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Hollow Nanospheres Constructed by CoS2 Nanosheets with a Nitrogen-Doped-Carbon Coating for Energy-Storage and Photocatalysis

Authors

  • Dr. Shengjie Peng,

    Corresponding author
    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
    • Shengjie Peng, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

      Seeram Ramakrishna, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117576 (Singapore)===

      Qingyu Yan, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

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  • Dr. Linlin Li,

    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
    2. TUM-CREATE Center for Electromobility, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 (Singapore)
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  • Prof. Dr. Subodh G. Mhaisalkar,

    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
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  • Madhavi Srinivasan,

    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
    2. TUM-CREATE Center for Electromobility, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 (Singapore)
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  • Prof. Seeram Ramakrishna,

    Corresponding author
    1. Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117576 (Singapore)
    • Shengjie Peng, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

      Seeram Ramakrishna, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117576 (Singapore)===

      Qingyu Yan, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

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  • Prof. Qingyu Yan

    Corresponding author
    1. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
    2. TUM-CREATE Center for Electromobility, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459 (Singapore)
    • Shengjie Peng, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

      Seeram Ramakrishna, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117576 (Singapore)===

      Qingyu Yan, School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)===

    Search for more papers by this author

Abstract

Hierarchical CoS2 hollow nanospheres (HSs) with a nitrogen-doped-carbon coating (NC@CoS2) are fabricated by a simple solution method. The uniform 300 nm-sized NC@CoS2 HSs are composed of ultrathin nanosheet subunits with a thickness of around 2 nm. It was found that polyvinylpyrrolidone and ethylenediamine not only controlled the morphology of the products, but also provided the sources of nitrogen-doped carbon. Benefiting from their unique structural characteristics, hierarchical NC@CoS2 HSs can be applied in lithium-ion batteries, supercapacitors, and photocatalysis. When evaluated as an electrode material, NC@CoS2 with a coating of optimal thickness showed a high lithium-storage capability with a good cycling stability. Moreover, NC@CoS2 had a remarkable supercapacitive performance and photocatalytic activity. The attractive electrochemical and photocatalytic performances were attributed to the overall structural features of the NC@CoS2 hollow spheres: the N-doped-carbon (NC) coating, hollow interior, and ultrathin nanosheets.

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