A general synthesis approach for supported bimetallic nanoparticles via surface inorganometallic chemistry

The synthesis of ultrasmall supported bimetallic nanoparticles (between 1 and 3 nanometers in diameter) with well-defined stoichiometry and intimacy between constituent metals remains a substantial challenge. We synthesized 10 different supported bimetallic nanoparticles via surface inorganometallic chemistry by decomposing and reducing surface-adsorbed heterometallic double complex salts, which are readily obtained upon sequential adsorption of target cations and anions on a silica substrate. For example, adsorption of tetraamminepalladium(II) [Pd(NH3)42+] followed by adsorption of tetrachloroplatinate [PtCl42−] was used to form palladium-platinum (Pd-Pt) nanoparticles. These supported bimetallic nanoparticles show enhanced catalytic performance in acetylene selective hydrogenation, which clearly demonstrates a synergistic effect between constituent metals.

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Hollow porous nanoparticles with Pt skin on a Ag–Pt alloy structure as a highly active electrocatalyst for the oxygen reduction reaction

Journal of Materials Chemistry A ◽

10.1039/c6ta02202b ◽

2016 ◽

Vol 4 (22) ◽

pp. 8803-8811 ◽

Cited By ~ 70

Author(s):

Tao Fu ◽

Jun Fang ◽

Chunsheng Wang ◽

Jinbao Zhao

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Bimetallic Nanoparticles ◽

Pt Nanoparticles ◽

Catalytic Performance ◽

Reduction Reaction ◽

Alloy Structure ◽

Highly Active ◽

Porous Nanoparticles ◽

Pt Alloy

Novel hollow porous Ag–Pt bimetallic nanoparticles with better ORR catalytic performance than commercial Pt/C and Ag@Pt nanoparticles.

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Electro-catalytically active Au@Pt nanoparticles for hydrogen evolution reaction: an insight into a tryptophan mediated supramolecular interface towards a universal core–shell synthesis approach

RSC Advances ◽

10.1039/c4ra08365b ◽

2014 ◽

Vol 4 (89) ◽

pp. 48458-48464 ◽

Cited By ~ 16

Author(s):

Sarvesh Kumar Srivastava ◽

Jonathan Sabaté del Río ◽

Ciara K. O'Sullivan ◽

Chiaki Ogino ◽

Akihiko Kondo

Keyword(s):

Room Temperature ◽

Bimetallic Nanoparticles ◽

Pt Nanoparticles ◽

Aqueous Environment ◽

Rapid Synthesis ◽

One Pot ◽

Temperature Method ◽

Catalytically Active ◽

Synthesis Approach ◽

Insight Into

We report an eco-friendly, one-pot, room-temperature method for the rapid synthesis of electrocatalytically active Au@Pt (50 nm) bimetallic nanoparticles via tryptophan (Trp) induced interface in an aqueous environment.

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Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

10.26434/chemrxiv.11537661 ◽

2020 ◽

Author(s):

Elisabeth Hofmeister ◽

Jisoo Woo ◽

Tobias Ullrich ◽

Lydia Petermann ◽

Kevin Hanus ◽

...

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Systematic Study ◽

Cobalt Complexes ◽

Spectroscopic Studies ◽

Double Complex ◽

Double Complex Salts ◽

Noble Metal Catalysts ◽

Reduction Potentials ◽

Complex Salts

Cobaloximes and their BF2-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)2py2]+[Co(dmgBPh2)2Cl2]- can be obtained in good yields by treatment of commercially available [Co(dmgh)2pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

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Preparation and Photocatalytic Performance for Degradation of Rhodamine B of AgPt/Bi4Ti3O12 Composites

Nanomaterials ◽

10.3390/nano10112206 ◽

2020 ◽

Vol 10 (11) ◽

pp. 2206

Author(s):

Gaoqian Yuan ◽

Gen Zhang ◽

Kezhuo Li ◽

Faliang Li ◽

Yunbo Cao ◽

...

Keyword(s):

Visible Light ◽

Noble Metal ◽

Rhodamine B ◽

Photocatalytic Performance ◽

Bimetallic Nanoparticles ◽

Resonance Effect ◽

Visible Region ◽

Photogenerated Electron ◽

Pt Nanoparticles ◽

Electron Hole

Loading a noble metal on Bi4Ti3O12 could enable the formation of the Schottky barrier at the interface between the former and the latter, which causes electrons to be trapped and inhibits the recombination of photoelectrons and photoholes. In this paper, AgPt/Bi4Ti3O12 composite photocatalysts were prepared using the photoreduction method, and the effects of the type and content of noble metal on the photocatalytic performance of the catalysts were investigated. The photocatalytic degradation of rhodamine B (RhB) showed that the loading of AgPt bimetallic nanoparticles significantly improved the catalytic performance of Bi4Ti3O12. When 0.10 wt% noble metal was loaded, the degradation rate for RhB of Ag0.7Pt0.3/Bi4Ti3O12 was 0.027 min−1, which was respectively about 2, 1.7 and 3.7 times as that of Ag/Bi4Ti3O12, Pt/Bi3Ti4O12 and Bi4Ti3O12. The reasons may be attributed as follows: (i) the utilization of visible light was enhanced due to the surface plasmon resonance effect of Ag and Pt in the visible region; (ii) Ag nanoparticles mainly acted as electron acceptors to restrain the recombination of photogenerated electron-hole pairs under visible light irradiation; and (iii) Pt nanoparticles acted as electron cocatalysts to further suppress the recombination of photogenerated electron-hole pairs. The photocatalytic performance of Ag0.7Pt0.3/Bi4Ti3O12 was superior to that of Ag/Bi4Ti3O12 and Pt/Bi3Ti4O12 owing to the synergistic effect between Ag and Pt nanoparticles.

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Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

Nature Communications ◽

10.1038/s41467-021-22946-y ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Tao Gan ◽

Jingxiu Yang ◽

David Morris ◽

Xuefeng Chu ◽

Peng Zhang ◽

...

Keyword(s):

Catalytic Oxidation ◽

Pt Nanoparticles ◽

Catalytic Performance ◽

Nitrogen Vacancy ◽

Innovative Strategy ◽

Oxide Supports ◽

Heterogeneous Catalytic ◽

Highly Active ◽

Electron Sink ◽

Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

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A general synthesis approach in action: preparation and characterization of polyoxomolybdenum(vi) organophosphonates through oxidative Mo–Mo bond cleavage in {MoV2O4}

CrystEngComm ◽

10.1039/c2ce25093d ◽

2012 ◽

Vol 14 (14) ◽

pp. 4826 ◽

Cited By ~ 9

Author(s):

Lijuan Zhang ◽

Jingmei Sun ◽

Yunshan Zhou ◽

Sadaf ul Hassan ◽

Enbo Wang ◽

...

Keyword(s):

Bond Cleavage ◽

Action Preparation ◽

General Synthesis ◽

Synthesis Approach

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Tuning the Reaction Selectivity over MgAl Spinel-Supported Pt Catalyst in Furfuryl Alcohol Conversion to Pentanediols

Catalysts ◽

10.3390/catal11040415 ◽

2021 ◽

Vol 11 (4) ◽

pp. 415

Author(s):

Xinsheng Li ◽

Jifeng Pang ◽

Jingcai Zhang ◽

Xianquan Li ◽

Yu Jiang ◽

...

Keyword(s):

Furfuryl Alcohol ◽

Pt Nanoparticles ◽

Catalytic Performance ◽

Major Product ◽

Pt Catalyst ◽

Reaction Products ◽

Strong Base ◽

Reaction Selectivity ◽

Supported Pt Catalysts ◽

Alcohol Conversion

Catalytic conversion of biomass-derived feedstock to high-value chemicals is of remarkable significance for alleviating dependence on fossil energy resources. MgAl spinel-supported Pt catalysts were prepared and used in furfuryl alcohol conversion. The approaches to tune the reaction selectivity toward pentanediols (PeDs) were investigated and the catalytic performance was correlated to the catalysts’ physicochemical properties based on comprehensive characterizations. It was found that 1–8 wt% Pt was highly dispersed on the MgAl2O4 support as nanoparticles with small sizes of 1–3 nm. The reaction selectivity did not show dependence on the size of Pt nanoparticles. Introducing LiOH onto the support effectively steered the reaction products toward the PeDs at the expense of tetrahydrofurfuryl alcohol (THFA) selectivity. Meanwhile, the major product in PeDs was shifted from 1,5-PeD to 1,2-PeD. The reasons for the PeDs selectivity enhancement were attributed to the generation of a large number of medium-strong base sites on the Li-modified Pt catalyst. The reaction temperature is another effective factor to tune the reaction selectivity. At 230 °C, PeDs selectivity was enhanced to 77.4% with a 1,2-PeD to 1,5-PeD ratio of 3.7 over 4Pt/10Li/MgAl2O4. The Pt/Li/MgAl2O4 catalyst was robust to be reused five times without deactivation.

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Ruling Factors in Cinnamaldehyde Hydrogenation: Activity and Selectivity of Pt-Mo Catalysts

Nanomaterials ◽

10.3390/nano11020362 ◽

2021 ◽

Vol 11 (2) ◽

pp. 362

Author(s):

Marta Stucchi ◽

Maela Manzoli ◽

Filippo Bossola ◽

Alberto Villa ◽

Laura Prati

Keyword(s):

Photoelectron Spectroscopy ◽

Pt Nanoparticles ◽

Carbon Support ◽

Catalytic Performance ◽

Acid Sites ◽

Hydrogenation Catalysts ◽

Cinnamaldehyde Hydrogenation ◽

Transmission Electron ◽

Heat Treated ◽

Heating Treatment

To obtain selective hydrogenation catalysts with low noble metal content, two carbon-supported Mo-Pt bimetallic catalysts have been synthesized from two different molybdenum precursors, i.e., Na2MoO4 and (NH4)6Mo7O24. The results obtained by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) combined with the presence and strength of acid sites clarified the different catalytic behavior toward cinnamaldehyde hydrogenation. After impregnating the carbon support with Mo precursors, each sample was used either as is or treated at 400 °C in N2 flow, as support for Pt nanoparticles (NPs). The heating treatment before Pt deposition had a positive effect on the catalytic performance. Indeed, TEM analyses showed very homogeneously dispersed Pt NPs only when they were deposited on the heat-treated Mo/C supports, and XPS analyses revealed an increase in both the exposure and reduction of Pt, which was probably tuned by different MoO3/MoO2 ratios. Moreover, the different acid properties of the catalysts resulted in different selectivity.

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