1
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Routh PK, Liu Y, Marcella N, Kozinsky B, Frenkel AI. Latent Representation Learning for Structural Characterization of Catalysts. J Phys Chem Lett 2021; 12:2086-2094. [PMID: 33620230 DOI: 10.1021/acs.jpclett.0c03792] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Supervised machine learning-enabled mapping of the X-ray absorption near edge structure (XANES) spectra to local structural descriptors offers new methods for understanding the structure and function of working nanocatalysts. We briefly summarize a status of XANES analysis approaches by supervised machine learning methods. We present an example of an autoencoder-based, unsupervised machine learning approach for latent representation learning of XANES spectra. This new approach produces a lower-dimensional latent representation, which retains a spectrum-structure relationship that can be eventually mapped to physicochemical properties. The latent space of the autoencoder also provides a pathway to interpret the information content "hidden" in the X-ray absorption coefficient. Our approach (that we named latent space analysis of spectra, or LSAS) is demonstrated for the supported Pd nanoparticle catalyst studied during the formation of Pd hydride. By employing the low-dimensional representation of Pd K-edge XANES, the LSAS method was able to isolate the key factors responsible for the observed spectral changes.
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Affiliation(s)
- Prahlad K Routh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Yang Liu
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Nicholas Marcella
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Boris Kozinsky
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Bosch Research, Cambridge, Massachusetts 02139, United States
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
- Division of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, United States
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2
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Zhang H, Wang X, Frenkel AI, Liu P. Rationalization of promoted reverse water gas shift reaction by Pt 3Ni alloy: Essential contribution from ensemble effect. J Chem Phys 2021; 154:014702. [PMID: 33412872 DOI: 10.1063/5.0037886] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Bimetallic alloys have attracted considerable attention due to the tunable catalytic activity and selectivity that can be different from those of pure metals. Here, we study the superior catalytic behaviors of the Pt3Ni nanowire (NW) over each individual, Pt and Ni NWs during the reverse Water Gas Shift (rWGS) reaction, using density functional theory. The results show that the promoted rWGS activity by Pt3Ni strongly depends on the ensemble effect (a particular arrangement of active sites introduced by alloying), while the contributions from ligand and strain effects, which are of great importance in electrocatalysis, are rather subtle. As a result, a unique Ni-Pt hybrid ensemble is observed at the 110/111 edge of the Pt3Ni NW, where the synergy between Ni and Pt sites is active enough to stabilize carbon dioxide on the surface readily for the rWGS reaction but moderate enough to allow for the facile removal of carbon monoxide and hydrogenation of hydroxyl species. Our study highlights the importance of the ensemble effect in heterogeneous catalysis of metal alloys, enabling selective binding-tuning and promotion of catalytic activity.
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Affiliation(s)
- Hong Zhang
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
| | - Xuelong Wang
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Anatoly I Frenkel
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Ping Liu
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
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3
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Duan Z, Henkelman G. Surface Charge and Electrostatic Spin Crossover Effects in CoN 4 Electrocatalysts. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02458] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Zhiyao Duan
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, United States
| | - Graeme Henkelman
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, United States
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4
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Zhang S, Johnson DD, Shelton WA, Xu Y. Hydrogen Adsorption on Ordered and Disordered Pt-Ni Alloys. Top Catal 2020. [DOI: 10.1007/s11244-020-01338-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Lapp AS, Duan Z, Henkelman G, Crooks RM. Combined Experimental and Theoretical Study of the Structure of AuPt Nanoparticles Prepared by Galvanic Exchange. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16496-16507. [PMID: 31804090 DOI: 10.1021/acs.langmuir.9b03192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this article, experiment and theory are combined to analyze Pb and Cu underpotential deposition (UPD) on ∼1.7 nm Au nanoparticles (NPs) and the AuPt structures that result after galvanic exchange (GE) of the UPD layer for Pt. Experimental Pb (0.49 ML) and Pt (0.50 ML) coverages are close to values predicted by density functional theory-molecular dynamics (DFT-MD, 0.59 ML). DFT-MD reveals that the AuNPs spontaneously reconstruct from cuboctahedral to a (111)-like structure prior to UPD. In the case of Pb, this results in the random electrodeposition of Pb onto the Au surface. This mechanism is a consequence of opposing trends in Pb-Pb and Pb-Au coordination numbers as a function of Pb coverage. Cu UPD is more complex, and agreement between theory and experiment takes into account ligand effects (e.g., SO42- present as the electrolyte) and the electric double layer. Importantly, AuPt structures formed upon Pt GE are found to differ markedly depending on the UPD metal. Specifically, cyclic voltammetry indicates that the Pt coverage is ∼0.20 ML greater for Cu UPD/Pt GE (0.70 ML) than for Pb UPD/Pt GE (0.50 ML). This difference is corroborated by DFT-MD theoretical predictions. Finally, DFT-MD calculations predict the formation of surface alloy and core@shell structures for Pb UPD/Pt GE and Cu UPD/Pt GE, respectively.
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6
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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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7
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Li H, Guo S, Shin K, Wong MS, Henkelman G. Design of a Pd–Au Nitrite Reduction Catalyst by Identifying and Optimizing Active Ensembles. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02182] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hao Li
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Sujin Guo
- Department of Civil and Environmental Engineering, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Department of Chemical and Biomolecular Engineering, Department of Chemistry, and Department of Materials Science and Nano Engineering, Rice University, 6100 South Main Street, Houston, Texas 77005, United States
| | - Kihyun Shin
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
| | - Michael S. Wong
- Department of Civil and Environmental Engineering, Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Department of Chemical and Biomolecular Engineering, Department of Chemistry, and Department of Materials Science and Nano Engineering, Rice University, 6100 South Main Street, Houston, Texas 77005, United States
| | - Graeme Henkelman
- Department of Chemistry and the Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712, United States
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8
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Timoshenko J, Duan Z, Henkelman G, Crooks RM, Frenkel AI. Solving the Structure and Dynamics of Metal Nanoparticles by Combining X-Ray Absorption Fine Structure Spectroscopy and Atomistic Structure Simulations. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2019; 12:501-522. [PMID: 30699037 DOI: 10.1146/annurev-anchem-061318-114929] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Extended X-ray absorption fine structure (EXAFS) spectroscopy is a premiere method for analysis of the structure and structural transformation of nanoparticles. Extraction of analytical information about the three-dimensional structure and dynamics of metal-metal bonds from EXAFS spectra requires special care due to their markedly non-bulk-like character. In recent decades, significant progress has been made in the first-principles modeling of structure and properties of nanoparticles. In this review, we summarize new approaches for EXAFS data analysis that incorporate particle structure modeling into the process of structural refinement.
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Affiliation(s)
- J Timoshenko
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA;
| | - Z Duan
- Department of Chemistry and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA
- Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas 78712, USA
| | - G Henkelman
- Department of Chemistry and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA
- Institute for Computational and Engineering Sciences, University of Texas at Austin, Austin, Texas 78712, USA
| | - R M Crooks
- Department of Chemistry and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA
| | - A I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA;
- Division of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA
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9
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Zhou Z, Yuan Z, Li S, Li H, Chen J, Wang Y, Huang Q, Wang C, Karahan HE, Henkelman G, Liao X, Wei L, Chen Y. Big to Small: Ultrafine Mo 2 C Particles Derived from Giant Polyoxomolybdate Clusters for Hydrogen Evolution Reaction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1900358. [PMID: 30735307 DOI: 10.1002/smll.201900358] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Indexed: 06/09/2023]
Abstract
Due to its electronic structure, similar to platinum, molybdenum carbides (Mo2 C) hold great promise as a cost-effective catalyst platform. However, the realization of high-performance Mo2 C catalysts is still limited because controlling their particle size and catalytic activity is challenging with current synthesis methods. Here, the synthesis of ultrafine β-Mo2 C nanoparticles with narrow size distribution (2.5 ± 0.7 nm) and high mass loading (up to 27.5 wt%) on graphene substrate using a giant Mo-based polyoxomolybdate cluster, Mo132 ((NH4 )42 [Mo132 O372 (CH3 COO)30 (H2 O)72 ]·10CH3 COONH4 ·300H2 O) is demonstrated. Moreover, a nitrogen-containing polymeric binder (polyethyleneimine) is used to create MoN bonds between Mo2 C nanoparticles and nitrogen-doped graphene layers, which significantly enhance the catalytic activity of Mo2 C for the hydrogen evolution reaction, as is revealed by X-ray photoelectron spectroscopy and density functional theory calculations. The optimal Mo2 C catalyst shows a large exchange current density of 1.19 mA cm-2 , a high turnover frequency of 0.70 s-1 as well as excellent durability. The demonstrated new strategy opens up the possibility of developing practical platinum substitutes based on Mo2 C for various catalytic applications.
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Affiliation(s)
- Zheng Zhou
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Ziwen Yuan
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Sai Li
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Hao Li
- Department of Chemistry and the Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 E. 24th Street, Stop A5300, Austin, TX, 78712, USA
| | - Junsheng Chen
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Yanqing Wang
- Faculty of Engineering, The University of Tokyo, Yayoi, Bunkyo-Ku, Tokyo, 113-00, Japan
| | - Qianwei Huang
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Cheng Wang
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Huseyin Enis Karahan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
| | - Graeme Henkelman
- Department of Chemistry and the Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 E. 24th Street, Stop A5300, Austin, TX, 78712, USA
| | - Xiaozhou Liao
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Li Wei
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Yuan Chen
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, 2006, Australia
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10
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Yun J, Zhu C, Wang Q, Hu Q, Yang G. Catalytic conversions of atmospheric sulfur dioxide and formation of acid rain over mineral dusts: Molecular oxygen as the oxygen source. CHEMOSPHERE 2019; 217:18-25. [PMID: 30396046 DOI: 10.1016/j.chemosphere.2018.10.201] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 10/26/2018] [Accepted: 10/29/2018] [Indexed: 06/08/2023]
Abstract
Sulfur dioxide (SO2) ranks as a major air pollutant and is likely to generate acid rain. When molecular oxygen is the oxygen source, the regular surfaces of gibbsite (one of the most abundant mineral dusts) show no reactivity for SO2 conversions to H2SO4, while the partially dehydrated (100) surface with coordination-unsaturated Al sites becomes catalytically effective. Because of the easy availability of molecular oxygen, results manifest that acid rain can form under all atmospheric conditions and may account for the high conversion ratio of atmospheric SO2. The (100) and (001) surfaces show divergent catalytic effects, and hydrolysis is always the rate-limiting step. Path A (hydrolysis and then oxidation) is preferred for (100) surface, whereas a third path with obviously lower activation barriers is presented for (001) surface, which is non-existent for (100) surface. Atomic oxygen originating from the dissociation of molecular oxygen is catalytically active for (100) surface, while the active site of (001) surface fails to be recovered, suggesting that SO2 conversions over gibbsite surfaces are facet-controlled. This work also offers an environmentally friendly route for production of H2SO4 (one of the essential compounds in chemical industry), directly using molecular oxygen as the oxygen source.
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Affiliation(s)
- Jiena Yun
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Chang Zhu
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Qian Wang
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Qiaoli Hu
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China
| | - Gang Yang
- College of Resources and Environment & Chongqing Key Laboratory of Soil Multi-scale Interfacial Process, Southwest University, Chongqing 400715, China.
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11
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Xu H, Cheng D, Gao Y, Zeng XC. Assessment of Catalytic Activities of Gold Nanoclusters with Simple Structure Descriptors. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02423] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Haoxiang Xu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic−Inorganic Composites, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Daojian Cheng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic−Inorganic Composites, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Yi Gao
- Division of Interfacial Water and Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy
of Sciences, Shanghai 201800, People’s Republic of China
| | - Xiao Cheng Zeng
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Organic−Inorganic Composites, Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
- Department of Chemistry and Department Biomolecular & Chemical Engineering, University of Nebraska, Lincoln, Nebraska 68588, United States
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12
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Shuttleworth IG. Binding Site Transitions Across Strained Oxygenated and Hydroxylated Pt(111). Chemistry 2018; 7:356-369. [PMID: 29872611 PMCID: PMC5974552 DOI: 10.1002/open.201800039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Indexed: 12/02/2022]
Abstract
The effects of strain σ on the binding position preference of oxygen atoms and hydroxyl groups adsorbed on Pt(111) have been investigated using density functional theory. A transition between the bridge and FCC binding occurs under compressive strain of the O/Pt(111) surface. A significant reconstruction occurs under compressive strain of the OH/Pt(111) surface, and the surface OH groups preferentially occupy on‐top (bridge) positions at highly compressive (less compressive/tensile) strains. Changes to magnetisation of the O‐ and OH‐populated surfaces are discussed and for O/Pt(111) oxygenation reduces the surface magnetism via a delocalised mechanism. The origins of the surface magnetisation for both O‐ and OH‐bearing systems are discussed in terms of the state‐resolved electronic populations and of the surface charge density.
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Affiliation(s)
- Ian G Shuttleworth
- School of Science and Technology Nottingham Trent University Nottingham NG11 8NS UK
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13
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Li J, Li L, Wang MJ, Wang J, Wei Z. Alloys with Pt-skin or Pt-rich surface for electrocatalysis. Curr Opin Chem Eng 2018. [DOI: 10.1016/j.coche.2018.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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14
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Flores-Rojas E, Cruz-Martínez H, Rojas-Chávez H, Tellez-Cruz MM, Reyes-Rodríguez JL, Cabañas-Moreno JG, Calaminici P, Solorza-Feria O. A Combined DFT and Experimental Investigation of Pt-Wrapped CoNi Nanoparticles for the Oxygen Reduction Reaction. Electrocatalysis (N Y) 2018. [DOI: 10.1007/s12678-018-0474-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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An H, Ha H, Yoo M, Kim HY. Understanding the atomic-level process of CO-adsorption-driven surface segregation of Pd in (AuPd) 147 bimetallic nanoparticles. NANOSCALE 2017; 9:12077-12086. [PMID: 28799609 DOI: 10.1039/c7nr04435f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
When the elements that compose bimetallic catalysts interact asymmetrically with reaction feedstock, the surface concentration of the bimetallic catalysts and the morphology of the reaction center evolve dynamically as a function of environmental factors such as the partial pressure of the triggering molecule. Relevant experimental and theoretical findings of the dynamic structural evolution of bimetallic catalysts under the reaction conditions are emerging, thus enabling the design of more consistent, reliable, and efficient bimetallic catalysts. In an initial attempt to provide an atomic-level understanding of the adsorption-induced structural evolution of bimetallic nanoparticles (NPs) under CO oxidation conditions, we used density functional theory to study the details of CO-adsorption-driven Pd surface segregation in (AuPd)147 bimetallic NPs. The strong CO affinity of Pd provides a driving force for Pd surface segregation. We found that the vertex site of the NP becomes a gateway for the initial Pd-Au swapping and the subsequent formation of an internal vacancy. This self-generated internal vacancy easily diffuses inside the NP and activates Pd-Au swapping pathways in the (100) NP facet. Our results reveal how the surface and internal concentrations of bimetallic NPs respond immediately to changes in the reaction conditions. Our findings should aid in the rational design of highly active and versatile bimetallic catalysts by considering the environmental factors that systematically affect the structure of bimetallic catalysts under the reaction conditions.
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Affiliation(s)
- Hyesung An
- Department of Materials Science and Engineering, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea.
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16
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Timoshenko J, Keller KR, Frenkel AI. Determination of bimetallic architectures in nanometer-scale catalysts by combining molecular dynamics simulations with x-ray absorption spectroscopy. J Chem Phys 2017; 146:114201. [DOI: 10.1063/1.4978500] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Janis Timoshenko
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA
| | - Kayla R. Keller
- Mathematics Department, Bowdoin College, Brunswick, Maine 04011, USA
| | - Anatoly I. Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA
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17
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Xu H, Xu CQ, Cheng D, Li J. Identification of activity trends for CO oxidation on supported transition-metal single-atom catalysts. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00464h] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Identification of activity trends for CO oxidation on transition-metal single-atom catalysts by using Ead(CO) and Ead(O2) as descriptors.
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Affiliation(s)
- Haoxiang Xu
- Beijing Key Laboratory of Energy Environmental Catalysis
- State Key Laboratory of Organic-Inorganic Composites
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Cong-Qiao Xu
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education
- Tsinghua University
- Beijing 100084
- China
| | - Daojian Cheng
- Beijing Key Laboratory of Energy Environmental Catalysis
- State Key Laboratory of Organic-Inorganic Composites
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Jun Li
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education
- Tsinghua University
- Beijing 100084
- China
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18
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Corona B, Howard M, Zhang L, Henkelman G. Computational screening of core@shell nanoparticles for the hydrogen evolution and oxygen reduction reactions. J Chem Phys 2016; 145:244708. [DOI: 10.1063/1.4972579] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Benjamin Corona
- Department of Chemistry and the Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, USA
| | - Marco Howard
- Department of Chemistry and the Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, USA
| | - Liang Zhang
- Department of Chemistry and the Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, USA
| | - Graeme Henkelman
- Department of Chemistry and the Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712-0165, USA
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19
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Czelej K, Cwieka K, Colmenares JC, Kurzydlowski KJ. Insight on the Interaction of Methanol-Selective Oxidation Intermediates with Au- or/and Pd-Containing Monometallic and Bimetallic Core@Shell Catalysts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7493-7502. [PMID: 27373791 DOI: 10.1021/acs.langmuir.6b01906] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Using density functional theory (DFT), the interaction of crucial molecules involved in the selective partial oxidation of methanol to methyl formate (MF) with monometallic Au and Pd and bimetallic Au/Pd and Pd/Au core@shell catalysts is systematically investigated. The core@shell structures modeled in this study consist of Au(111) and Pd(111) cores covered by a monolayer of Pd and Au, respectively. Our results indicate that the adsorption strength of the molecules examined as a function of catalytic surface decreases in the order of Au/Pd(111) > Pd(111) > Au(111) > Pd/Au(111) and correlates well with the d-band center model. The preadsorption of oxygen is found to have a positive impact on the selective partial oxidation reaction because of the stabilization of CH3OH and HCHO on the catalyst surface and the simultaneous intensification of MF desorption. On the basis of a dynamical matrix approach combined with statistical thermodynamics, we propose a simple route for evaluating the Gibbs free energy of adsorption as a function of temperature. This method allows us to anticipate the relative temperature stability of molecules involved in the selective partial oxidation of methanol to MF in terms of catalytic surface.
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Affiliation(s)
- Kamil Czelej
- Faculty of Materials Science and Engineering, Warsaw University of Technology , 141Woloska Street, 02-507 Warsaw, Poland
| | - Karol Cwieka
- Faculty of Materials Science and Engineering, Warsaw University of Technology , 141Woloska Street, 02-507 Warsaw, Poland
| | - Juan Carlos Colmenares
- Institute of Physical Chemistry, Polish Academy of Sciences , 44/52 Kasprzaka Street, 01-224 Warsaw, Poland
| | - Krzysztof J Kurzydlowski
- Faculty of Materials Science and Engineering, Warsaw University of Technology , 141Woloska Street, 02-507 Warsaw, Poland
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Ruditskiy A, Peng HC, Xia Y. Shape-Controlled Metal Nanocrystals for Heterogeneous Catalysis. Annu Rev Chem Biomol Eng 2016; 7:327-48. [DOI: 10.1146/annurev-chembioeng-080615-034503] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aleksey Ruditskiy
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332;
| | - Hsin-Chieh Peng
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332;
| | - Younan Xia
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332;
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
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21
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Jennings PC, Lysgaard S, Hansen HA, Vegge T. Decoupling strain and ligand effects in ternary nanoparticles for improved ORR electrocatalysis. Phys Chem Chem Phys 2016; 18:24737-45. [DOI: 10.1039/c6cp04194a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Ternary Pt–Au–M (M = 3d transition metal) nanoparticles show reduced OH adsorption energies and improved activity for the oxygen reduction reaction (ORR) compared to pure Pt nanoparticles, as obtained by density functional theory.
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Affiliation(s)
- Paul C. Jennings
- Department of Energy Conversion and Storage
- Technical University of Denmark
- Lyngby
- Denmark
| | - Steen Lysgaard
- Department of Energy Conversion and Storage
- Technical University of Denmark
- Lyngby
- Denmark
| | - Heine A. Hansen
- Department of Energy Conversion and Storage
- Technical University of Denmark
- Lyngby
- Denmark
| | - Tejs Vegge
- Department of Energy Conversion and Storage
- Technical University of Denmark
- Lyngby
- Denmark
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22
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Luo L, Zhang L, Henkelman G, Crooks RM. Unusual Activity Trend for CO Oxidation on Pd(x)Au(140-x)@Pt Core@Shell Nanoparticle Electrocatalysts. J Phys Chem Lett 2015; 6:2562-2568. [PMID: 26266734 DOI: 10.1021/acs.jpclett.5b00985] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A theoretical and experimental study of the electrocatalytic oxidation of CO on PdxAu140-x@Pt dendrimer-encapsulated nanoparticle (DEN) catalysts is presented. These nanoparticles are comprised of a core having an average of 140 atoms and a Pt monolayer shell. The CO oxidation activity trend exhibits an unusual koppa shape as the number of Pd atoms in the core is varied from 0 to 140. Calculations based on density functional theory suggest that the koppa-shaped trend is driven primarily by structural changes that affect the CO binding energy on the surface. Specifically, a pure Au core leads to deformation of the Pt shell and a compression of the Pt lattice. In contrast, Pd, from the pure Pd cores, tends to segregate on the DEN surface, forming an inverted configuration having Pt within the core and Pd in the shell. With a small addition of Au, however, the alloy PdAu cores stabilize the core@shell structures by preventing Au and Pd from escaping to the particle surface.
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Affiliation(s)
- Long Luo
- †Department of Chemistry, ‡Texas Materials Institute, and §Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Liang Zhang
- †Department of Chemistry, ‡Texas Materials Institute, and §Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Graeme Henkelman
- †Department of Chemistry, ‡Texas Materials Institute, and §Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Richard M Crooks
- †Department of Chemistry, ‡Texas Materials Institute, and §Institute for Computational and Engineering Sciences, The University of Texas at Austin, 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
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