“…According to the TEM analysis results, it is clear that the synthesized nanoparticles are spherical, isotropic in structure (Figure 1). TEM images showed that the particle size of Rc-Ag NPs was 13–21 nm (with the help of the elimination of outliers) consistent with the literature [29, 30]. Figure 1(a) TEM patterns and (b) particle size histogram of Rc-Ag NPs.…”
A B S T R A C TIn biomedical applications, silver nanoparticles (Ag NPs) are of great interest due to their cost-effective and environmentally friendly properties. Green synthesis of nanoparticles for biological research is a preferred choice since it does not require additional reducing agent. For this purpose, in this study, we aimed to synthesize the biogenic silver nanoparticles with the help of Rosa canina plant (Rc-Ag NPs) and then they have been tried for their antioxidant and antibacterial properties. UV-Vis spectrophotometer, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses were performed for characterization of Rc-Ag NPs. Antioxidant properties of silver nanoparticles synthesized with Rosa canina plant were investigated against 2,2 0 -diphenyl-1-picrylhydrazyl radical (DPPH). DNA dissociation activity of synthesized Rc-Ag NPs was studied, and DNA dissociation activity was shown. The antimicrobial activity of Rc-Ag NPs was also tested using micro-dilution. According to the results, Rc-Ag NPs synthesized were found to be highly effective for anti-oxidant, antibacterial, antifungal, and DNA cleavage activities.
“…According to the TEM analysis results, it is clear that the synthesized nanoparticles are spherical, isotropic in structure (Figure 1). TEM images showed that the particle size of Rc-Ag NPs was 13–21 nm (with the help of the elimination of outliers) consistent with the literature [29, 30]. Figure 1(a) TEM patterns and (b) particle size histogram of Rc-Ag NPs.…”
A B S T R A C TIn biomedical applications, silver nanoparticles (Ag NPs) are of great interest due to their cost-effective and environmentally friendly properties. Green synthesis of nanoparticles for biological research is a preferred choice since it does not require additional reducing agent. For this purpose, in this study, we aimed to synthesize the biogenic silver nanoparticles with the help of Rosa canina plant (Rc-Ag NPs) and then they have been tried for their antioxidant and antibacterial properties. UV-Vis spectrophotometer, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses were performed for characterization of Rc-Ag NPs. Antioxidant properties of silver nanoparticles synthesized with Rosa canina plant were investigated against 2,2 0 -diphenyl-1-picrylhydrazyl radical (DPPH). DNA dissociation activity of synthesized Rc-Ag NPs was studied, and DNA dissociation activity was shown. The antimicrobial activity of Rc-Ag NPs was also tested using micro-dilution. According to the results, Rc-Ag NPs synthesized were found to be highly effective for anti-oxidant, antibacterial, antifungal, and DNA cleavage activities.
“…The study showed that PtCu/C catalyst exhibits higher activity in the reactions of electrooxidation of organic substances in comparison with Pt/C at high potentials, while the Pt/(SnO 2 /C) catalyst is the most active among the studied samples and is tolerant to the resulting intermediates under conditions where electrooxidation occurs at a potential of 0.60 V. The reasons for the increased activity of Pt/(SnO 2 /C) and PtCu/C catalysts compared to Pt/C in MOR were previously discussed in [32,33,44] and [33][34][35], respectively. The presence of Pt and SnO 2 nanoparticles attached to the surface of a carbon support can facilitate the implementation of a bifunctional catalysis mechanism by facilitating the adsorption of hydroxyl groups on the surface of tin dioxide nanoparticles and their participation in the conversion of CO molecules (an intermediate product of organic substances oxidation) on the surface of neighboring platinum nanoparticles.…”
Electrooxidation of methanol, ethanol, and formic acid was studied on three platinum-containing electrocatalysts: PtCu/C, Pt/(SnO2/C), and Pt/C, Pt content being about 20 wt%. In all reactions, the integral specific activity of the catalysts, estimated from the results of cyclic voltammetry, grows in the Pt/C < Pt/(SnO2/C) < PtCu/C row. The influence of the reagent nature subjected to electrooxidation is manifested both in the difference of the absolute rate values of the corresponding reactions, decreasing in the order CH3OH > HCOOH > C2H5OH, and in the different ratio of these rates on different catalysts and at different potentials. Pt/(SnO2/C) catalyst containing SnO2 nanoparticles is the most active among the studied catalysts in methanol and formic acid electrooxidation reactions under potentiostatic conditions at the E = 0.60 V. Moreover, in formic acid electrooxidation reaction it is significantly superior to even the PtRu/C commercial catalyst. The reasons for the positive influence of Cu atoms and SnO2 nanoparticles on the catalytic activity of platinum are presumably associated with different effects: Interaction of the d-orbitals of copper and platinum atoms in bimetallic nanoparticles and implementation of the bifunctional catalysis mechanism on the adjacent platinum and tin dioxide nanoparticles.
“…As evident, the oxidation currents quickly collapsed at an initial stage of CA curves and continued quietly till the end of the scanning. This decline is owing to the poisoning of electrocatalysts by PdO 2 and Pd (OH) 4 and adsorption of CO, hydrocarbons, and oxygenates 43 . The amount of exchange charge, the current density in the beginning and end of time CA are recorded in Table 1.…”
The spongy nickel oxide (SNO) was synthesized the solution combustion method. The SNO was selected as a promoter to boost the catalytic activity of nanoraspberry‐like palladium (NRPd) toward electrooxidation of five light fuels (LFs): methanol, ethanol, formaldehyde, formic acid, and ethylene glycol. The X‐ray powder diffraction, Fourier‐transform infrared spectroscopy (FT‐IR), scanning electron microscopy, and field emission scanning electron microscope techniques were used for the materials characterization. In comparison with nonpromoted Pd, the NRPd‐SNO electrocatalyst shown an excellent efficiency in parameters like the electrochemical active surface area and anti‐CO poisoning behavior. The turnover data and the parameters, including reaction order, activation energy, and the coefficients of electron transfer and diffusion, were evaluated for the each process of LFs electrooxidation. The outcome for NRPd‐SNO activity toward LFs electrooxidation was compared to some reported electrodes. The SNO increases the removal of intermediates created in the oxidation of LFs that can poison the surface of palladium catalyst. This is due to the presence of the lattice oxygens in SNO structure and Ni switching between its high and low valances. The compatibility of the adsorption process of LFs on the surface of the NRPd‐SNO catalyst with different isotherms was determined by studying the Tafel polarization and calculating the surface coverage.
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