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Synthesis of Free‐Standing Metal Sulfide Nanoarrays via Anion Exchange Reaction and Their Electrochemical Energy Storage Application
Author(s) -
Xia Xinhui,
Zhu Changrong,
Luo Jingshan,
Zeng Zhiyuan,
Guan Cao,
Ng Chin Fan,
Zhang Hua,
Fan Hong Jin
Publication year - 2014
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201302224
Subject(s) - materials science , electrochemistry , sulfide , energy storage , nanotechnology , nanowire , nickel sulfide , cathode , electrode , hydroxide , oxide , chemical engineering , inorganic chemistry , chemistry , metallurgy , power (physics) , physics , quantum mechanics , engineering
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 pre‐forms. 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.