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One pot and large-scale synthesis of nanostructured metal sulfides: Synergistic effect on supercapacitor performance

Author

Listed:
  • C Karthikeyan
  • R Dhilip Kumar
  • J Anandha Raj
  • S Karuppuchamy

Abstract

Metal sulfides received key interest as an electrode material for storage and conversion of energy. Here, the novel nanostructured N 17 S 18 and (CoNi) 3 S 4 materials were synthesized via one-step hydrothermal method, and the synergistic effect of metal ions and electrochemical properties was investigated. A new and simple solution growth technique was employed in this work. The prepared nanopowders were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy techniques. The X-ray diffraction analysis of the prepared nanopowder revealed the formation of cubic phase cobalt nickel sulfides (CoNi) 3 S 4 and hexagonal phase nickel sulfides (Ni 17 S 18 ). Scanning electron microscopy analysis display fibrous, flakes and sheet-like morphology for Co x S x , N 17 S 18 and (CoNi) 3 S 4 , respectively. Fibrous and sheet-like morphology exhibits higher electrochemical performance in supercapacitors. The electrochemical behavior of the amorphous Co x S x , crystallite Ni 17 S 18 and (CoNi) 3 S 4 modified electrodes was investigated using electrochemical impedance spectroscopy, cyclic voltammetry and galvanostatic charge–discharge techniques. The specific capacitance of 57 F/g and 31 F/g were obtained for the amorphous Co x S x and crystalline (CoNi) 3 S 4 powder, respectively. Amorphous Co x S x modified electrode retains 76% of initial capacitance after 1000 repeated cycling process. These results of this study suggest that the Co x S x and crystalline (CoNi) 3 S 4 are appropriate materials for supercapacitor applications.

Suggested Citation

  • C Karthikeyan & R Dhilip Kumar & J Anandha Raj & S Karuppuchamy, 2020. "One pot and large-scale synthesis of nanostructured metal sulfides: Synergistic effect on supercapacitor performance," Energy & Environment, , vol. 31(8), pages 1367-1384, December.
  • Handle: RePEc:sae:engenv:v:31:y:2020:i:8:p:1367-1384
    DOI: 10.1177/0958305X19899373
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    References listed on IDEAS

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    1. Li-Qiang Mai & Fan Yang & Yun-Long Zhao & Xu Xu & Lin Xu & Yan-Zhu Luo, 2011. "Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance," Nature Communications, Nature, vol. 2(1), pages 1-5, September.
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