Morphology-controlled synthesis of Ni-B nanoparticles by addition of hydrogen peroxide

TEM images of the samples are shown in Fig. 1. It is clear from images that the size of Ni-B nanoparticles decreased from about 120nm spheres (a), to 80nm pompom-like (b), to a 50nm sea urchin-like shape (c), and then increased to a 70nm flower-like shape (d). Ni-B nanoparticles morphology could be...

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Bibliographic Details
Published in:Materials letters 2017-08, Vol.200, p.90-93
Main Authors: Guo, Jie, Hou, Yongjiang, Li, Bo, Duan, Erhong
Format: Article
Language:English
Subjects:
Catalysts
Chemical reduction
Electrocatalysis
Electrocatalytic oxidation
Ethanol
Ethylenediamine
H2O2
Hydrogen peroxide
Materials science
Morphology
Morphology-controlled synthesis
Nanoparticles
Ni-B nanoparticles
Nickel
Oxidation
Studies
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Summary:TEM images of the samples are shown in Fig. 1. It is clear from images that the size of Ni-B nanoparticles decreased from about 120nm spheres (a), to 80nm pompom-like (b), to a 50nm sea urchin-like shape (c), and then increased to a 70nm flower-like shape (d). Ni-B nanoparticles morphology could be controlled by the addition of different amounts of hydrogen peroxide. [Display omitted] •Ni-B nanoparticles with various morphologies are synthesized by addition of hydrogen peroxide.•Add appropriate H2O2 can increase the BET areas and uniform active centers of Ni-B nanoparticles.•The sea urchin-like Ni-B catalyst displays the best ethanol electrocatalytic oxidation activity. In this paper, H2O2 was used to control the morphology of Ni-B nanoparticles prepared by chemical reduction of nickel ethylenediamine complex. With increasing H2O2 concentration, Ni-B nanoparticle morphology progressed from pompon-like to sea urchin-like and finally to a flower-like shape. The controlled morphology was the result of dynamic equilibrium between the reduction of nickel ions by KBH4 and oxidation dissolution of Ni-B nanoparticles due to etching by H2O2. Additionally, the Ni-B catalyst nanoparticles had large BET areas and more uniform Ni active centers on the surface. However, excess H2O2 could disrupt the dynamic equilibrium, allowing the production of various structures of Ni-B nanoparticles. The catalyst composition with a molar ratio of 1:1 Ni ion to H2O2 showed the best activity toward electrocatalytic oxidation of ethanol.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.04.111