Synthesis and catalytic properties of bimetallic nanomaterials with various architectures

Liu, Xiangwen; Wang, Dingsheng; Li, Yadong

doi:10.1016/j.nantod.2012.08.003

Cited by 475 publications

(299 citation statements)

References 151 publications

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“…[1][2][3] Specifically, bimetallic Pt-Ru nanoclusters and nanoparticles are of interest due to their high activity for the oxidation of methanol and other small organic molecules, e.g., in polymer electrolyte fuel cells. 4,5 However, in these real catalysts, it is hard to assess the origin of the catalytic activity, thus prompting analysis of model catalyst systems of the type considered here.…”

Section: Introductionmentioning

confidence: 99%

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Han

Engstfeld

Behm

et al. 2013

The Journal of Chemical Physics

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The formation of Pt-Ru nanoclusters (NCs) by sequential deposition of Pt and Ru on a periodically rumpled graphene sheet supported on Ru(0001) is analyzed by atomistic-level modeling and kinetic Monte Carlo simulations. The "coarse-scale" periodic variation of the adsorption energy of metal adatoms across the graphene sheet directs the assembly of NCs to a periodic array of thermodynamically preferred locations. The modeling describes not only just the NC densities and size distributions, but also the composition distribution for mixed NCs. A strong dependence of these quantities on the deposition order is primarily related to different effective mobilities of Pt and Ru on the supported graphene. Disciplines Biological and Chemical Physics CommentsThe following article appeared in Journal of Chemical Physics 138,13 (2013) The formation of Pt-Ru nanoclusters (NCs) by sequential deposition of Pt and Ru on a periodically rumpled graphene sheet supported on Ru(0001) is analyzed by atomistic-level modeling and kinetic Monte Carlo simulations. The "coarse-scale" periodic variation of the adsorption energy of metal adatoms across the graphene sheet directs the assembly of NCs to a periodic array of thermodynamically preferred locations. The modeling describes not only just the NC densities and size distributions, but also the composition distribution for mixed NCs. A strong dependence of these quantities on the deposition order is primarily related to different effective mobilities of Pt and Ru on the supported graphene.

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Section: Introductionmentioning

confidence: 99%

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Han

Engstfeld

Behm

et al. 2013

The Journal of Chemical Physics

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“…33 Therefore, CO is expected to desorb at binding energies weaker than the energy of this equilibrium and, indeed, CO is the major product on these two metals, as measured experimentally. [34][35][36][37][38] If the CO 2 reduction is conducted in parallel to water reduction, it is possible to produce syngas (CO + H 2 ), which is, as mentioned before, an important feedstock for the chemical industry. Au and Ag can attend such requirement, however, for practical applications, the use of non-noble metal-based electrocatalysts would be desirable, and this is a difficult challenge in research.…”

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confidence: 99%

Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography

Camilo¹,

Silva²,

Lima³

2017

J. Braz. Chem. Soc.

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The carbon dioxide electrocatalytic reduction is central for the development of regenerative cycles of electrochemical energy conversion and storage. Herein, the gaseous products of the CO 2 electroreduction were monitored by using an electrochemical cell on line coupled to a differential electrochemical mass spectrometer (DEMS), aiming at searching for electrocatalysts with high selectivity for CO formation. The results showed that, among the studied materials, the Cu 4 Sn/C alloy nanoparticles were stable during potentiostatic polarizations as revealed by in situ X-ray absorption spectroscopy (XAS), and the on line DEMS measurements showed the production of CO, suppression of methane and ethylene formations, and diminishing of the hydrogen evolution reaction, in relation to that on pure Cu 2 O-Cu/C. The faradaic efficiencies for CO formation were 13 and 23% for Cu 4 Sn/C and Au/C (a known electrocatalyst for CO), respectively, determined by experiments of in line gas chromatography (GC). The selectivity of Cu 4 Sn/C for CO formation was ascribed to the role of Sn atoms on stabilizing adsorbed HCOO intermediates, and hindering further hydrogenation, letting CO free for desorption. These results are expected to be used as a guide for further development of electrocatalysts with a fine-tuning of composition for increasing the faradaic efficiency of CO 2 electroreduction to CO.Keywords: CO 2 electrochemical reduction, on line DEMS, in line GC, CO formation, Cu 4 Sn/C alloy IntroductionConcomitantly with the growth of the world population, the energy demand is increasing. To satisfy this scenario, fossil fuels, such as oil, coal and natural gas, are being exhaustively used. Unfortunately, together to the dependence on these fuels, large amounts of carbon dioxide (CO 2 ) are emitted into the environment and, so, this is not a sustainable cycle. This has initiated research projects to investigate efficient processes for using the available CO 2 in the atmosphere. The electrochemical reduction of carbon dioxide is, in principle, an efficient manner that can be explored. In this context, the electroreduction of CO 2 to fuels with high-energy density or to industrial chemicals, that can be further processed to produce useful fuels, such as CO, using photovoltaic panels, with the consecutive utilization as fuel in fuel cells, would define a sustainable or regenerative cycle. [1][2][3][4][5][6][7] In the case of performing the CO 2 electroreduction to CO in parallel with the water electroreduction (or the hydrogen evolution reaction (HER)), the mixture CO + H 2 (syngas) is produced. 8,9 In the chemical industry, CO/H 2 mixtures are reacted to form methanol or other liquid fuels, such as diesel, by using the Fischer-Tropsch process. 10 The CO 2 electrochemical reduction can be productselective by using different electrocatalysts. However, even for two-electron products, it is decisive to know the kinetically important steps of the studied reaction. Also, synthesizing an optimized electrocatalyst that do not catalyze undesi...

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“…As shown in Figure 1, there are normally six different structures available for bimetallic catalysts: crown-jewel structure, hollow structure, hetero-structure, core-shell structure, and alloyed structure [32]. The Crown-jewel structure is described as being the case where the atoms of one of the elements are pulled together in a controlled fashion on the surface of the other metal at unique points.…”

Section: Structures Of Bimetallic Nanocatalystsmentioning

confidence: 99%

Bimetallic Catalysts Containing Gold and Palladium for Environmentally Important Reactions

2016

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Supported bimetallic nanoparticles (SBN) are extensively used as efficient redox catalysts. This kind of catalysis particularly using SBN has attracted immense research interest compared to their parent metals due to their unique physico-chemical properties. The primary objective of this contribution is to provide comprehensive overview about SBN and their application as promising catalysts. The present review contains four sections in total. Section 1 starts with a general introduction, recent progress, and brief summary of the application of SBN as promising catalysts for different applications. Section 2 reviews the preparation and characterization methods of SBN for a wide range of catalytic reactions. Section 3 concentrates on our own results related to the application of SBN in heterogeneous catalysis. In this section, the oxidation of cyclohexane to adipic acid (an eco-friendly and novel approach) will be discussed. In addition, the application of bimetallic Pd catalysts for vapor phase toluene acetoxylation in a fixed bed reactor will also be highlighted. Acetoxylation of toluene to benzyl acetate is another green route to synthesize benzyl acetate in one step. Finally, Section 1 describes the summary of the main points and also presents an outlook on the application of SBN as promising catalysts for the production of valuable products.

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Synthesis and catalytic properties of bimetallic nanomaterials with various architectures

Cited by 475 publications

References 151 publications

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Atomistic modeling of the directed-assembly of bimetallic Pt-Ru nanoclusters on Ru(0001)-supported monolayer graphene

Investigation of Electrocatalysts for Selective Reduction of CO2 to CO: Monitoring the Reaction Products by on line Mass Spectrometry and Gas Chromatography

Bimetallic Catalysts Containing Gold and Palladium for Environmentally Important Reactions

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