Journal
SMALL
Volume 10, Issue 4, Pages 766-773Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201302224
Keywords
metal sulfides; nanowire arrays; ion exchange; electrochemical energy storage; pseudocapacitors
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Funding
- SERC [1121202012]
- Agency for Science, Technology, and Research (A*STAR)
- Singapore MOE under AcRF Tier 2 [ARC 26/13, MOE2013-T2-1-034]
- Singapore MOE under AcRF Tier 1 [RG 61/12]
- NTU [M4080865]
- Singapore National Research Foundation
- Campus for Research Excellence And Technological Enterprise (CREATE) programme (Nanomaterials for Energy and Water Management)
- Singapore-France MERLION Programme [2.04.11]
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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.
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