The intense demand for alternative energy has led to efforts to find highly efficient and stable electrocatalysts for the methanol oxidation reaction. For this purpose, herein, graphene oxide-based platinum-cobalt nanoparticles (Pt100−xCox@GO NPs) were synthesized in different ratios and the synthesized nanoparticles were used directly as an efficient electrocatalyst for methanol oxidation reaction (MOR). The characterizations for the determination of particle size and surface composition of nanoparticles were performed by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The structure of the catalysts was detected as face-centered cubic and the dispersion of them on graphene oxide was homogenous (distributed narrowly (4.01 ± 0.51 nm)). Cyclic voltammetry (CV) and chronoamperometry (CA) was utilized for testing electrocatalytic activities of all prepared NPs for the methanol oxidation reaction. It was detected that the newly produced NPs were more active and stable than commercially existing Pt(0)/Co nanomaterial in methanol electro-oxidation in acidic media.
A novel catalyst which carbon hybrid supported platinum nanoparticles
were synthesized by our group for the oxidation of benzyl alcohol derivatives. In
this study, this catalyst was utilized for the oxidation of benzyl alcohol
derivatives to benzaldehyde compounds in aqueous toluene at 80 °C. The benzaldehyde
derivatives were synthesized in high yields and mild conditions in the presence of
the catalyst by the developed method. Additionally, the prepared nanoparticles have
been characterized by Transmission Electron Microscopy (TEM), the high-resolution
electron micrograph (HR-TEM), X-ray Photoelectron Spectroscopy (XPS), and X-ray
Diffraction (XRD). The mean particle size of the nanoparticles determined by the XRD
technique was found to be 2.83 nm in parallel with TEM analysis. TEM analysis also
indicated that the Pt nanoparticles were evenly dispersed on the support material.
Finally, the Pt@CHs catalyst was shown also stable and reusable for the oxidation
reaction, providing ≤95% conversion after its 3rd consecutive use in the oxidation
reaction of various compounds.
Herein,
we have described uniformly dispersed palladium–nickel
nanoparticles furnished on graphene oxide (GO-supported PdNi nanoparticles)
as a powerful heterogeneous nanocatalyst for the promotion of Knoevenagel
reaction between malononitrile and aromatic aldehydes under mild reaction
conditions. The successful characterization of PdNi nanoparticles
on the GO surface was shown by X-ray diffraction, X-ray photoelectron
spectroscopy, high-resolution transmission electron microscopy (HR-TEM),
and TEM. GO-supported PdNi nanoparticles, which are used as highly
efficient, stable, and durable catalysts, were used for the first
time for the Knoevenagel condensation reaction. The data obtained
here showed that the GO-supported PdNi nanocatalyst had a unique catalytic
activity and demonstrated that it could be reused five times without
a significant decrease in the catalytic performance. The use of this
nanocatalyst results in a very short reaction time under mild reaction
conditions, high recyclability, excellent catalytic activity, and
a straightforward work-up procedure for Knoevenagel condensation of
malononitrile and aromatic aldehydes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.