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