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Chen PC, Gao M, McCandler CA, Song C, Jin J, Yang Y, Maulana AL, Persson KA, Yang P. Complete miscibility of immiscible elements at the nanometre scale. NATURE NANOTECHNOLOGY 2024; 19:775-781. [PMID: 38429491 DOI: 10.1038/s41565-024-01626-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 02/02/2024] [Indexed: 03/03/2024]
Abstract
Understanding the mixing behaviour of elements in a multielement material is important to control its structure and property. When the size of a multielement material is decreased to the nanoscale, the miscibility of elements in the nanomaterial often changes from its bulk counterpart. However, there is a lack of comprehensive and quantitative experimental insight into this process. Here we explored how the miscibility of Au and Rh evolves in nanoparticles of sizes varying from 4 to 1 nm and composition changing from 15% Au to 85% Au. We found that the two immiscible elements exhibit a phase-separation-to-alloy transition in nanoparticles with decreased size and become completely miscible in sub-2 nm particles across the entire compositional range. Quantitative electron microscopy analysis and theoretical calculations were used to show that the observed immiscibility-to-miscibility transition is dictated by particle size, composition and possible surface adsorbates present under the synthesis conditions.
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Affiliation(s)
- Peng-Cheng Chen
- Kavli Energy Nanoscience Institute, University of California, Berkeley, CA, USA
- Department of Chemistry, University of California, Berkeley, CA, USA
- Department of Materials Science, Fudan University, Shanghai, China
| | - Mengyu Gao
- Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
| | - Caitlin A McCandler
- Kavli Energy Nanoscience Institute, University of California, Berkeley, CA, USA
- Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
| | - Chengyu Song
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Jianbo Jin
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Yao Yang
- Department of Chemistry, University of California, Berkeley, CA, USA
- Miller Institute, University of California, Berkeley, CA, USA
| | - Arifin Luthfi Maulana
- Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
| | - Kristin A Persson
- Kavli Energy Nanoscience Institute, University of California, Berkeley, CA, USA
- Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Peidong Yang
- Kavli Energy Nanoscience Institute, University of California, Berkeley, CA, USA.
- Department of Chemistry, University of California, Berkeley, CA, USA.
- Department of Materials Science and Engineering, University of California, Berkeley, CA, USA.
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2
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Yu J, Qin X, Yang Y, Lv M, Yin P, Wang L, Ren Z, Song B, Li Q, Zheng L, Hong S, Xing X, Ma D, Wei M, Duan X. Highly Stable Pt/CeO 2 Catalyst with Embedding Structure toward Water-Gas Shift Reaction. J Am Chem Soc 2024; 146:1071-1080. [PMID: 38157430 DOI: 10.1021/jacs.3c12061] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Strong metal-support interaction (SMSI) has been extensively studied in heterogeneous catalysis because of its significance in stabilizing active metals and tuning catalytic performance, but the origin of SMSI is not fully revealed. Herein, by using Pt/CeO2 as a model catalyst, we report an embedding structure at the interface between Pt and (110) plane of CeO2, where Pt clusters (∼1.6 nm) are embedded into the lattice of ceria within 3-4 atomic layers. In contrast, this phenomenon is absent in the CeO2(100) support. This unique geometric structure, as an effective motivator, triggers more significant electron transfer from Pt clusters to CeO2(110) support accompanied by the formation of interfacial structure (Ptδ+-Ov-Ce3+), which plays a crucial role in stabilizing Pt nanoclusters. A comprehensive investigation based on experimental studies and theoretical calculations substantiates that the interfacial sites serve as the intrinsic active center toward water-gas shift reaction (WGSR), featuring a moderate strength CO activation adsorption and largely decreased energy barrier of H2O dissociation, accounting for the prominent catalytic activity of Pt/CeO2(110) (a reaction rate of 15.76 molCO gPt-1 h-1 and a turnover frequency value of 2.19 s-1 at 250 °C). In addition, the Pt/CeO2(110) catalyst shows a prominent durability within a 120 h time-on-stream test, far outperforming the Pt/CeO2(100) one, which demonstrates the advantages of this embedding structure for improving catalyst stability.
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Affiliation(s)
- Jun Yu
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, P. R. China
| | - Xuetao Qin
- College of Chemistry and Molecular Engineering and College of Engineering, BIC-ESAT, Peking University, Beijing 100871, P. R. China
| | - Yusen Yang
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, P. R. China
| | - Mingxin Lv
- Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China
| | - Pan Yin
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Lei Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, P. R. China
| | - Zhen Ren
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Boyu Song
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Qiang Li
- Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China
| | - Lirong Zheng
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Song Hong
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xianran Xing
- Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China
| | - Ding Ma
- College of Chemistry and Molecular Engineering and College of Engineering, BIC-ESAT, Peking University, Beijing 100871, P. R. China
| | - Min Wei
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, P. R. China
| | - Xue Duan
- State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
- Quzhou Institute for Innovation in Resource Chemical Engineering, Quzhou 324000, P. R. China
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3
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Goyhenex C. Rationalization of the sub-surface segregation in nanoalloys of weakly miscible metals. NANOSCALE 2022; 14:16627-16638. [PMID: 36321585 DOI: 10.1039/d2nr04364e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The origin of the stability of sub-surface precipitates in core-shell bimetallic nanoparticles is investigated from the perspective of atomic-size effects for systems where the core atoms have a size equal to, or lower than, the shell atoms. With the aim of providing more general assessments, a systematic study is proposed by considering three model systems combining weakly miscible metals: IrPd (negligible lattice mismatch, Δr/rPd = -1%), AuRh (moderate lattice mismatch, Δr/rAu = -7%) and AuCo (large lattice mismatch, Δr/rAu = -13%). The main driving forces for sub-surface segregation and the characteristic core morphologies are quantified from the combination of Monte Carlo and quenched molecular dynamics simulations. The preferential occupation of the sub-surface shell by an impurity of Ir or (Co or Rh) in a Pd or Au nanoparticle, respectively, in particular at the sub-vertex sites, is found to be a common feature in these dilute nanosystems. With the help of a model of the decomposition of the segregation enthalpies, it is shown that the dominant driving forces leading to the preferential sub-surface segregation at the vertex sites can be very different from one system to another: atomic size (AuCo, large lattice mismatch), coupled alloy-size-cohesion (AuRh, moderate lattice mismatch) or coupled alloy-cohesion (IrPd, negligible lattice mismatch) effects. As a consequence, in the core-shell nanoalloys, in the first stage of enrichment of an Au nanoparticle with Co or Rh core atoms, or a Pd nanoparticle with Ir core atoms, all the equilibrium structures consist of similar off-center solute clusters anchored at sub-vertex sites, and this is regardless of the lattice mismatch.
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Affiliation(s)
- Christine Goyhenex
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504, 23 rue du Lœss, BP 43, F-67034 Strasbourg, Cedex 2, France.
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Ball-Cup, Janus, core-shell and disordered-alloy rhodium-gold nanoparticles: An atomistic simulation on structural stability. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hao J, Liu B, Maenosono S, Yang J. One-pot synthesis of Au-M@SiO 2 (M = Rh, Pd, Ir, Pt) core-shell nanoparticles as highly efficient catalysts for the reduction of 4-nitrophenol. Sci Rep 2022; 12:7615. [PMID: 35538150 PMCID: PMC9091199 DOI: 10.1038/s41598-022-11756-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 04/28/2022] [Indexed: 12/15/2022] Open
Abstract
The conversion of p-nitrophenol (4-NP) to p-aminophenol (4-AP) is of great significance for pharmaceutical and material manufacturing. In this work, Au-M@SiO2 (M = Rh, Pd, Ir, Pt) nanoparticles (NPs) with core-shell structures, which are expected to be excellent catalysts for the transformation of 4-NP to 4-AP, were synthesized by a facile one-pot one-step method. The structure and composition of the NPs were characterized through transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core-shell NPs showed excellent catalytic activity in the reduction of 4-NP, which is superior to most catalysts reported in the previous literature. The enhanced catalytic activity of Au-M@SiO2 core-shell NPs is presumably related to the bimetallic synergistic effect. This study provides a simple strategy to synthesize core-shell bimetallic NPs for catalytic applications.
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Affiliation(s)
- Junfang Hao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, People's Republic of China
| | - Bin Liu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, People's Republic of China
| | - Shinya Maenosono
- School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan.
| | - Jianhui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Shaanxi Key Laboratory of Physico-Inorganic Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an, 710069, People's Republic of China.
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6
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Zaera F. Designing Sites in Heterogeneous Catalysis: Are We Reaching Selectivities Competitive With Those of Homogeneous Catalysts? Chem Rev 2022; 122:8594-8757. [PMID: 35240777 DOI: 10.1021/acs.chemrev.1c00905] [Citation(s) in RCA: 69] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A critical review of different prominent nanotechnologies adapted to catalysis is provided, with focus on how they contribute to the improvement of selectivity in heterogeneous catalysis. Ways to modify catalytic sites range from the use of the reversible or irreversible adsorption of molecular modifiers to the immobilization or tethering of homogeneous catalysts and the development of well-defined catalytic sites on solid surfaces. The latter covers methods for the dispersion of single-atom sites within solid supports as well as the use of complex nanostructures, and it includes the post-modification of materials via processes such as silylation and atomic layer deposition. All these methodologies exhibit both advantages and limitations, but all offer new avenues for the design of catalysts for specific applications. Because of the high cost of most nanotechnologies and the fact that the resulting materials may exhibit limited thermal or chemical stability, they may be best aimed at improving the selective synthesis of high value-added chemicals, to be incorporated in organic synthesis schemes, but other applications are being explored as well to address problems in energy production, for instance, and to design greener chemical processes. The details of each of these approaches are discussed, and representative examples are provided. We conclude with some general remarks on the future of this field.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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7
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Vanzan M, Jones RM, Corni S, D'Agosta R, Baletto F. Exploring AuRh nanoalloys: a computational perspective on the formation and physical properties. Chemphyschem 2022; 23:e202200035. [PMID: 35156760 PMCID: PMC9314847 DOI: 10.1002/cphc.202200035] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/09/2022] [Indexed: 11/12/2022]
Abstract
We studied the formation of AuRh nanoalloys (between 20–150 atoms) in the gas phase by means of Molecular Dynamics (MD) calculations, exploring three possible formation processes: one‐by‐one growth, coalescence, and nanodroplets annealing. As a general trend, we recover a predominance of Rh@Au core‐shell ordering over other chemical configurations. We identify new structural motifs with enhanced thermal stabilities. The physical features of those selected systems were studied at the Density Functional Theory (DFT) level, revealing profound correlations between the nanoalloys morphology and properties. Surprisingly, the arrangement of the inner Rh core seems to play a dominant role on nanoclusters’ physical features like the HOMO‐LUMO gap and magnetic moment. Strong charge separations are recovered within the nanoalloys suggesting the existence of charge‐transfer transitions.
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Affiliation(s)
- Mirko Vanzan
- University of Padova: Universita degli Studi di Padova, Department of Chemical Sciences, Via Marzolo 1, 35131, Padova, ITALY
| | | | - Stefano Corni
- University of Padova: Universita degli Studi di Padova, Chemical Sciences, ITALY
| | - Roberto D'Agosta
- University of the Basque Country: Universidad del Pais Vasco, Physics, SPAIN
| | - Francesca Baletto
- King's College London, Physics, Strand, WC2R 2LS, London, UNITED KINGDOM
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8
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Salem M, Cowan MJ, Mpourmpakis G. Predicting Segregation Energy in Single Atom Alloys Using Physics and Machine Learning. ACS OMEGA 2022; 7:4471-4481. [PMID: 35155939 PMCID: PMC8830057 DOI: 10.1021/acsomega.1c06337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
Single atom alloys (SAAs) show great promise as catalysts for a wide variety of reactions due to their tunable properties, which can enhance the catalytic activity and selectivity. To design SAAs, it is imperative for the heterometal dopant to be stable on the surface as an active catalytic site. One main approach to probe SAA stability is to calculate surface segregation energy. Density functional theory (DFT) can be applied to investigate the surface segregation energy in SAAs. However, DFT is computationally expensive and time-consuming; hence, there is a need for accelerated frameworks to screen metal segregation for new SAA catalysts across combinations of metal hosts and dopants. To this end, we developed a model that predicts surface segregation energy using machine learning for a series of SAA periodic slabs. The model leverages elemental descriptors and features inspired by the previously developed bond-centric model. The initial model accurately captures surface segregation energy across a diverse series of FCC-based SAAs with various surface facets and metal-host pairs. Following our machine learning methodology, we expanded our analysis to develop a new model for SAAs formed from FCC hosts with FCC, BCC, and HCP dopants. Our final, five-feature model utilizes second-order polynomial kernel ridge regression. The model is able to predict segregation energies with a high degree of accuracy, which is due to its physically motivated features. We then expanded our data set to test the accuracy of the five features used. We find that the retrained model can accurately capture E seg trends across different metal hosts and facets, confirming the significance of the features used in our final model. Finally, we apply our pretrained model to a series of Ir- and Pd-based SAA cuboctahedron nanoparticles (NPs), ranging in size and FCC dopants. Remarkably, our model (trained on periodic slabs) accurately predicts the DFT segregation energies of the SAA NPs. The results provide further evidence supporting the use of our model as a general tool for the rapid prediction of SAA segregation energies. By creating a framework to predict the metal segregation from bulk surfaces to NPs, we can accelerate the SAA catalyst design while simultaneously unraveling key physicochemical properties driving thermodynamic stabilization of SAAs.
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Jašik J, Fortunelli A, Vajda S. Exploring the materials space in the smallest particle size range: From heterogeneous catalysis to electrocatalysis and photocatalysis. Phys Chem Chem Phys 2022; 24:12083-12115. [DOI: 10.1039/d1cp05677h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ultrasmall clusters of subnanometer size can possess unique and even unexpected physical and chemical propensities which make them interesting in various fields of basic science and for potential applications, such...
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10
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Settem M, Srivastav AK, Kanjarla AK. Understanding the strain-dependent structure of Cu nanocrystals in Ag-Cu nanoalloys. Phys Chem Chem Phys 2021; 23:26165-26177. [PMID: 34797355 DOI: 10.1039/d1cp04145b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The structure of octahedral Ag-Cu nanoalloys is investigated by means of basin hopping Monte Carlo (BHMC) searches involving the optimization of shape and chemical ordering. Due to the significant size mismatch between Ag and Cu, the misfit strain plays a key role in determining the structure of Ag-Cu nanoalloys. At all the compositions, segregated chemical ordering is observed. However, the shape of the Cu nanocrystal and the associated defects are significantly different. At lower amounts of Cu (as little as 2 atom %), defects close to the surface are observed leading to a highly non-compact shape of the Cu nanocrystal which is non-trivial. The number of Cu-Cu bonds is relatively lower in the non-compact shape which is contrary to the preference of bulk Ag-Cu alloys to maximize the homo-atomic bonds. Due to the non-compact shape, {100} Ag-Cu interfaces are observed which are not expected. As the amount of Cu increases, the Cu nanocrystal undergoes a shape transition from non-compact to a compact octahedron. The associated defect structure is also modified. The structural changes due to the strain effects have been explained by calculating the atomic pressure maps and the bond length distributions. The trends relating to the structure have also been verified at larger sizes.
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Affiliation(s)
- Manoj Settem
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.
| | - Ajeet K Srivastav
- Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, 440010, India
| | - Anand K Kanjarla
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India. .,Ceramic Technologies Group - Center of Excellence in Materials and Manufacturing for Futuristic Mobility, Indian Institute of Technology Madras, Chennai, 600036, India
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11
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12
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Torres AE, Rodríguez-Pineda J, Zanella R. Relevance of Dispersion and the Electronic Spin in the DFT + U Approach for the Description of Pristine and Defective TiO 2 Anatase. ACS OMEGA 2021; 6:23170-23180. [PMID: 34549118 PMCID: PMC8444202 DOI: 10.1021/acsomega.1c02761] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/19/2021] [Indexed: 05/05/2023]
Abstract
A density functional theory + U systematic theoretical study was performed on the geometry, electronic structure, and energies of properties relevant for the chemical reactivity of TiO2 anatase. The effects of D3(BJ) dispersion correction and the Hubbard U value over the energies corresponding to the TiO2/Ti2O3 reduction reaction, the oxygen vacancy formation, and transition-metal doping were analyzed to attain an accurate and well-balanced description of these properties. It is suggested to fit the Hubbard correction for the metal dopant atom by taking as reference the observed low spin-high spin (HS) energy difference for the metal atom. PBEsol-D3 calculations revealed a distinct electronic ground state for the yttrium-doped TiO2 anatase surface depending upon the type of doping and interstitial or substitutional defects. Based on the calculations, it was found that a HS state explains the observed ferromagnetism in cobalt-substituted TiO2 anatase. The results presented herein might be relevant for further catalytic studies on TiO2 anatase using a large surface model that would be worthwhile for heterogeneous catalysis simulations.
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Affiliation(s)
- Ana E. Torres
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510 México City, Mexico
| | - Janatan Rodríguez-Pineda
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510 México City, Mexico
| | - Rodolfo Zanella
- Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510 México City, Mexico
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13
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Makkar P, Ghosh NN. A review on the use of DFT for the prediction of the properties of nanomaterials. RSC Adv 2021; 11:27897-27924. [PMID: 35480718 PMCID: PMC9037996 DOI: 10.1039/d1ra04876g] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 08/10/2021] [Indexed: 01/07/2023] Open
Abstract
Nanostructured materials have gained immense attraction because of their extraordinary properties compared to the bulk materials to be used in a plethora of applications in myriad fields. In this review article, we have discussed how the Density Functional Theory (DFT) calculation can be used to explain some of the properties of nanomaterials. With some specific examples here, it has been shown that how closely the different properties of nanomaterials (such as optical, optoelectronics, catalytic and magnetic) predicted by DFT calculations match well with the experimentally determined values. Some examples were discussed in detail to inspire the experimental scientists to conduct DFT-based calculations along with the experiments to derive a better understanding of the experimentally obtained results as well as to predict the properties of the nanomaterial. We have pointed out the challenges associated with DFT, and potential future perspectives of this new exciting field.
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Affiliation(s)
- Priyanka Makkar
- Nano-materials Lab, Department of Chemistry, Birla Institute of Technology and Science, Pilani K K Birla Goa Campus Goa 403726 India +91 832 25570339 +91 832 2580318
| | - Narendra Nath Ghosh
- Nano-materials Lab, Department of Chemistry, Birla Institute of Technology and Science, Pilani K K Birla Goa Campus Goa 403726 India +91 832 25570339 +91 832 2580318
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Chen PC, Gao M, Yu S, Jin J, Song C, Salmeron M, Scott MC, Yang P. Revealing the Phase Separation Behavior of Thermodynamically Immiscible Elements in a Nanoparticle. NANO LETTERS 2021; 21:6684-6689. [PMID: 34283612 DOI: 10.1021/acs.nanolett.1c02225] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Phase-separation is commonly observed in multimetallic nanomaterials, yet it is not well understood how immiscible elements distribute in a thermodynamically stable nanoparticle. Herein, we studied the phase-separation of Au and Rh in nanoparticles using electron microscopy and tomography techniques. The nanoparticles were thermally annealed to form thermodynamically stable structures. HAADF-STEM and EDS characterizations reveal that Au and Rh segregate into two domains while their miscibility is increased. Using aberration-corrected HAADF-STEM and atomic electron tomography, we show that the increased solubility of Au in Rh is achieved by forming Au clusters and single atoms inside the Rh domains and on the Rh surface. Furthermore, based on the three-dimensional reconstruction of a AuRh nanoparticle, we can visualize the uneven interface that is embedded in the nanoparticle. The results advance our understanding on the nanoscale thermodynamic behavior of metal mixtures, which is crucial for the optimization of multimetallic nanostructures for many applications.
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Affiliation(s)
- Peng-Cheng Chen
- Kavli Energy Nanoscience Institute, University of California, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Mengyu Gao
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Sunmoon Yu
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jianbo Jin
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Chengyu Song
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Miquel Salmeron
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Mary C Scott
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Peidong Yang
- Kavli Energy Nanoscience Institute, University of California, Berkeley, California 94720, United States
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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15
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Piccolo L. Restructuring effects of the chemical environment in metal nanocatalysis and single-atom catalysis. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.03.052] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Anderson ID, Riskowski RA, Ackerson CJ. Observable but Not Isolable: The RhAu 24 (PET) 181+ Nanocluster. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2004078. [PMID: 33174675 DOI: 10.1002/smll.202004078] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/09/2020] [Indexed: 06/11/2023]
Abstract
The synthesis and characterization of RhAu24 (PET)18 (PET = 2-phenylethanethiol) is described. The cluster is cosynthesized with Au25 (PET)18 and rhodium thiolates in a coreduction of RhCl3 , HAuCl4 , and PET. Rapid decomposition of RhAu24 (PET)18 occurs when purified from the other reaction products, precluding the study of isolated cluster. Mixtures containing RhAu24 (PET)18 , Au25 (PET)18 , and rhodium thiolates are therefore characterized. Mass spectrometry, X-ray photoelectron spectroscopy, and chromatography methods suggest a combination of charge-charge and metallophilic interactions among Au25 (PET)181- , rhodium thiolates and RhAu24 (PET)18 resulting in stabilization of RhAu24 (PET)18 . The charge of RhAu24 (PET)18 is assigned as 1+ on the basis of its stoichiometric 1:1 presence with anionic Au25 (PET)18 , and its stability is contextualized within the superatom electron counting rules. This analysis concludes that the Rh atom absorbs one superatomic electron to close its d-shell, giving RhAu24 (PET)181+ a superatomic electron configuration of 1S2 1P4 . Overall, an updated framework for rationalizing open d-shell heterometal dopant electronics in thiolated gold nanoclusters emerges.
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Affiliation(s)
- Ian D Anderson
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
| | - Ryan A Riskowski
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
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Weng R, Lu X, Ji N, Fukuoka A, Shrotri A, Li X, Zhang R, Zhang M, Xiong J, Yu Z. Taming the butterfly effect: modulating catalyst nanostructures for better selectivity control of the catalytic hydrogenation of biomass-derived furan platform chemicals. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01708j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
This minireview highlights versatile routes for catalyst nanostructure modulation for better hydrogenation selectivity control of typical biomass-derived furan platform chemicals to tame the butterfly effect on the catalytic selectivity.
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Affiliation(s)
- Rengui Weng
- Indoor Environment Engineering Research Center of Fujian Province, Fujian University of Technology, Fuzhou 350118, P.R. China
| | - Xuebin Lu
- School of Science, Tibet University, Lhasa 850000, P.R. China
| | - Na Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, P.R. China
| | - Atsushi Fukuoka
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Abhijit Shrotri
- Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan
| | - Xiaoyun Li
- School of Agriculture, Sun Yat-sen University, Guangdong 510275, P.R. China
| | - Rui Zhang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, P.R. China
| | - Ming Zhang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, P.R. China
| | - Jian Xiong
- School of Science, Tibet University, Lhasa 850000, P.R. China
| | - Zhihao Yu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, P.R. China
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18
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Combettes S, Lam J, Benzo P, Ponchet A, Casanove MJ, Calvo F, Benoit M. How interface properties control the equilibrium shape of core-shell Fe-Au and Fe-Ag nanoparticles. NANOSCALE 2020; 12:18079-18090. [PMID: 32856658 DOI: 10.1039/d0nr04425c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
While combining two metals in the same nanoparticle can lead to remarkable novel applications, the resulting structure in terms of crystallinity and shape remains difficult to predict. It is thus essential to provide a detailed atomistic picture of the underlying growth processes. In the present work we address the case of core-shell Fe-Au and Fe-Ag nanoparticles. Interface properties between Fe and the noble metals Au and Ag, computed using DFT, were used to parameterize Fe-Au and Fe-Ag pairwise interactions in combination with available many-body potentials for the pure elements. The growth of Au or Ag shells on nanometric Fe cores with prescribed shapes was then modelled by means of Monte Carlo simulations. The shape of the obtained Fe-Au nanoparticles is found to strongly evolve with the amount of metal deposited on the Fe core, a transition from the polyhedral Wulff shape of bare iron to a cubic shape taking place as the amount of deposited gold exceeds two monolayers. In striking contrast, the growth of silver proceeds in a much more anisotropic, Janus-like way and with a lesser dependence on the iron core shape. In both cases, the predicted morphologies are found to be in good agreement with experimental observations in which the nanoparticles are grown by physical deposition methods. Understanding the origin of these differences, which can be traced back to subtle variations in the electronic structure of the Au/Fe and Ag/Fe interfaces, should further contribute to the better design of core-shell bimetallic nanoparticles.
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Affiliation(s)
- Ségolène Combettes
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Julien Lam
- Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, Code Postal 231, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Patrizio Benzo
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Anne Ponchet
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Marie-José Casanove
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Florent Calvo
- Univ. Grenoble Alpes, CNRS, LiPhy, 38000 Grenoble, France
| | - Magali Benoit
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
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19
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Nanoalloying of clusters of immiscible metals and the formation of bimetallic nanoparticles in the conditions of non-synchronous explosion of two wires. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.11.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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20
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Structure and Catalytic Behavior of Alumina Supported Bimetallic Au-Rh Nanoparticles in the Reduction of NO by CO. Catalysts 2019. [DOI: 10.3390/catal9110937] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Alumina-supported bimetallic AuRh catalysts, as well as monometallic reference catalysts, were examined with regard to their structural and catalytic properties in the reduction of NO by CO. Depending on the molar ratio of Au:Rh, the nanoparticles prepared by borohydride co-reduction of corresponding metal salt solutions had a size of 3.5–6.7 nm. The particles consisted of well-dispersed noble metal atoms with some enrichment of Rh in their surface region. NO conversion of AuRh/Al2O3 shifted to lower temperatures with increasing Rh content, reaching highest activity and highest N2 selectivity for the monometallic Rh/Al2O3 catalyst. This behavior is attributed to the enhanced adsorption of CO on the bimetallic catalyst resulting in unfavorable cationic Rh clusters Rh+-(CO)2. Doping with ceria of AuRh/Al2O3 and Rh/Al2O3 catalysts increased the surface population of metallic Rh sites, which are considered most active for the reduction of NO by CO and enhancement of the formation of intermediate isocyanate (-NCO) surface species and their reaction with NO to form N2 and CO2.
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21
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van Deelen TW, Hernández Mejía C, de Jong KP. Control of metal-support interactions in heterogeneous catalysts to enhance activity and selectivity. Nat Catal 2019. [DOI: 10.1038/s41929-019-0364-x] [Citation(s) in RCA: 652] [Impact Index Per Article: 130.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Trindell JA, Duan Z, Henkelman G, Crooks RM. Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory. Chem Rev 2019; 120:814-850. [DOI: 10.1021/acs.chemrev.9b00246] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jamie A. Trindell
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Zhiyao Duan
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Graeme Henkelman
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Richard M. Crooks
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
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23
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Yu J, Li G, Liu H, Li Z, Liu Y. Donut Assembly of Nanoparticles with High Catalytic Efficiency for Hydrogen Gas Generation from Ammonia Borane. ChemCatChem 2019. [DOI: 10.1002/cctc.201901297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jianyi Yu
- School of ChemistryBeihang University, Beijing Beijing 100191 P. R. China
| | - Guangwen Li
- School of ChemistryBeihang University, Beijing Beijing 100191 P. R. China
| | - Haijian Liu
- School of ChemistryBeihang University, Beijing Beijing 100191 P. R. China
| | - Zongzhe Li
- School of ChemistryBeihang University, Beijing Beijing 100191 P. R. China
| | - Yuzhou Liu
- School of ChemistryBeihang University, Beijing Beijing 100191 P. R. China
- Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University Beijing 100191 P. R. China
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24
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Duan Z, Timoshenko J, Kunal P, House SD, Wan H, Jarvis K, Bonifacio C, Yang JC, Crooks RM, Frenkel AI, Humphrey SM, Henkelman G. Structural characterization of heterogeneous RhAu nanoparticles from a microwave-assisted synthesis. NANOSCALE 2018; 10:22520-22532. [PMID: 30480291 DOI: 10.1039/c8nr04866e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A microwave assisted method was used to synthesize RhAu nanoparticles (NPs). Characterization, based upon transmission electron microscopy (TEM), energy dispersive spectroscopy, and powder X-ray diffraction, provided the evidence of monomodal alloy NPs with a mean size distribution between 3 and 5 nm, depending upon the composition. Extended X-ray adsorption fine-structure spectroscopy (EXAFS) also showed evidence of alloying, but the coordination numbers of Rh and Au indicated significant segregation between the metals. More problematic were the low coordination numbers for Rh; values of ca. 9 indicate NPs smaller than 2 nm, significantly smaller than those observed with TEM. Additionally, no single-particle structural models were able to reproduce the experimental EXAFS data. Resolution of this discrepancy was achieved with high resolution aberration corrected scanning TEM imaging which showed the presence of ultra-small (<2 nm) pure Rh clusters and larger (∼3-5 nm) segregated particles with Au-rich cores and Rh-decorated shells. A heterogeneous model with a mixture of ultrasmall pure Rh clusters and larger segregated Rh/Au NPs was able to explain the experimental measurements of the NPs over the range of compositions measured. The combination of density functional theory, EXAFS, and TEM allowed us to quantify the heterogeneity in the RhAu NPs. It was only through this combination of theoretical and experimental techniques that resulted in a bimodal distribution of particle sizes that was able to explain all of the experimental characterization data.
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Affiliation(s)
- Zhiyao Duan
- Department of Chemistry and the Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX 78712-0165, USA
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25
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Palotás K, Óvári L, Vári G, Gubó R, Farkas AP, Kiss J, Berkó A, Kónya Z. Au–Rh Surface Structures on Rh(111): DFT Insights into the Formation of an Ordered Surface Alloy. THE JOURNAL OF PHYSICAL CHEMISTRY C 2018. [DOI: 10.1021/acs.jpcc.8b05744] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krisztián Palotás
- Department of Complex Physical Systems, Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9., SK-84511 Bratislava, Slovakia
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
- Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki út 8., H-1111 Budapest, Hungary
| | - László Óvári
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
- ELI-ALPS, ELI-HU Nonprofit Ltd., Dugonics tér 13., H-6720 Szeged, Hungary
| | - Gábor Vári
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
| | - Richárd Gubó
- ELI-ALPS, ELI-HU Nonprofit Ltd., Dugonics tér 13., H-6720 Szeged, Hungary
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
| | - Arnold P. Farkas
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
- ELI-ALPS, ELI-HU Nonprofit Ltd., Dugonics tér 13., H-6720 Szeged, Hungary
| | - János Kiss
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
| | - András Berkó
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
| | - Zoltán Kónya
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1., H-6720 Szeged, Hungary
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26
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Demiroglu I, Fan TE, Li ZY, Yuan J, Liu TD, Piccolo L, Johnston RL. Modelling free and oxide-supported nanoalloy catalysts: comparison of bulk-immiscible Pd–Ir and Au–Rh systems and influence of a TiO2 support. Faraday Discuss 2018; 208:53-66. [DOI: 10.1039/c7fd00213k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
DFT calculations on free and TiO2-supported Pd–Ir and Au–Rh nanoalloys reveal that Janus and core–shell configurations compete on oxide supports.
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Affiliation(s)
- Ilker Demiroglu
- School of Chemistry
- University of Birmingham
- Birmingham B15 2TT
- UK
- Department of Mechanical Engineering
| | - Tian-E. Fan
- School of Chemistry
- University of Birmingham
- Birmingham B15 2TT
- UK
- Department of Automation
| | - Z. Y. Li
- Nanoscale Physics Research Laboratory
- School of Physics and Astronomy
- University of Birmingham
- Birmingham B15 2TT
- UK
| | - Jun Yuan
- Department of Physics
- University of York
- York
- UK
| | - Tun-Dong Liu
- Department of Automation
- Xiamen University
- Xiamen
- China
| | - Laurent Piccolo
- Univ Lyon
- Université Claude Bernard – Lyon 1
- CNRS
- IRCELYON – UMR 5256
- F-69626 Villeurbanne Cedex
| | - Roy L. Johnston
- School of Chemistry
- University of Birmingham
- Birmingham B15 2TT
- UK
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27
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Gubó R, Vári G, Kiss J, Farkas AP, Palotás K, Óvári L, Berkó A, Kónya Z. Tailoring the hexagonal boron nitride nanomesh on Rh(111) with gold. Phys Chem Chem Phys 2018; 20:15473-15485. [PMID: 29799587 DOI: 10.1039/c8cp00790j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The pore diameter (depth) of the periodically corrugated h-BN monolayer (“nanomesh”) can be tuned allyoing Au into the Rh(111) surface.
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Affiliation(s)
- R. Gubó
- Extreme Light Infrastructure-ALPS
- ELI-HU Non-profit Ltd
- H-6720 Szeged
- Hungary
- Department of Applied and Environmental Chemistry, University of Szeged
| | - G. Vári
- Department of Applied and Environmental Chemistry, University of Szeged
- H-6720 Szeged
- Hungary
| | - J. Kiss
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
- H-6720 Szeged
- Hungary
| | - A. P. Farkas
- Extreme Light Infrastructure-ALPS
- ELI-HU Non-profit Ltd
- H-6720 Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
| | - K. Palotás
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
- H-6720 Szeged
- Hungary
- Institute of Physics
- Slovak Academy of Sciences
| | - L. Óvári
- Extreme Light Infrastructure-ALPS
- ELI-HU Non-profit Ltd
- H-6720 Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
| | - A. Berkó
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
- H-6720 Szeged
- Hungary
| | - Z. Kónya
- Department of Applied and Environmental Chemistry, University of Szeged
- H-6720 Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
- H-6720 Szeged
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28
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Buendía F, Vargas JA, Johnston RL, Beltrán MR. Study of the stability of small AuRh clusters found by a Genetic Algorithm methodology. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.09.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Luo L, Timoshenko J, Lapp AS, Frenkel AI, Crooks RM. Structural Characterization of Rh and RhAu Dendrimer-Encapsulated Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12434-12442. [PMID: 28991487 DOI: 10.1021/acs.langmuir.7b02857] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report the structural characterization of 1-2 nm Rh and RhAu alloy dendrimer-encapsulated nanoparticles (DENs) prepared by chemical reduction with NaBH4. In contrast to previously reported results, in situ and ex situ X-ray absorption spectroscopic experiments indicate that only a fraction of the Rh3+ present in the precursors are reduced by NaBH4. Additional structural analysis of RhAu alloy DENs using extended X-ray absorption fine structure spectroscopy leads to a model in which there is significant segregation of Rh and Au within the nanoparticles. In Rh-rich alloy DENs, Au atoms are segregated on the nanoparticle surface.
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Affiliation(s)
- Long Luo
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Janis Timoshenko
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | - Aliya S Lapp
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University , Stony Brook, New York 11794, United States
| | - Richard M Crooks
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712, United States
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Demiroglu I, Li Z, Piccolo L, Johnston RL. A DFT study of molecular adsorption on titania-supported AuRh nanoalloys. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.02.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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