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Synthesis and Characterization of 3D Reduced Graphene Oxide with Phosphorus and Nitrogen Dopants as an Efficient Supercapacitor Electrode Material

Nazari, Neda | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55453 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Malek Khachatourian, Adrineh
  7. Abstract:
  8. Supercapacitors are safe and environmentally friendly energy storage devices that have been considered for their diverse applications. One of the most important factors that control supercapacitors' capacity is the electrode material's structure and properties. Adding heteroatoms or composite materials synthesis is one way to improve electrode performance. In this study, a facile, fast, and economical hydrothermal method was used to synthesize N doped, P doped or N/P co-doped 3D reduced graphene oxide (rGO) for high-performance supercapacitor application. Nitrogen and phosphorus elements were replaced by carbon atoms simultaneously during the graphene oxide hydrothermal reduction procedure. The effect of N and P dopants on structural and microstructural properties were evaluated using X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) equipped with Energy dispersive x-ray spectroscopy (EDS), FT-IR, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Moreover, the electrochemical properties were investigated by cyclic voltammetric (CV) analyses, electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge (GCD). The specific capacitance of 3D rGO, 3D NrGO, 3D PrGO, and 3D N/PrGO on Ni foam reached 281, 569.4, 430, and 480F g-1 at 5mV s-1, respectively, in the presence of the voltage range of -0.6 –0.6 V (vs. Ag/AgCl) using 6M KOH as the electrolyte. The appreciable performances are primarily due to the cooperative effect of the porous structure of N/P doped 3DrGO and pseudocapacitive property of N and P, which provides appropriate electroactive sites and simplifies the ion/electron transfer for the electrochemical processes
  9. Keywords:
  10. Supercapacitor ; Electrical Conductivity ; Reduced Graphene Oxide ; Dopants ; Supercapacitor Electrode

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