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. 2023 Jan 10;16(2):659.
doi: 10.3390/ma16020659.

Synthesis and Catalytic Study of NiAg Bimetallic Core-Shell Nanoparticles

Konrad Wojtaszek  1 , Filip Cebula  1 , Bogdan Rutkowski  2 , Magdalena Wytrwal  3 , Edit Csapó  4 , Marek Wojnicki  1
Affiliations

Synthesis and Catalytic Study of NiAg Bimetallic Core-Shell Nanoparticles

Konrad Wojtaszek et al. Materials (Basel). .

Abstract

This publication presents the synthesis of core-shell nanoparticles, where the core was Ni, and the shell was a Ag-Ni nano alloy. The synthesis was based on the reduction of Ni and Ag ions with sodium borohydride in the presence of trisodium citrate as a stabilizer. In order to determine the phase composition of the obtained nanoparticles, an XRD study was performed, and in order to identify the oxidation states of the nanoparticle components, an XPS spectroscopic study was performed. The composition and shape of the particles were determined using the HR-TEM EDS test. The obtained nanoparticles had a size of 11 nm. The research on catalytic properties was carried out in the model methylene blue reduction system. The investigation of the catalytic activity of colloids was carried out with the use of UV-Vis spectrophotometry. The Ag-Ni alloy was about ten times more active than were pure silver nanoparticles of a similar size.

Keywords: bimetallic nanoparticles; catalytic properties; core–shell nanoparticles; kinetic studies; methylene blue reduction.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
UV–VIS spectra of obtained AgNPs and Ag@NiNPs.
Figure 2
Figure 2
XRD patterns of (A) AgNPs, (B) NiNPs, and (C) Ag@NiNPs.
Figure 3
Figure 3
Size distribution histograms of (A) AgNPs and (B) Ag@NiNPs.
Figure 4
Figure 4
Distribution of elements in AgNiNPs, (A) HR-SEM image, (B) Ni distribution, (C) Ag distribution, and (D) Ni and Ag distribution.
Figure 5
Figure 5
Diagram of the formation of the outer layer in the core–shell system.
Figure 6
Figure 6
HR-TEM image and analysis. (A) fold symmetry of AgNiNPs, (B) FFT analysis of selected area 1, (C) line profile analysis of selected direction, and (D) FFT analysis of selected area 2.
Figure 7
Figure 7
Size distribution based on HR-TEM pictures in which the number of analyzed particles is 200.
Figure 8
Figure 8
XPS analysis of (A) AgNPs, (B) NiNPs, (C) Ag electronic state in Ag@NiNPs, and (D) Ni electronic state in Ag@NiNPs.
Figure 9
Figure 9
UV–Vis spectra for the reduction of methylene blue by NaBH4 with (A) no catalyst, (B) AgNPs, and (C) AgNiNPs.
Figure 10
Figure 10
Kinetic curves of the methylene blue reduction process in 40 °C for system (A) NaBH4, (B) AgNPs, and (C) AgNiNPs.
Figure 11
Figure 11
Determination of activation energy using the Arrhenius dependence for (A) AgNPs and (B) AgNiNPs.
See this image and copyright information in PMC

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