Controlled Synthesis of Manganese Oxyhydroxide Nanotubes: Implications for High-Efficiency Supercapacitors

Authors

  • Hui Teng Tan,

    1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
    2. TUM CREATE Research Centre@NTU, 62 Nanyang Drive, Singapore 637459 (Singapore)
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  • Xianhong Rui,

    1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
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  • Wenhui Shi,

    1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
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  • Chen Xu,

    1. TUM CREATE Research Centre@NTU, 62 Nanyang Drive, Singapore 637459 (Singapore)
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  • Hong Yu,

    1. TUM CREATE Research Centre@NTU, 62 Nanyang Drive, Singapore 637459 (Singapore)
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  • Prof. Harry E. Hoster,

    1. TUM CREATE Research Centre@NTU, 62 Nanyang Drive, Singapore 637459 (Singapore)
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  • Prof. Qingyu Yan

    Corresponding author
    1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
    2. TUM CREATE Research Centre@NTU, 62 Nanyang Drive, Singapore 637459 (Singapore)
    • School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)

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Abstract

Successful attempts have been made to control the synthesis of tubular MnOOH with nanodimensions on high electronic conductivity graphite felt (GF) to be used as a flexible supercapacitor electrode. As a fundamental study, the time-dependent kinetics was investigated to interpret its formation mechanism, which can be depicted as the curling of a two-dimensional precursor into a one-dimensional structure with a hollow interior. As a result of the nanotube structure, the active surface area of MnOOH is completely accessible to electrolyte ions and has a shorter charge-transport length and greater ability to withstand structural deformation. Hence, hollow-structured MnOOH shows great promise as an electrochemical system, which is reflected in its high specific capacitance of 1156 F g−1 at 1 A g−1. Furthermore, the high energy density of 1125 W h kg−1 and power density of 5.05 kW kg−1 reveal the outstanding energy-storage behavior of the MnOOH/GF composites as flexible supercapacitor electrodes.

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