Saim Özkar

Middle East Technical University | METU · Department of Chemistry

A new palladium(0) nanocatalyst is developed to enhance the catalytic efficiency of precious metal catalysts in hydrogen generation from the hydrolytic dehydrogenation of ammonia borane. Magnetically separable Pd⁰/Co3O4 nanocatalyst can readily be obtained by the reduction of palladium(II) cations impregnated on cobalt(II, III) oxide at room temper...

Lactic acid is a high-value-added chemical with large production, which is used in many industries including the production of pyruvic and acrylic acids. Lactic acid is largely obtained from the oxidation of glycerol, which is a prevalent by-product of biodiesel production. However, the oxidation of glycerol to lactic acid requires harsh reaction c...

It reports how to increase the overall catalytic performance of precious platinum nanocatalysts in hydrolytic dehydrogenation of ammonia borane which requires enhancement of both catalytic activity and reusability of the nanocatalysts as well as the fraction of active sites over the total platinum atoms. The following approaches are reported for in...

The electrochemical conversion of carbon dioxide into low carbon fuels is a very convenient way of reducing the concentration of atmospheric CO2, which is the main cause of global warming. CO is known to be the most common and profitable product of CO2 reduction due to its low energy requirement and reaction simplicity. However, the viability of th...

This review reports a survey on the progress in developing highly efficient platinum nanocatalysts for the hydrolytic dehydrogenation of ammonia borane (AB). After a short prelude emphasizing the importance of increasing the atom efficiency of high cost, precious platinum nanoparticles (NPs) which are known to be one of the highest activity catalys...

It reviews the available reports on the preparation and use of magnetically separable transition metal nanoparticles (TMNs) as reusable catalysts for the hydrolytic dehydrogenation of ammonia borane (AB). After a short introduction, the review starts with the papers on the employment of intrinsically magnetic TMNs as catalysts for releasing H2 gas...

In this work, platinum(0) nanoparticles are deposited on the surface of magnetic cobalt ferrite forming magnetically separable Pt⁰/CoFe2O4 nanoparticles, which are efficient catalysts in H2 generation from the hydrolysis of ammonia borane. Catalytic activity of Pt⁰/CoFe2O4 nanoparticles decreases with the increasing platinum loading, parallel to th...

Herein, we report the use of tungsten(VI) oxide (WO3) as support for Rh⁰ nanoparticles. The resulting Rh⁰/WO3 nanoparticles are highly active and stable catalysts in H2 generation from the hydrolysis of ammonia borane (AB). We present the results of our investigation on the particle size distribution, catalytic activity and stability of Rh⁰/WO3 cat...

Herein, we report the development of a nickel-based catalyst obtained by reduction of Ni2+ ions on the surface of ceria nanopowder using aqueous solution of NaBH4. The catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). Nick...

Herein, we developed a precursor approach toward the design of a titanium nitride (TiN)/silicon nitride (Si3N4) nanocomposite with activated carbon monolith as a support matrix forming a highly micro-/mesoporous component to be used as a Pt support for the catalytic hydrolysis of sodium borohydride (NaBH4) as a model reaction. The experimental data...

Cobalt(II,III) oxide nanopowder is used as supporting materials for rhodium(0) nanoparticles forming Rh⁰/Co3O4 nanocatalyst, which can be prepared by impregnation and sodium borohydride reduction of Rh³⁺ ions on the surface of oxide support. Magnetically separable Rh⁰/Co3O4 nanoparticles are isolated from the reaction medium using an external magne...

The effects of microfiltration removal of filterable dust on nanoparticle formation kinetics and particle-size distribution, in a polyoxometalate polyanion (P2W15Nb3O629-)-stabilized Ir(0) n nanoparticle formation system, are analyzed by the newly developed method of Mechanism-Enabled Population Balance Modeling (ME-PBM). The [(Bu4N)5Na3(1,5-COD)Ir...

We report the synthesis of magnetically isolable ruthenium(0), rhodium(0), and palladium(0) nanoparticles, supported on carbon-coated magnetic iron particles, and their employment as catalysts in hydrolysis of ammonia borane. Carbon-coated iron (C–Fe) particles are obtained by co-processing of iron powders with methane in a radio frequency thermal...

Zinc borate was synthesized from the reaction of zinc oxide and boric acid in the absence or presence of seven different water soluble additives. Additive concentration and zinc oxide particle size were varied to investigate their effect on the growth kinetics of zinc borate particles. Zinc borate particles were characterized by X-ray diffraction (...

The concept of Mechanism-Enabled Population Balance Modeling (ME-PBM) is reported, illustrated by its application to a prototype Ir(0) n nanoparticle formation reaction. ME-PBM is defined herein as the use of now available, experimentally established, disproof-based, deliberately minimalistic mechanisms of particle formation as the required input f...

A look back at LaMer’s 1950 model of particle formation is undertaken (LaMer, V. K.; Dinegar, R. H. Theory, Production and Mechanism of Formation of Monodispersed Hydrosols. J. Am. Chem. Soc.1950, 72, 4847–4854), a highly cited paper that has more than 1953 citations as of March 2019. The nonmathematical, verbal version of LaMer’s model, namely, th...

Ceria supported ruthenium nanoparticles (Ru⁰/CeO2) are synthesized by impregnation of Ru³⁺ ions on CeO2 powders followed by sodium borohydride reduction of Ru³⁺/CeO2. Their characterization was achieved using analytical methods including TEM, XRD, BET, SEM, and XPS. All the results reveal the formation of ruthenium(0) nanoparticles in 1.8 ± 0.3 nm...

Magnetically separable catalysts attract considerable attention in catalysis due to their facile separation from the reaction medium. This propensity is crucial for efficient multiple use of precious noble metal nanoparticles in catalysis. In fact, the isolation of catalysts from the reaction medium by filtration and washing results usually in the...

A heterogeneous nanocatalyst containing polyoxomolybdate immobilized on the internal surface of amino‐functionalized SBA‐15 pores was prepared and fully characterized by several analytical techniques. The textural property of supported material was found to retain important mesoporous features, compatible with its potential use as heterogeneous cat...

Palladium(II) 2,4-pentanedionate, impregnated on alumina nanopowder, was reduced by dimethylamine borane (DMAB) forming Pd(0) nanoparticles (NPs) at room temperature. Pd(0) NPs could be isolated from solution and characterized by ATR-IR, UV–vis, XRD, SEM, TEM, XPS and BET. The results obtained from TEM images reveal the formation of palladium(0) na...

Ammonia borane (H 3 N·BH 3 , AB)is one of the promising hydrogen storage materials due to high hydrogen storage capacity (19.6% wt), high stability in solid state as well as in solution and nontoxicity. The methanolysis of AB is an alternative way of releasing H 2 due to many advantages over the hydrolysis such as having high stability against self...

Rh³⁺ ions are first impregnated on Group 4 metal oxides (TiO2, ZrO2, HfO2) in aqueous solution and, then reduced with aqueous solution of NaBH4 to form rhodium(0) nanoparticles (NPs) on the oxide surface. The analyses reveal that Rh(0) NPs are highly dispersed on the surface of TiO2, ZrO2, HfO2. Rh⁰/MO2 (M: Ti, Zr, Hf) NPs have high activity and re...

It is of considerable interest to prepare weakly ligated, labile ligand (WLLL) nanoparticles for applications in areas such as chemical catalysis. WLLL nanoparticles can be defined as nanoparticles with sufficient, albeit minimal, surface ligands of moderate binding strength to meta-stabilize nanoparticles, initial stabilizer ligands that can be re...

In this paper, CdS nanoparticles as a visible light active photocatalyst were coupled by NiFe2O4 and reduced graphene oxide (rGO) to form CdS–NiFe2O4/rGO nanocomposite by facile hydrothermal methods. The CdS–NiFe2O4/rGO nanocomposite shows enhanced photocatalytic activity for the degradation of methylene blue (MB) under visible light illumination....

Mesoporous MnCo2O4 with hierarchical structures were synthesized from a dual-metal zeolitic-imidazolate framework (ZIF) as precursor. The corresponding heterometallic ZIF was synthesized by mixing manganese(II) and cobalt(II) ions in the presence of 2-methylimidazole as linker. Calcination of the intermediate ZIF in air affords the nanosized mesopo...

Ruthenium(0) nanoparticles were successfully prepared on the surface of ceria (Ru0/CeO2) and used as catalysts on glassy carbon electrode (GCE) in oxygen evolution reaction (OER) from water electrolysis at room temperature. Ru0/CeO2 on GCE exhibits high catalytic activity for OER in alkaline solution. It provides a low onset potential of 1.57 V vs....

A new nonplanar and soluble, donor−acceptor−donor system (3) based on a perylene diimide chromophore (1) consisting on 5-amino-4-cyano-3-methylthiophene-2-carboxamide (2) as electron donating unit at imide position has been synthesized. The photophysical and electrochemical properties were systematically investigated in different solvents. All the...

Ruthenium(0) nanoparticles supported on bare or silica-coated magnetite are prepared by impregnation of ruthenium(III) ions followed by their reduction with aqueous solution of sodium borohydride on the surface of support. These magnetically isolable catalysts are used in hydrogen generation from the hydrolysis of ammonia borane at room temperature...

Metal ferrites nanocrystallites, MFe2O4 (M = Mn, Co, Ni, Zn) were prepared by coprecipitation method and characterized by a combination of physico‐chemical and spectroscopic techniques. MFe2O4 nanoparticles having particle size in the range 10–35 nm were tested as catalysts in the oxidation of o‐phenylenediamine (OPD) to 2,3–diaminophenazine (DAP)...

Herein we report for the first time the preparation and catalytic use of the ceria supported manganese(0) nanoparticles in hydrogen generation from the hydrolysis of sodium borohydride. They are in situ formed from the reduction of manganese(II) ions on the surface of ceria nanopowders during the catalytic hydrolysis of sodium borohydride in aqueou...

Designing a cost-effective catalyst with high activity and stability for hydrogen evolution reaction (2H+ + 2e- → H2) is a big challenge due to increasing demand for energy. Herein, we report the electrocatalytic activity of glassy carbon electrodes with group 4 metal oxides (TiO2, ZrO2, HfO2) supported ruthenium(0) nanoparticles in hydrogen evolut...

This work reports the preparation and catalytic use of nanoceria supported rhodium(0) nanoparticles, Rh(0)/nanoCeO2, as catalyst for hydrogen generation from the methanolysis of ammonia borane. Rh(0)/nanoCeO2 was in situ formed from the reduction of rhodium(II) octanoate on the surface of nanoceria during the catalytic methanolysis of ammonia boran...

Ammonia borane is an appropriate solid hydrogen storage material because of its high hydrogen content of 19.6% wt., high stability under ambient conditions, nontoxicity, and high solubility in common solvents. Hydrolysis of ammonia borane appears to be the most efficient way of releasing hydrogen stored in it. Since ammonia borane is relatively sta...

Tremendous efforts have been devoted on the development of efficient and safe hydrogen storage materials. Among them amine boranes, such as ammonia borane, dimethylamine borane, and hydrazine borane, have attracted much attention as promising chemical hydrogen storage materials. Recently, we have published many reports on the development of transit...

A quantitative kinetics and mechanistic re-analysis is performed of an important 2016 paper that described the formation of Agn nanoparticles from the polyol reduction of silver nitrate in the presence of poly(N-vinylpyrrolidone) under microwave heating. Elegantly and expertly obtained, in operando synchrotron high-energy X-ray diffraction (HEXRD)...

Rhodium(0) nanoparticles were in situ formed from the reduction of rhodium(II) octanoate and supported on the surface of nanoalumina yielding Rh(0)/nanoAl2O3 which is highly active catalyst in hydrogen generation from the methanolysis of ammonia borane at room temperature. The kinetics of nanoparticle formation can be followed just by monitoring th...

An important but virtually ignored 1978 paper by Reeves and co-workers, which examined a dye–OAc hydrolysis and then agglomeration system, is reanalyzed in light of current state of knowledge of nucleation and growth/agglomeration phenomena. The Finke–Watzky two-step mechanism is used to account quantitatively for the kinetics data, in turn providi...

Rhodium(0) nanoparticles, in situ formed from the reduction of rhodium(II) octanoate in toluene solution, are active catalyst in dehydrogenation of dimethylamine borane, however not very stable. When the same nanoparticle formation reaction is performed in the presence of nanotitania it yields the supported rhodium(0) nanoparticles (Rh(0)/nanoTiO2)...

Palladium(0) nanoparticles supported on cobalt ferrite (Pd⁰/CoFe2O4) are found to be highly active catalyst, providing an unprecedented catalytic activity with a turnover frequency of 290 min⁻¹ in hydrogen generation from the hydrolysis of ammonia borane at room temperature. However, the initial catalytic activity of Pd⁰/CoFe2O4 catalyst is not pre...

The question is addressed if dust is kinetically important in the nucleation and growth of Ir(0)n nanoparticles formed from [Bu4N]5Na3(1,5-COD)IrI·P2W15Nb3O62 (hereafter [(COD)Ir·POM]8–), reduced by H2 in propylene carbonate solvent. Following a concise review of the (often-neglected) literature addressing dust in nucleation phenomena dating back t...

This work aims the preparation and catalytic use of copper(0) nanoparticles supported on ceria as catalyst in dehydrogenation of dimethylamine borane. They were in situ generated from the reduction of Cu²⁺/CeO2 during the catalytic dehydrogenation of dimethylamine borane in toluene. The results of characterization by using XRD, SEM, SEM-EDX, TEM, U...

Molybdenum(VI)–oxodiperoxo complex containing an oxazine ligand, ([MoO(O2)2(phox)], phox: 2-(2′-hydroxyphenyl)-5,6-dihydro-1,3-oxazine) was conveniently synthesized and immobilized onto chloro-functionalized mesoporous silica SBA-15 by covalent bonding between the chloropropyl group on the internal surface of the pores and the nitrogen atom of oxaz...

Cobalt(0) nanoparticles supported on nanoceria (Co0/CeO2) were prepared from the reduction of cobalt(II) ions impregnated on the surface of ceria nanopowders. The magnetic Co0/CeO2 catalyst could be isolated from the reaction solution by using a magnet and characterized by using ICP-OES, XRD, TEM, EDX, BET and XPS techniques. The results reveal tha...

A molybdenum(VI) oxido-diperoxido complex of salicylidene 2-picoloyl hydrazine (sal-phz) was synthesized and successfully grafted onto chloro-functionalised Fe3O4 nanoparticles. The resulting heterogeneous and magnetically recoverable nanoscale catalyst MoO3(sal-phz)/Fe3O4 was characterized by physicochemical and spectroscopic techniques. The activ...

The nucleation process yielding Ir(0)∼300 nanoparticles from (Bu4N)5Na3[(1,5-COD)Ir·P2W15Nb3O62] (abbreviated hereafter as (COD)Ir·POM(8-), where POM(9-) = the polyoxometalate, P2W15Nb3O62(9-)) under H2 is investigated to learn the true molecularity, and hence the associated kinetically effective nucleus (KEN), for nanoparticle formation for the fi...

Copper(0) nanoparticles, in situ generated from the reduction of copper(II) 2-ethylhexanoate during the dehydrogenation of dimethylamine borane (DMAB) at 50.0 ± 0.1 °C in toluene solution, are active catalyst in hydrogen generation from DMAB, but not very stable against agglomeration. Addition of 5.0 equivalent oleylamine (OAm) was found to stabili...

Ruthenium(0) nanoparticles supported on nanohafnia (Ru⁰/HfO2) were prepared by impregnation of ruthenium(III) cations on the surface of hafnia followed by their reduction with sodium borohydride at room temperature. Ru⁰/HfO2 samples were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical...

Three-dimensional (3D) porous metal and metal oxide nanostructures have received considerable interest because organization of inorganic materials into 3D nanomaterials holds extraordinary properties such as low density, high porosity, and high surface area. Supramolecular self-assembled peptide nanostructures were exploited as an organic template...

Three-dimensional (3D) porous metal and metal oxide nanostructures have received considerable interest because organization of inorganic materials into 3D nanomaterials holds extraordinary properties such as low density, high porosity, and high surface area. Supramolecular self-assembled peptide nanostructures were exploited as an organic template...

Ruthenium(0) nanoparticles supported on xonotlite nanowire (Ru(0)/X-NW) were prepared by the ion exchange of Ru³⁺ ions with Ca²⁺ ions in the lattice of xonotlite nanowire followed by their reduction with sodium borohydride in aqueous solution at room temperature. Ru(0)/X-NW show high catalytic activity and long life time in hydrogen generation from...

Ruthenium(0) nanoparticles supported on ceria (Ru(0)/CeO2) were in situ generated from the reduction of ruthenium(iii) ions impregnated on ceria during the hydrolysis of ammonia borane. Ru(0)/CeO2 was isolated from the reaction solution by centrifugation and characterized by ICP-OES, BET, XRD, TEM, SEM-EDS and XPS techniques. All the results reveal...

Palladium(0) nanoparticles continue to be important in the field of catalysis. However, and despite the many prior reports of Pd(0)n nanoparticles, missing is a study that reports the kinetically controlled formation of Pd(0)n nanoparticles with the simple stabilizer [Bu4N]2HPO4 in an established, balanced formation reaction where the kinetics and...

Palladium(0) nanoparticles supported on nanoceria (Pd0/CeO2) were prepared by the impregnation of palladium(II) ions on the surface of ceria followed by their reduction with sodium borohydride in aqueous solution at room temperature. Pd0/CeO2 were isolated from the reaction solution by centrifugation and characterized by ICP-OES, XRD, TEM, SEM-EDS...

A heterogeneous nanocatalyst was prepared via covalent anchoring of dioxomolybdenum(VI) Schiff base complex on core–shell structured Fe3O4@SiO2. The properties and the nature of the surface–fixed complex have been identified by a series of characterization techniques such as SEM, EDX, XRD, TGA, FT–IR and VSM. The synthesized hybrid material was an...

Magnetic ferrite nanopowders were coated with polydopamine which is inert against the hydrolysis of ammonia borane. Coating of ferrite powders was achieved by pH-induced self-polymerization of dopamine hydrochloride at room temperature. Palladium(0) nanoparticles supported on polydopamine coated ferrite (Pd⁰/PDA-Fe3O4) were prepared by impregnation...

Novel organic–inorganic hybrid heterogeneous nanocatalysts were obtained by covalent anchoring of a molybdenum(VI) complex of salicylidene 2-picoloyl hydrazine, MoO2(sal-phz)(CH3OH), (1) on the surface of magnetic nanoparticles functionalized by one of two routes: in the first method, the surface of magnetic nanoparticles is directly modified with...

Herein, we report the results of our study on the homogeneous catalytic dehydrogenation of dimethylamine borane in the presence of Ru(acac)3 and oleylamine (OAm) in toluene solution. The precatalyst system comprising Ru(acac)3 and 3 equivalent OAm shows the high catalytic activity in hydrogen generation from dimethylamine borane solution. Monitorin...

Rhodium(0) nanoparticles, supported on nanosized hydroxyapatite (Rh(0)/nanoHAP), were prepared by ion exchange of Rhþ3 ions with Caþ2 ions of hydroxyapatite, followed by reduction of the resulting Rhþ3/nanoHAP precatalyst during the catalytic methanolysis of ammonia borane (AB) in the presence of tetrabutylammonium dihydrogen phosphate (TBAP) at ro...

The catalytic activity of ruthenium(III) acetylacetonate was investigated for the first time in the dehydrogenation of dimethylamine borane. During catalytic reaction, a new ruthenium(II) species is formed in situ from the reduction of ruthenium(III) and characterized using UV-Visible, Fourier transform infrared (FTIR), 1H NMR, and mass spectrosco...

Reproducibility is the hallmark of reliable science. Reproducible synthetic procedures are of central importance in the chemical sciences, yet ⩾12% of syntheses submitted to publications that explicitly check procedures before their publication, such as Inorganic Syntheses and Organic Syntheses, are reported as having to be rejected since the submi...

Agglomerative sintering of an atomically dispersed, zeolite Y-supported catalyst, Ir1/zeolite Y, formed initially from the well-characterized precatalyst [Ir(C2H4)2]/zeolite Y, and in the presence of liquid-phase reactants, was monitored over three cycles of 3800 turnovers (TTOs) of cyclohexene hydrogenation at 72 °C. The catalyst evolved and sinte...

The Ziegler-type hydrogenation precatalyst dimer, [(1,5-COD)Ir(μ-O2C8H15)]2 (1,5-COD = 1,5-cyclooctadiene; O2C8H15 = 2-ethylhexanoate) plus added AlEt3 stabilizer has recently been shown to form AlEt3-stabilized, Ziegler-type Ir(0)∼4-15 nanoparticles initially, which then grow to larger Ziegler-type Ir(0)∼40-50 nanoparticles during the catalytic hy...

P-31-NMR spectroscopy was used to study the kinetics of the chelate ring-closure reaction in Cr(CO)(5) (DPPM) where DPPM is bis (diphenylphosphino)methane. DPPM is potentially a bidentate ligand, but in this complex it is coordinated to the transition metal in a monodentate fashion and therefore can undergo chelation. The thermal chelate ring-closu...

P-31-NMR spectroscopy was used to study the kinetics of the chelate ring-closure reaction in Cr(CO)(5) (DPPM) where DPPM is bis (diphenylphosphino)methane. DPPM is potentially a bidentate ligand, but in this complex it is coordinated to the transition metal in a monodentate fashion and therefore can undergo chelation. The thermal chelate ring-closu...

Zinc borate was prepared from the reaction of zinc oxide and boric acid in the absence or presence of cumene terminated poly(styrene-co-maleic anhydride), PSMA, added as a surfactant at varying concentrations (0.1-1 wt.% of water) to the reaction medium to investigate its effect on the growth and agglomeration of particles during reaction. Synthesi...

Flame retardancy of poly(ethylene terephthalate), PET, was improved using different flame retardant additives such as triphenylphosphate, triphenylphosphine oxide, zinc borate, and boron phosphate (BP). Composites were prepared using a twin screw extruder and subsequently injection molded for characterization purposes. The flame retardancy of the c...

Herein, we report the in situ generation, isolation and characterization of cobalt(0) nanoparticles, stabilized by poly(4-styrenesulfonic acid-co-maleic acid), PSSMA, and their catalytic activity in the hydrolysis of hydrazine borane (HB). Cobalt(0) nanoparticles having average particle size of 3.1 ± 0.5 nm were prepared by in situ reduction of cob...

Ruthenium(0) nanoparticles supported on magnetic silica-coated cobalt ferrite (Ru(0)/SiO2-CoFe2O4) were in situ generated from the reduction of Ru3+/SiO2-CoFe2O4 during the catalytic hydrolysis of ammonia-borane (AB). Ruthenium(III) ions were impregnated on SiO2-CoFe2O4 from the aqueous solution of ruthenium(III) chloride and then reduced by AB at...

Novel mesostructured hybrid materials containing a molybdenum Schiff base complex grafted on the internal surface of SBA-15 pores were prepared by introducing MoO2(acac)2 into a mesoporous silica functionalized with Schiff base ligands. The SBA-15 supports modified by an amine or salicylaldehyde were obtained by cocondensation of tetraethylorthosil...

Electrochemical behavior of hydrazine borane (HB) was investigated on gold electrode in 0.5 M LiClO4 solution in methanol using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and chronoamperometry. Two irreversible peaks at 164 and 530 mV are attributed to direct electro-oxidation of HB on gold electrode in methanol. Both EIS resu...

The development of readily prepared effective heterogeneous catalysts for hydrogen generation from ammonia-borane (AB; NH3BH3) solution under mild conditions still remains a challenge in the field of "hydrogen economy". In this study, we report our finding of an in situ generated, highly active ruthenium nanocatalyst for the dehydrogenation of ammo...

Ruthenium(0) nanoparticles supported on the surface of titania nanospheres (Ru(0)/TiO2) were in situ generated from the reduction of ruthenium(III) ions impregnated on nanotitania during the hydrolysis of ammonia borane. They were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniq...

A detailed reproducible synthesis procedure of high-purity [Bu4N] 9P2W15Nb3O62 from Na12 [α-P2W15O56]·56H2O is given.

An improved synthetic procedure is reported for reliably producing the highest available purity [(n-C4H9)4N]9P2W15Nb3O62 to date. The experimentally independently checked procedure is the result of additional extensive experimentation over ca. 2 years and above the six prior syntheses, including an Inorganic Syntheses procedure. Considerable emphas...

Rhodium(0) nanoparticles supported on the surface of titanium dioxide (Rh(0)@TiO 2) were in situ generated from the reduction of rhodium(III) ions impregnated on nanotitania during the hydrolysis of ammonia borane. They were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniques. T...

Ruthenium(0) nanoparticles supported on xonotlite nanowire (Ru(0)@X-NW) were prepared by the ion exchange of Ru(3+) ions with Ca(2+) ions in the lattice of xonotlite nanowire followed by their reduction with sodium borohydride in aqueous solution at room temperature. Ru(0)@X-NW were characterized by a combination of advanced analytical techniques....