Facile synthesis of N-doped hollow carbon nanospheres wrapped with transition metal oxides nanostructures as non-precious catalysts for the electro-oxidation of hydrazine

Taghaddosi, S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jelechem.2020.114437
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. In the present work, N-doped hollow carbon nanospheres (N-HCNSs) is prepared by direct carbonization of polyaniline-co-polypyrrole (PACP) hollow spheres without template needing. Two different NiO nanostructures (nanosheets and nanowires) are prepared by forming a shell around the N-HCNSs via simple hydrothermal/calcination processes (NiO-NSs@N-HCNSs and NiO-NWs@N-HCNSs). The morphology and structure of the nanostructures are characterized using field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The prepared nanocomposites are used as catalysts for the electrocatalytic oxidation of hydrazine. The electrocatalytic activities of different electrodes including GCE, N-HCNSs/GCE, NiO-NPs/GCE, NiO-NSs@N-HCNSs/GCE and NiO-NWs@N-HCNSs/GCE for hydrazine oxidation are compared using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy (EIS) techniques. The obtained results revealed significantly higher electroactive surface area (ECSA), higher catalytic activity, lower over-potential and better stability of NiO-NWs@N-HCNSs/GCE toward the hydrazine electro-oxidation. This observation can be related to the different parameters such as the unique nanowires structure with free pores and the enlarged specific surface area, high conductivity of N-HCNSs, and the synergistic effect between NiO and N-HCNSs. © 2020 Elsevier B.V
  6. Keywords:
  7. Direct hydrazine fuel cell ; Electrocatalytic oxidation ; Hollow carbon nanospheres ; Hydrazine ; Nanostructured composites ; Carbon ; Carbonization ; Catalyst activity ; Catalytic oxidation ; Chronoamperometry ; Cyclic voltammetry ; Doping (additives) ; Electrocatalysis ; Electrochemical impedance spectroscopy ; Electrooxidation ; Enamels ; Field emission microscopes ; Fourier transform infrared spectroscopy ; Morphology ; Nanosheets ; Nanospheres ; Nanowires ; Nickel oxide ; Oxidation ; Polyaniline ; Polypyrroles ; Scanning electron microscopy ; Transition metal oxides ; Transition metals ; Transmission electron microscopy ; Electro-catalytic oxidation ; Electroactive surface areas ; Electrocatalytic activity ; Field emission scanning electron microscopy ; Fourier transform infra red (FTIR) spectroscopy ; Morphology and structures ; Non-precious catalysts ; Nanocatalysts
  8. Source: Journal of Electroanalytical Chemistry ; Volume 873 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1572665720306640