Monodisperse thiourea functionalized graphene oxide-based PtRu nanocatalysts for alcohol oxidation

Abstract

Addressed herein, thiourea functionalized graphene oxide-based PtRu nanocatalysts (PtRu@T/GO) has been synthesized and characterized by several techniques and performed for methanol oxidation reactions as novel catalysts. In this study, graphene oxide (GO) was functionalized with thiourea (T/GO) in order to obtain monothiol functionalized graphene and increase the stability and activity of the nanocatalysts. Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), TEM (transmission electron microscopy) and high-resolution transmission electron microscopy (HR-TEM) were used for characterization of the prepared nanocatalysts. The results obtained from these techniques showed that the prepared nanocatalysts were in a highly crystalline form, well dispersed on T/GO, very small in size and colloidally stable. The average size of the synthesized nanocatalysts determined by TEM analysis was found to be 3.86 ± 0.59 nm. With HR-TEM analysis, the atomic lattice fringes of the nanocatalysts were calculated to be 0.23 nm. After the full characterization of the prepared nanocatalysts, they were tried for the methanol oxidation reaction (MOR) and it was observed that 97.3% of the initial performance was maintained even after 1000 cycles while exhibiting great catalytic activity and stability with the help of T/GO. Thus, the arranged nanocatalysts displayed great heterogeneous catalyst characteristics for the methanol oxidation response.

Intriguing physicochemical properties and impact of co-dopants on N-doped graphene oxide based ZnS nanowires for photocatalytic application

“…The autoclave was cooled to room temperature, the solution was filtered, it was washed several times in DI water, and it was dried at room temperature. Then, the final product was N-doped GO which was dried at 60 °C 17 – 19 .…”

Pt Nanoparticle-Decorated Se Rods for Electrochemical Detection of 17β-Estradiol and Methanol Oxidation

“…Noble metals (Au, Pt, Ag, Pd, Ru, and Rh) have attracted significant attention due to their advantageous catalytic, electronic, and optical properties, attributed to their electron confinement effect and higher surface-to-volume ratio. In addition, their high density of coordinated surface atoms may enhance their significant activity in the selective oxidation of alcohol. − Among all noble metals, platinum (Pt) reveals excellent catalytic behavior and proves to be a promising electrocatalyst for MOR applications. , In addition, commercially available Pt/C catalysts are often considered with respect to their catalytic stability and activity. Although Pt is considerably expensive and a rare natural resource, it has a remarkable impact on the commercialization of DMFC devices. , Due to the high price of Pt, the quantity used is reduced by introducing a heteroatom or by combining other metals with Pt. − Although carbon-supported catalysts are not suitable for industrial production, Pt-based chalcogenides are preferred to commercial MOR-oriented DMFC devices.…”

The Development of High-Performance Platinum-Ruthenium Catalysts for the Methanol Oxidation Reaction: Gram-Scale Synthesis, Composition, Morphology, and Functional Characteristics

“…The platinum-ruthenium catalyst is thought to be the most effective material for the electrooxidation of methanol [3,[7][8][9]. Many researchers [3,7] assume that the reaction of the methanol oxidation on the PtRu surface of NPs might proceed via the bifunctional mechanism, with chemisorption and dehydrogenation of the methanol molecule occurring on the Pt atom, while oxidation of the chemisorbed CO particles occurs with the participation of the OH-groups adsorbed mostly on the surface of ruthenium [3,10].…”

“…Many researchers [3,7] assume that the reaction of the methanol oxidation on the PtRu surface of NPs might proceed via the bifunctional mechanism, with chemisorption and dehydrogenation of the methanol molecule occurring on the Pt atom, while oxidation of the chemisorbed CO particles occurs with the participation of the OH-groups adsorbed mostly on the surface of ruthenium [3,10]. Gasteiger [11] and Abruna [12] point out that ruthenium is capable of decreasing the dissociation potential of water, thus resulting in the presence of more OH ads to accelerate the CO oxidation, as well as inhibiting the CO adsorption due to the change in the electronic structure of Pt (a ligand effect) [8,13].…”

“…The materials' structural-morphological parameters caused by the selected synthesis method of particles are known to affect the electrochemical characteristics of the electrocatalysts based on PtRu NPs [14,15]. There are several major factors affecting the PtRu/C catalysts' activity, such as the alloy composition [16][17][18][19], the distribution uniformity, the morphology [20], the shape and size of particles [8,21,22], which depend on the preparation technique, and the electronic state [23].…”