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Ternary nickel cobalt iron sulfides ultrathin nanosheets grown on 3-D nickel nanocone arrays‑nickel plate current collector as a binder free electrode for fabrication of highly performance supercapacitors

Rahimi, S ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jelechem.2018.01.004
  3. Publisher: Elsevier B.V , 2018
  4. Abstract:
  5. The design of 3-dimensional (3-D) nanostructured materials on the novel current collectors has recently considered as a promising strategy for developing high-performance supercapacitors. Herein, in the first step, a novel 3-D nickel nanocone arrays (NCAs) are synthesized on the surface of nickel plate (NP) by a one-step electrodeposition method without using any template (NCAs-NP). Then, a simple and efficient method is developed for fabricating ternary metal sulfides electrodes based on the electrodeposition of nickel cobalt iron sulfide (Ni-Co-Fe-S) ultrathin nanosheets on the surface of NCAs-NP. Taking advantages of the unique flower like structure of Ni-Co-Fe-S ultrathin nanosheets and cluster structure of the three-dimensional NCAs, the ternary metal sulfide electrode (Ni-Co-Fe-S@NCAs-NP) exhibits high specific capacitances (2159.7 F/g at 7 A/g and 1461 F/g at 35 A/g) with excellent rate capabilities. An asymmetric supercapacitor is fabricated by applying the Ni-Co-Fe-S@NCAs-NP as the positive electrode and reduced graphene oxide coated on the nickel foam (rGO-NF) as the negative electrode, renders an excellent electrochemical performance for practical applications. Our asymmetric Ni-Co-Fe-S@NCAs-NP//rGO-NF supercapacitor showed a high energy density of 35.9 Wh kg− 1 at a power density of 375 W kg− 1 and even at power density of 7500, the energy density is still as high as 6.90 Wh kg− 1. © 2018
  6. Keywords:
  7. 3-D nickel nanocone arrays ; Asymmetric supercapacitors ; Nickel cobalt iron sulfide ; Cobalt ; Electric current collectors ; Electrochemical electrodes ; Electrodeposition ; Electrodes ; Fabrication ; Graphene ; Iron ; Iron compounds ; Nanosheets ; Nanostructures ; Nickel compounds ; Plates (structural components) ; Sulfur compounds ; Supercapacitor ; Asymmetric supercapacitor ; Electrochemical performance ; High specific capacitances ; Iron sulfide ; Metal-sulfide electrode ; Nanocone arrays ; One-step electrodepositions ; Ultrathin nanosheets ; Nickel
  8. Source: Journal of Electroanalytical Chemistry ; Volume 810 , 2018 , Pages 78-85 ; 15726657 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1572665718300079