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Preparation of Graphene-Co/Ni/Fe3O4 Nanocomposites and Their Electrocatalytic Activity for Reduction of p-Nitrophenol

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Graphene-based nanocomposites of graphene-Co, graphene-Ni, and graphene-Fe3O4 were synthesized via improved chemical-carbothermal reduction using graphite and nitrates as starting materials. The Co, Ni, and Fe3O4 nanoparticles are uniformly loaded on the surfaces of graphene nanosheets without serious folds and conglomeration. The average dimensions of the Co, Ni, and Fe3O4 nanoparticles attached to graphene are approximately 50, 60, and 5 nm, respectively. Subsequently, three novel types of graphene-Co/Ni/Fe3O4 nanocomposite-modified glassy carbon electrodes (GCEs) were fabricated, and their electrocatalytic activity for reduction of p-nitrophenol was investigated by cyclic voltammetry in phosphate buffer solution. Results show that the current values increase as the scanning rate is increased from 70 mV·s−1 to 100 mV·s−1 and that the electrochemical reactions on the surface of the graphene-Co/Ni/Fe3O4-modified GCEs are diffusion controlled. Compared with the bare GCE, the graphene-Co/Ni/Fe3O4 nanocomposite-modified GCEs display considerably higher reduction peak current, which proves that the graphene-Co/Ni/Fe3O4 nanocomposites possess favorable electrocatalytic ability for reduction of p-nitrophenol.
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Keywords: Electrocatalytic Activity; Graphene-Based Nanocomposite; Microstructure; p-Nitrophenol

Document Type: Research Article

Affiliations: 1: College of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan 056038, China 2: College of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, China

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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