Synthesis of NiMoS4 for High-Performance Hybrid Supercapacitors

Dongwei Du, Rong Lan, John Humphreys, Wei Xu, Kui Xie, Huanting Wang, Shanwen Tao

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Transition metal sulfides have been suggested as promising materials for efficient energy storage with superior electrochemical performances. Compound NiMoS4-A was synthesized by a facile chemical co-precipitation process, followed by calcining at 450°C in Ar. The as-prepared NiMoS4-A electrode exhibits a high specific capacity of 313 C g−1 at 1 A g−1 and good rate capability (83% retention at 10 A g−1). Electrochemical impedance spectroscopy (EIS) results indicate that the good performances could be attributed to the low internal and charge transfer resistances. Additionally, the quantitative charge storage analysis reveals that the faradaic redox process dominates at lower scan rates (78% at 1 mV s−1), while the capacitive effect dominates at higher scan rates (56% at 20 mV s−1). Furthermore, a hybrid supercapacitor (HSC), with NiMoS4-A as the positive electrode and activated carbon (AC) as the negative electrode, displays a high energy density of 35 Wh kg−1 at an average power density of 400 W kg−1. Meanwhile, the HSC exhibits excellent cycle stability, maintaining 82% of the initial capacitance after 10000 charge-discharge cycles even at a high current density of 5 A g−1. These good electrochemical performances indicate that NiMoS4-A is a promising positive electrode material for hybrid supercapacitors.
    Original languageEnglish
    Pages (from-to)A2881-A2888
    Number of pages8
    JournalJournal of the Electrochemical Society
    Volume164
    Issue number12
    DOIs
    Publication statusPublished - 21 Sep 2017

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    Electrodes
    Sulfides
    Coprecipitation
    Electrochemical impedance spectroscopy
    Activated carbon
    Energy storage
    Transition metals
    Charge transfer
    Current density
    Capacitance
    Supercapacitor
    Oxidation-Reduction

    Keywords

    • NiMoS4
    • sulfide
    • supercapacitor

    Cite this

    Synthesis of NiMoS4 for High-Performance Hybrid Supercapacitors. / Du, Dongwei; Lan, Rong; Humphreys, John; Xu, Wei; Xie, Kui; Wang, Huanting; Tao, Shanwen .

    In: Journal of the Electrochemical Society, Vol. 164, No. 12, 21.09.2017, p. A2881-A2888.

    Research output: Contribution to journalArticle

    Du, D, Lan, R, Humphreys, J, Xu, W, Xie, K, Wang, H & Tao, S 2017, 'Synthesis of NiMoS4 for High-Performance Hybrid Supercapacitors' Journal of the Electrochemical Society, vol. 164, no. 12, pp. A2881-A2888. https://doi.org/10.1149/2.0071713jes
    Du, Dongwei ; Lan, Rong ; Humphreys, John ; Xu, Wei ; Xie, Kui ; Wang, Huanting ; Tao, Shanwen . / Synthesis of NiMoS4 for High-Performance Hybrid Supercapacitors. In: Journal of the Electrochemical Society. 2017 ; Vol. 164, No. 12. pp. A2881-A2888.
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    abstract = "Transition metal sulfides have been suggested as promising materials for efficient energy storage with superior electrochemical performances. Compound NiMoS4-A was synthesized by a facile chemical co-precipitation process, followed by calcining at 450°C in Ar. The as-prepared NiMoS4-A electrode exhibits a high specific capacity of 313 C g−1 at 1 A g−1 and good rate capability (83{\%} retention at 10 A g−1). Electrochemical impedance spectroscopy (EIS) results indicate that the good performances could be attributed to the low internal and charge transfer resistances. Additionally, the quantitative charge storage analysis reveals that the faradaic redox process dominates at lower scan rates (78{\%} at 1 mV s−1), while the capacitive effect dominates at higher scan rates (56{\%} at 20 mV s−1). Furthermore, a hybrid supercapacitor (HSC), with NiMoS4-A as the positive electrode and activated carbon (AC) as the negative electrode, displays a high energy density of 35 Wh kg−1 at an average power density of 400 W kg−1. Meanwhile, the HSC exhibits excellent cycle stability, maintaining 82{\%} of the initial capacitance after 10000 charge-discharge cycles even at a high current density of 5 A g−1. These good electrochemical performances indicate that NiMoS4-A is a promising positive electrode material for hybrid supercapacitors.",
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