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Hydrothermal Synthesis and Pseudocapacitive Properties of Morphology Tuned Nickel Sulfide (NiS) Nanostructures

Abstract

Metal sulfides have fascinated considerable scrutiny compare to metal oxides owing to their distinguished electrochemical properties and various applications, such as solar cells and supercapacitors. We have reported the pseudocapacitive properties of morphology tuned NiS nanostructures using hydrothermal method at different deposition times and temperatures. The surface morphology, structure and chemical composition have been confirmed by SEM, TEM, XRD, XPS and EDS analyses. The optimized NiS-2 h electrode offer extra conductive paths on nickel foam, yielding a lower charge-transfer resistance and internal resistance than that of the NiS-1 h and NiS-3 h. Investigation of the electrochemical studies indicates that the NiS electrode exhibited a specific capacitance of 1073.8 F g-1 and 959 F g-1 at current densities of 1.2 and 2.4 A g-1 in KOH solution, indicating the potential to be used in practical applications. Moreover, it delivered a maximum energy density of 23.19 Wh kg-1 and a power density of 243.9 W kg-1 with an excellent cycling retention of 89% after 1000 charge-discharge cycles. This work also indicates an effective approach in fabricating high-performance electrodes in a cost-effective manner for greater energy density and power density applications, such as electric vehicles, flexible electronics and energy storage devices.

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Publication details

The article was received on 20 Dec 2017, accepted on 04 Jan 2018 and first published on 05 Jan 2018


Article type: Paper
DOI: 10.1039/C7NJ05054B
Citation: New J. Chem., 2018, Accepted Manuscript
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    Hydrothermal Synthesis and Pseudocapacitive Properties of Morphology Tuned Nickel Sulfide (NiS) Nanostructures

    B. Naresh, D. Punnoose, S. S. Rao, A. Subramanian, B. Raja Ramesh and H. Kim, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ05054B

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