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Iron‑vanadium oxysulfide nanostructures as novel electrode materials for supercapacitor applications

Asen, P ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jelechem.2018.04.035
  3. Publisher: Elsevier B.V , 2018
  4. Abstract:
  5. Iron‑vanadium oxysulfide (Fe-VO-S) nanostructures with different Fe:VO atomic ratios are synthesized by a facile and low cost electrochemical deposition method. The synthesis of the various samples is confirmed by the physicochemical characterizations such as Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM). For different Fe-VO-S nanostructures, the correlation between the physicochemical and the electrochemical properties is investigated. It is found that the Fe:VO atomic ratio has an important effect on the structure and size of the resulted particles. Also, the morphology of Fe-VO-S nanostructures has a remarkable influence on the electrochemical performance of the prepared samples. In addition, ternary Fe-VO-S nanostructures show better electrochemical performances compared to binary VO-S, in terms of high specific capacitance value and good cycling stability, because of the combined contributions from both of Fe and VO elements in the ternary nanostructures. Especially, the as-prepared Fe-VO-S nanostructure with Fe:VO molar ratio of 2:1 shows the highest specific capacitance value of 217 F g−1 at a current density of 3 A g−1 and also exhibits good cycling stability with 92% capacitance retention at a current density of 5 A g−1 after 4000 cycles. In addition, the Fe-VO-S nanostructure with the mentioned molar ratio of Fe:VO can be successfully applied to assemble a symmetric supercapacitor device and achieves good capacitive performances with a high specific capacitance (117 F g−1 at 3 A g−1), excellent energy density (9.3 Wh kg−1 at 2200 W kg−1) and power density (7200 W kg−1 at 1.2 Wh kg−1). © 2018 Elsevier B.V
  6. Keywords:
  7. Iron-vanadium nanostructures ; Atomic force microscopy ; Capacitance ; Electrochemical deposition ; Electrodeposition ; Electrodes ; Energy dispersive spectroscopy ; Fourier transform infrared spectroscopy ; Nanostructures ; Reduction ; Scanning electron microscopy ; Supercapacitor ; Vanadium compounds ; X ray diffraction ; Electrochemical deposition methods ; Electrochemical performance ; Energy dispersive X ray spectroscopy ; Fourier transform infra red (FTIR) spectroscopy ; High specific capacitances ; Oxysulfides ; Physico-chemical characterization ; Supercapacitor application ; Iron compounds
  8. Source: Journal of Electroanalytical Chemistry ; Volume 818 , 2018 , Pages 157-167 ; 15726657 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S1572665718302893?via%3Dihub