Ternary nanostructures of Cr2O3/graphene oxide/conducting polymers for supercapacitor application

Asen, P ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jelechem.2018.06.048
  3. Abstract:
  4. In this work, nanostructured composites of Cr2O3-graphene oxide (Cr2O3/GO) with conducting polymers; polyaniline (PANI) and polypyrrole (PPy) with the shape of cauliflower were synthesized via s simple and low cost one-step chronoamperometry method. The structures and morphologies of the resulting ternary nanocomposites were characterized by using Fourier transform infrared spectroscopy, X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The electrochemical capacitive properties of the prepared nanocomposites were evaluated by using cycle voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The as-synthesized Cr2O3/GO/PANI and Cr2O3/GO/PPy composites exhibit a highest specific capacitance of 525 and 495 F g−1 at 5 A g−1 in the three-electrode tests, respectively. Interestingly, Cr2O3/GO/PANI and Cr2O3/GO/PPy composites retain 84 and 80% of their initial capacitance values after 4000 charge-discharge cycles, suggesting good electrochemical stability of the nanocomposite electrodes. The assembled symmetric devices based on Cr2O3/GO/PANI and Cr2O3/GO/PPy composites show a high specific capacitance of 263 and 100 F g−1 at the current density of 5 A g−1, respectively. © 2018 Elsevier B.V
  5. Keywords:
  6. Chromium oxide ; Polypyrrole ; Ternary composite ; Capacitance ; Chromium compounds ; Chronoamperometry ; Conducting polymers ; Electric discharges ; Electrochemical impedance spectroscopy ; Energy dispersive spectroscopy ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Graphene ; Graphene oxide ; Nanocomposites ; Polyaniline ; Polypyrroles ; Scanning electron microscopy ; Supercapacitor ; Chromium oxides ; Electrochemical stabilities ; Energy dispersive x ray spectroscopy ; Field emission scanning electron microscopy ; Galvanostatic charge discharges ; High specific capacitances ; Supercapacitor application ; Ternary composites ; Electrochemical electrodes
  7. Source: Journal of Electroanalytical Chemistry ; Volume 823 , 2018 , Pages 505-516 ; 15726657 (ISSN)
  8. URL: https://www.sciencedirect.com/science/article/pii/S1572665718304624