title: Synthesis of free-standing metal sulfide nanoarrays via anion exchange reaction and their electrochemical energy storage application.
abstract: Metal sulfides are an emerging class of high-performance electrode materials for solar cells and electrochemical energy storage devices. Here, a facile and powerful method based on anion exchange reactions is reported to achieve metal sulfide nanoarrays through a topotactical transformation from their metal oxide and hydroxide preforms. Demonstrations are made to CoS and NiS nanowires, nanowalls, and core-branch nanotrees on carbon cloth and nickel foam substrates. The sulfide nanoarrays exhibit superior redox reactivity for electrochemical energy storage. The self-supported CoS nanowire arrays are tested as the pseudo-capacitor cathode, which demonstrate enhanced high-rate specific capacities and better cycle life as compared to the powder counterparts. The outstanding electrochemical properties of the sulfide nanoarrays are a consequence of the preservation of the nanoarray architecture and rigid connection with the current collector after the anion exchange reactions.
authors.forename: Xinhui
authors.initials: X
authors.lastname: Xia
authors.forename: Changrong
authors.initials: C
authors.lastname: Zhu
authors.forename: Jingshan
authors.initials: J
authors.lastname: Luo
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Zeng
authors.forename: Cao
authors.initials: C
authors.lastname: Guan
authors.forename: Chin Fan
authors.initials: CF
authors.lastname: Ng
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Hong Jin
authors.initials: HJ
authors.lastname: Fan