title: Indirect growth of mesoporous Bi@C core-shell nanowires for enhanced lithium-ion storage.
abstract: In this paper, we propose a facile synthetic strategy for uniform bismuth@carbon (Bi@C) core-shell nanowires, which are prepared via controlled pyrolysis of Bi2S3@glucose-derived carbon-rich polysaccharide (GCP) nanowires under an inert atmosphere. Carbonization of GCP and pyrolysis of Bi2S3 into Bi occur at 500 °C and 600 °C, respectively, which increase the specific surface area and the pore volume of the nanowires, thus allowing accommodation of more lithium ions. Meanwhile, the carbon shell serves as a buffer layer to relieve large volume expansion-contraction during the electrochemical alloy formation, and can also efficiently reduce the aggregation of the nanowires. As a proof-of-concept, the Bi@C core-shell nanowire anodes manifest enhanced cycling stability (408 mA h g(-1) after 100 cycles at a current density of 100 mA g(-1)) and rate capacity (240 mA h g(-1) at a current density of 1 A g(-1)), much higher than pure bismuth microparticles and corresponding Bi2S3@C nanowires.
authors.affiliation: Laboratory of Advanced Materials, Department of Chemistry, Fudan University, Shanghai 200433, People's Republic of China. gfzheng@fudan.edu.cn.
authors.forename: Rui
authors.initials: R
authors.lastname: Dai
authors.forename: Yuhang
authors.initials: Y
authors.lastname: Wang
authors.forename: Peimei
authors.initials: P
authors.lastname: Da
authors.forename: Hao
authors.initials: H
authors.lastname: Wu
authors.forename: Ming
authors.initials: M
authors.lastname: Xu
authors.forename: Gengfeng
authors.initials: G
authors.lastname: Zheng