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Metals 2018, 8(2), 135; https://doi.org/10.3390/met8020135

Chemical Synthesis and Characterization of Pd/SiO2: The Effect of Chemical Reagent

The Smart Materials Research Center, Southern Federal University, 178/24 Sladkova, Rostov-on-Don 344090, Russia
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Received: 28 December 2017 / Revised: 7 February 2018 / Accepted: 12 February 2018 / Published: 16 February 2018
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Abstract

The size and shape distribution of metal nanoparticles (NPs) are important parameters that need to be tuned in order to achieve desired properties of materials for practical applications. In the current work, we present the synthesis of palladium NPs supported on silica by three different methods, applying reduction by sodium borohydride, hydrazine vapors, and polyethylene glycol (PEG). The synthesized materials were characterized by X-ray diffraction, X-ray fluorescence, transmission electron microscopy, surface area and porosity measurements, and thermogravimetric analysis. Similar nanoparticle sizes with narrow size distribution centered at 8 nm were obtained after reduction by sodium borohydride and hydrazine vapors, whereas the smallest particle size of about 4.8 nm was obtained after reduction by PEG. The effect of modification of the initial palladium chloride compound by ammonium hydroxide was found to lead to the formation of larger particles with average size of 15 nm and broader size distribution. In addition, the process of the reduction of palladium by PEG at different reduction stages was monitored by UV-Vis spectroscopy. CO-stripping voltammetry showed that reduction in hydrazine and in PEG allowed the preparation of Pd NPs with high electrochemically-active surface area. Such NPs are promising materials for electrocatalysis.
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Keywords: palladium nanoparticles; hydrazine; wet-synthesis; solvothermal polyol synthesis palladium nanoparticles; hydrazine; wet-synthesis; solvothermal polyol synthesis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bugaev, A.L.; Polyakov, V.A.; Tereshchenko, A.A.; Isaeva, A.N.; Skorynina, A.A.; Kamyshova, E.G.; Budnyk, A.P.; Lastovina, T.A.; Soldatov, A.V. Chemical Synthesis and Characterization of Pd/SiO2: The Effect of Chemical Reagent. Metals 2018, 8, 135.

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