batteries, the CoSe2 @CNFs demonstrate superior lithium storage properties, delivering a high reversible capacity of 1405 mA h g −1 after 300 cycles at a current density of 200 mA g −1 . The enhanced lithium storage performance can be attributed to the novel hybrid structure, namely, the porous and graphitic CNFs can not only facilitate the charge/ion transfer but also buffer the volume changes of the electrode during lithiation/delithiation processes. More importantly, a general strategy is provided to graphitize amorphous carbon materials via the use of in situ generated transition metal nanoparticles as catalyst. Abstract : Porous graphitic carbon nanofibers with encapsulated Co nanoparticles (Co@CNFs) are prepared via electrospinning and subsequent annealing at a relatively low temperature (700 °C). Furthermore, urchin‐like CoSe2 nanorods are epitaxially grown from the Co@CNFs via a facile hydrothermal selenation method, in which the Co nanoparticles serve as Co source and CoSe2 seeds. Their lithium storage properties are also investigated.