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Three-dimensional hybrid of iron–titanium mixed oxide/nitrogen-doped graphene on Ni foam as a superior electrocatalyst for oxygen evolution reaction

Mousavi, D. S ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2019.12.080
  3. Publisher: Academic Press Inc , 2020
  4. Abstract:
  5. Growing demands for clean and renewable energy technologies have sparked broad research on the development of highly efficient and stable non-noble metal electrocatalysts for oxygen evolution reaction (OER). In this regard, in the present work a three-dimensional Fe2TiO5/nitrogen-doped graphene (denoted as 3D FTO/NG) hybrid electrocatalyst was synthesized via a facile in-situ process using a hydrothermal method. Structural characterization of the prepared nanocomposite is performed by various techniques e.g. field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM) analysis, Fourier transform infrared spectra (FT-IR), X-ray photoelectron spectroscopy spectra (XPS), X-ray diffraction (XRD) and Raman spectroscopic methods. A novel binder-free electrode for OER activity has been prepared by coating a 3D FTO/NG onto nickel foam (NF). In particular, the 3D FTO/NG nanocomposite, which is synthesized with in-situ hydrothermal process, exhibited a remarkable OER performance in alkaline media. The prepared electrocatalyst showed a small overpotential of 0.36 V with a Tafel slope of 0.07 V dec−1 at 100 A m−2 with a long-term stability for OER reaction in 1 M KOH. The outstanding OER performance and durability of 3D FTO/NG can be attributed to the synergistic effects originating from NG and FTO in the prepared electrocatalyst, which helps to enhance the conductivity of the nanocomposite. The presence of conductive NG in the prepared 3D nanocomposite can not only improve the mechanical stability, but also facilitate its electron transport. Also, N atoms and FTO provide abundant electrocatalytic active sites, which accelerate evolution of gas bubbles. This work provides a promising approach for synthesis of inexpensive and efficient OER electrocatalysts. © 2019 Elsevier Inc
  6. Keywords:
  7. Electrocatalyst ; Fe2TiO5 ; Hydrothermal method ; In situ process ; Nitrogen-doped graphene ; Oxygen evolution reaction ; Atomic force microscopy ; Doping (additives) ; Electron transport properties ; Enamels ; Field emission microscopes ; Graphene ; In situ processing ; Iron ; Mechanical stability ; Nanocomposites ; Nickel coatings ; Oxygen ; Photoelectron spectroscopy ; Potassium hydroxide ; Precious metals ; Renewable energy resources ; Scanning electron microscopy ; Slope stability ; Spectroscopic analysis ; Titanium oxides ; Fourier transform infrared spectra ; Hydrothermal methods ; Nitrogen doped graphene ; Renewable energy technologies ; X-ray photoelectron spectroscopy spectra ; Electrocatalysts ; Nanocomposite ; Nickel ; Nitrogen ; Titanium dioxide ; Catalyst ; Chemical reaction ; Chemical structure ; Choronoamperometry ; Conductance ; Electrochemical analysis ; Electron transport ; Field emission scanning electron microscopy ; Foam ; Fourier transform infrared spectroscopy ; Impedance spectroscopy ; Linear sweep voltammetry ; Measurement ; Measurement accuracy ; Nickel foam ; Oxygen evolution ; Potentiometry ; Priority journal ; Raman spectrometry ; Three dimensional imaging ; X ray diffraction ; X ray photoemission spectroscopy
  8. Source: Journal of Colloid and Interface Science ; Volume 563 , 15 March , 2020 , Pages 241-251
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021979719315474