Synthesis of Rh nanoparticles in alcohols: magnetic and electrocatalytic properties

Ramírez-Meneses, E.; Philippot, Karine; Domínguez‐Crespo, M.A.; Ibrahim, Mahmoud; Betancourt, I.; Torres‐Huerta, A.M.; Ezeta-Mejía, A.

doi:10.1007/s10853-018-2221-8

Cited by 9 publications

(11 citation statements)

References 60 publications

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“…The manipulation of the reaction kinetics by variation of synthesis parameters such as temperature and concentration leads to nanoparticles of different size and shape [ 61 – 62 ]. A hydrogen-based reduction in alcohols like methanol, heptanol, and propanol leads to sponge-like rhodium nanostructures [ 63 ]. Palladium nanoparticles can be synthesized either by the polyol process or by sono-, electro- and wet-chemical methods [ 64 ].…”

Section: Resultsmentioning

confidence: 99%

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

Rostek¹,

Breisch²,

Pappert³

et al. 2018

Beilstein J. Nanotechnol.

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For a comparative cytotoxicity study, nanoparticles of the noble metals Rh, Pd, Ag, Pt, and Au (spherical, average diameter 4 to 8 nm) were prepared by reduction in water and colloidally stabilized with poly(N-vinyl pyrrolidone) (PVP). Thus, their shape, size, and surface functionalization were all the same. Size and morphology of the nanoparticles were determined by dynamic light scattering (DLS), analytical disc centrifugation (differential centrifugal sedimentation, DCS), and high-resolution transmission electron microscopy (HRTEM). Cell-biological experiments were performed to determine the effect of particle exposure on the viability of human mesenchymal stem cells (hMSCs). Except for silver, no adverse effect of any of the metal nanoparticles was observed for concentrations up to 50 ppm (50 mg L−1) incubated for 24 h, indicating that noble metal nanoparticles (rhodium, palladium, platinum, gold) that do not release ions are not cytotoxic under these conditions.

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Section: Resultsmentioning

confidence: 99%

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

Rostek¹,

Breisch²,

Pappert³

et al. 2018

Beilstein J. Nanotechnol.

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show abstract

“…Grass et al [19] used poly (vinylpyrrolidone) (PVP) as capping agent to stabilize monodisperse Rh through one-step polyol method at 140 °C under vacuum. Zettsu et al [20] prepared branched Rh multipods in large quantities, and the reaction was continued up to 120 h. Ramírez-Meneses et al [21] reported the synthesis of Rh nanoparticles through an organometallic approach starting from the tris(allyl) rhodium complex, Rh(η 3 -C 3 H 5 ) 3 , as precursor and using an alcohol as both a solvent and a stabilizer, under mild reaction conditions (room temperature; 3 bar H 2 ). Park and co-workers [22] mentioned another approach by decomposing organometallic precursor to prepare spherical nanoparticles at 170 °C.…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Study on the influence of the thickness of nanostructured rhodium films toward electrooxidation of adsorbed carbon monoxide

2020

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Carbon-supported rhodium thin films with various thicknesses are grown by varying the number of laser pulses, N lp (from 5000 to 50,000) under 2 Torr of He background atmosphere using the pulsed laser deposition method. The thin films are characterized for their morphological features and structural properties. It is observed that smooth dense 2D nanosheets of Rh are obtained with 5000 N lp , whereas higher N lp yields to highly porous Rh films. X-ray photoelectron spectroscopy reveals that both metallic Rh and Rh 3+ are present at the surface of the Rh films. Nevertheless, the amount of metallic Rh increased as the N lp increased. The influence of the thickness of the Rh films on the tolerance to CO, a poison that strongly adsorbs on the surface of catalysts in fuel cells reactions, was investigated through anodic stripping voltammetry. It is found that Rh film deposited with 50,000 N lp exhibits the highest electroactive surface area (27.90 cm 2 vs. 1.20 cm 2 of Pt), the lowest onset potential of CO electrooxidation (0.47 V vs. 0.60 V Pt), and a net charge corresponding to electrooxidation of the CO adlayer of 424 μC cm −2 (vs. 358 μC cm −2 of Pt). Such high tolerance to CO poisoning is explained on the basis of the elevated porosity and roughness of the Rh surface. Indeed, a roughness factor of 90.5 for Rh against about 3.8 for Pt grows under analogous deposition conditions of pressure and number of laser pulses.

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“…Herein, we report the synthesis of homogeneous hcp-Co nanocrystals (NCs) at RT in just 6 min, implying a disproportionation pathway in which no reductive agents are necessary. Moreover, the capping of generated NPs is performed by biosourced fatty alcohol ligands, which is unusual for Co NPs but previously observed for other transition-metal NPs . In addition, through a recycling process, most of the waste can be reused for synthesis of the starting Co complex.…”

Section: Introductionmentioning

confidence: 99%

Simpler and Cleaner Synthesis of Variously Capped Cobalt Nanocrystals Applied in the Semihydrogenation of Alkynes

et al. 2020

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Unlike the classical organometallic approach, we report here a synthetic pathway requiring no reducing sources or heating to produce homogenous hexagonal close packed cobalt nanocrystals (NCs). Involving a disproportionation process, this simple and fast (6 min) synthesis is performed at room temperature in presence of eco-friendly fatty alcohols to passivate Co NCs. Through a recycling step, the yield of Co NCs is improved and the waste generation is limited making this synthetic route cleaner. After an easy exchange of the capping ligands, we applied them as unsupported catalyst in the stereo-selective semi-hydrogenation of alkynes. ASSOCIATED CONTENT Supporting InformationExperimental procedures, microscopic analyses (TEM, SEM-EDX), size histograms, characterization of products resulting from alkynes catalysis and magnetic measurement information. The Supporting Information is available free of charge on the ACS Publications website.

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Synthesis of Rh nanoparticles in alcohols: magnetic and electrocatalytic properties

Cited by 9 publications

References 60 publications

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

Study on the influence of the thickness of nanostructured rhodium films toward electrooxidation of adsorbed carbon monoxide

Simpler and Cleaner Synthesis of Variously Capped Cobalt Nanocrystals Applied in the Semihydrogenation of Alkynes

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