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Fabrication of Co@SiO2@C/Ni submicrorattles as highly efficient catalysts for 4-nitrophenol reduction

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Abstract

In this paper, an extended Stöber method has been developed to fabricate a Ni2+-polydopamine (PDA) complex coated on Co3[Co(CN)6]2@SiO2 composites. After one-step carbonization involving the heat treatment of a Prussian blue analogue (PBA) of Co3[Co(CN)6]2 cores and the PDA-Ni2+ shell under a nitrogen atmosphere, homogeneous Co@SiO2@C/Ni submicrorattles were synthesized. Notably, the silica interlayer played a vital role in the formation of such Co@SiO2@C/Ni submicrorattle structures. Without the protection of SiO2, Co–Ni@C composites were obtained instead and aggregated seriously due to sintering at high temperature. While with the silica layer as the spacer, the obtained Co@SiO2@C/Ni composites were not only well dispersed in the solution, but could also be adjusted in terms of the size and density of Ni nanoparticles (NPs) on the surface. Moreover, the size of core Co and surficial Ni NPs can be facilely modulated via changing the calcination temperature, which can effectively control the catalytic performance of the as-prepared nanocomposites. The as-prepared Co@SiO2@C/Ni submicrorattles were employed as the reaction catalyst for the reduction of 4-nitrophenol (4-NP), and exhibit both superior catalytic activity and cycling stability to Co@SiO2 and Co–Ni@C composites.

Graphical abstract: Fabrication of Co@SiO2@C/Ni submicrorattles as highly efficient catalysts for 4-nitrophenol reduction

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Publication details

The article was received on 08 Jun 2017, accepted on 21 Jul 2017 and first published on 21 Jul 2017


Article type: Paper
DOI: 10.1039/C7DT02095C
Citation: Dalton Trans., 2017, Advance Article
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    Fabrication of Co@SiO2@C/Ni submicrorattles as highly efficient catalysts for 4-nitrophenol reduction

    X. Guo, M. Zhang, J. Zheng, J. Xu, T. Hayat, N. S. Alharbi, B. Xi and S. Xiong, Dalton Trans., 2017, Advance Article , DOI: 10.1039/C7DT02095C

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