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Han T, Li Y, Cao Y, Lee I, Zhou X, Frenkel AI, Zaera F. In situ identification of surface sites in Cu-Pt bimetallic catalysts: Gas-induced metal segregation. J Chem Phys 2022; 157:234706. [PMID: 36550054 DOI: 10.1063/5.0130431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The effect of gases on the surface composition of Cu-Pt bimetallic catalysts has been tested by in situ infrared (IR) and x-ray absorption spectroscopies. Diffusion of Pt atoms within the Cu-Pt nanoparticles was observed both in vacuum and under gaseous atmospheres. Vacuum IR spectra of CO adsorbed on CuPtx/SBA-15 catalysts (x = 0-∞) at 125 K showed no bonding on Pt regardless of Pt content, but reversible Pt segregation to the surface was seen with the high-Pt-content (x ≥ 0.2) samples upon heating to 225 K. In situ IR spectra in CO atmospheres also highlighted the reversible segregation of Pt to the surface and its diffusion back into the bulk when cycling the temperature from 295 to 495 K and back, most evidently for diluted single-atom alloy catalysts (x ≤ 0.01). Similar behavior was possibly observed under H2 using small amounts of CO as a probe molecule. In situ x-ray absorption near-edge structure data obtained for CuPt0.2/SBA-15 under both CO and He pointed to the metallic nature of the Pt atoms irrespective of gas or temperature, but analysis of the extended x-ray absorption fine structure identified a change in coordination environment around the Pt atoms, from a (Pt-Cu):(Pt-Pt) coordination number ratio of ∼6:6 at or below 445 K to 8:4 at 495 K. The main conclusion is that Cu-Pt bimetallic catalysts are dynamic, with the composition of their surfaces being dependent on temperature in gaseous environments.
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Affiliation(s)
- Tongxin Han
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, USA
| | - Yuanyuan Li
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA
| | - Yueqiang Cao
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Ilkeun Lee
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, USA
| | - Xinggui Zhou
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, USA
| | - Francisco Zaera
- Department of Chemistry and UCR Center for Catalysis, University of California, Riverside, California 92521, USA
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2
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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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3
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Huang K, Crooks RM. Enhanced electrocatalytic activity of Cu-modified, high-index single Pt NPs for formic acid oxidation. Chem Sci 2022; 13:12479-12490. [PMID: 36349269 PMCID: PMC9628932 DOI: 10.1039/d2sc03433f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 10/10/2022] [Indexed: 11/28/2022] Open
Abstract
A key goal of nanoparticle-based catalysis research is to correlate the structure of nanoparticles (NPs) to their catalytic function. The most common approach for achieving this goal is to synthesize ensembles of NPs, characterize the ensemble, and then evaluate its catalytic properties. This approach is effective, but it excludes the certainty of structural heterogeneity in the NP ensemble. One means of addressing this shortcoming is to carry out analyses on individual NPs. This approach makes it possible to establish direct correlations between structures of single NPs and, in the case reported here, their electrocatalytic properties. Accordingly, we report on enhanced electrocatalytic formic acid oxidation (FAO) activity using individual Cu-modified, high-indexed Pt NPs. The results show that the Cu-modified Pt NPs exhibit significantly higher currents for FAO than the Pt-only analogs. The increased activity is enabled by the Cu submonolayer on the highly stepped Pt surface, which enhances the direct FAO pathway but not the indirect pathway which proceeds via surface-absorbed CO*. Single-crystal Pt nanoparticles with a diameter of ∼200 nm were electrosynthesized, covered with a single monolayer of Cu, and then fully characterized. The resulting materials exhibit excellent electrocatalytic properties for formic acid oxidation.![]()
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Affiliation(s)
- Ke Huang
- Department of Chemistry, Texas Materials Institute, The University of Texas at Austin, 100 E. 24th St., Stop A1590, Austin, Texas, 78712, USA
| | - Richard M. Crooks
- Department of Chemistry, Texas Materials Institute, The University of Texas at Austin, 100 E. 24th St., Stop A1590, Austin, Texas, 78712, USA
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4
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Acharya A, Dubbu S, Kumar S, Kumari N, Kim Y, So S, Kwon T, Wang Z, Park J, Cho YK, Rho J, Oh SH, Kumar A, Lee IS. Atomically Conformal Metal Laminations on Plasmonic Nanocrystals for Efficient Catalysis. J Am Chem Soc 2021; 143:10582-10589. [PMID: 34213897 DOI: 10.1021/jacs.1c05753] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the enormous application potential, methods for conformal few-atomic-layer deposition on colloidal nanocrystals (NCs) are scarce. Similar to the process of lamination, we introduce a "confine and shine" strategy to homogeneously modify the different surface curvatures of plasmonic NCs with ultrathin conformal layers of diverse catalytic noble metals. This self-limited epitaxial skinlike metal growth harvests the localized surface plasmon resonance to induce reduction chemistry directly on the NC surface, confined inside hollow silica. This strategy avoids any kinetic anisotropic metal deposition. Unlike the conventional thick, anisotropic, and dendritic shells, which show severe nonradiative damping, the skinlike metal lamination preserves the key plasmonic properties of the core NCs. Consequently, the plasmonic-catalytic hybrid nanoreactors can carry out a variety of organic reactions with impressive rates.
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Affiliation(s)
- Anubhab Acharya
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Sateesh Dubbu
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Sumit Kumar
- Center for Soft and Living Matter, Institute for Basic Science (IBS), and Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Nitee Kumari
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Yeseul Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Sunae So
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Taewan Kwon
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Zhipeng Wang
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Korea
| | - Junbeom Park
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Yoon-Kyoung Cho
- Center for Soft and Living Matter, Institute for Basic Science (IBS), and Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
| | - Junsuk Rho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.,Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Sang Ho Oh
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Korea
| | - Amit Kumar
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - In Su Lee
- Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.,Institute for Convergence Research and Education in Advanced Technology (I-CREATE), Yonsei University, Seoul 03722, Korea
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5
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Zhang T, Walsh AG, Yu J, Zhang P. Single-atom alloy catalysts: structural analysis, electronic properties and catalytic activities. Chem Soc Rev 2020; 50:569-588. [PMID: 33170202 DOI: 10.1039/d0cs00844c] [Citation(s) in RCA: 118] [Impact Index Per Article: 29.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Monometallic catalysts, in particular those containing noble metals, are frequently used in heterogeneous catalysis, but they are expensive, rare and the ability to tailor their structures and properties remains limited. Traditionally, alloy catalysts have been used instead that feature enhanced electronic and chemical properties at a reduced cost. Furthermore, the introduction of single metal atoms anchored onto supports provided another effective strategy to increase both the atomic efficiency and the chance of tailoring the properties. Most recently, single-atom alloy catalysts have been developed in which one metal is atomically dispersed throughout the catalyst via alloy bonding; such catalysts combine the traditional advantages of alloy catalysts with the new feature of tailoring properties achievable with single atom catalysts. This review will first outline the atomic scale structural analysis on single-atom alloys using microscopy and spectroscopy tools, such as high-angle annular dark field imaging-scanning transmission electron microscopy and extended X-ray absorption fine structure spectroscopy. Next, progress in research to understand the electronic properties of single-atom alloys using X-ray spectroscopy techniques and quantum calculations will be presented. The catalytic activities of single-atom alloys in a few representative reactions will be further discussed to demonstrate their structure-property relationships. Finally, future perspectives for single-atom alloy catalysts from the structural, electronic and reactivity aspects will be proposed.
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Affiliation(s)
- Tianjun Zhang
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, B3H 4R2, Halifax, Canada.
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7
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Lapp AS, Crooks RM. Multilayer electrodeposition of Pt onto 1-2 nm Au nanoparticles using a hydride-termination approach. NANOSCALE 2020; 12:11026-11039. [PMID: 32420580 DOI: 10.1039/d0nr02929g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Here we report on hydride-terminated (HT) electrodeposition of Pt multilayers onto ∼1.6 nm Au nanoparticles (NPs). The results build on our earlier findings regarding electrodeposition of a single monolayer of Pt onto Au NPs and reports relating to HT Pt electrodeposition onto bulk Au. In the latter case, it was found that electrodeposition of Pt from a solution containing PtCl42- can be limited to a single monolayer of Pt atoms if it is immediately followed by adsorption of a monolayer of H atoms. The H-atom capping layer prevents deposition of Pt multilayers. In the present report we are interested in comparing the structure of NPs after multiple HT Pt electrodeposition cycles to the bulk analog. The results indicate that a greater number of HT Pt cycles are required to electrodeposit both a single Pt monolayer and Pt multilayers onto these Au NPs compared to bulk Au. Additionally, detailed structural analysis shows that there are fundamental differences in the structures of the AuPt materials depending on whether they are prepared on Au NPs or bulk Au. The resulting structures have a profound impact on formic acid oxidation electrocatalysis.
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Affiliation(s)
- Aliya S Lapp
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 2506 Speedway, Stop A5300, Austin, TX 78712-1224, USA.
| | - Richard M Crooks
- Department of Chemistry and Texas Materials Institute, The University of Texas at Austin, 2506 Speedway, Stop A5300, Austin, TX 78712-1224, USA.
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8
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Zhang J, Yu Y, Zhang B. Synthesis and characterization of size controlled alloy nanoparticles. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2018-0046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Bimetallic and multimetallic alloy nanoparticles are emerging as a class of critical nanomaterials in electronic, optical and magnetic fields due to their unique physic-chemical properties. In particular, precise control of the nanoparticle size can endow them with broad versatility and high selectivity. This chapter reviews some tremendous achievements in the development of size controlled bimetallic and multimetallic alloy nanoparticles, with special emphasis on general preparation methods, characterization methodologies and instrumentation techniques. Some key factors and future perspectives on the development of size-controlled bimetallic and multimetallic alloy nanoparticles are also discussed.
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9
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Precise Synthesis of Nanoparticles and Their Catalytic Behavior. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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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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11
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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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12
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Yamamoto K, Imaoka T, Tanabe M, Kambe T. New Horizon of Nanoparticle and Cluster Catalysis with Dendrimers. Chem Rev 2019; 120:1397-1437. [DOI: 10.1021/acs.chemrev.9b00188] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Kimihisa Yamamoto
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Takane Imaoka
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
- PRESTO-JST, Kawaguchi 332-0012, Japan
| | - Makoto Tanabe
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
| | - Tetsuya Kambe
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research (IIR), Tokyo Institute of Technology, Yokohama 226-8503, Japan
- ERATO-JST Yamamoto Atom Hybrid Project, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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14
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Lapp AS, Duan Z, Marcella N, Luo L, Genc A, Ringnalda J, Frenkel AI, Henkelman G, Crooks RM. Experimental and Theoretical Structural Investigation of AuPt Nanoparticles Synthesized Using a Direct Electrochemical Method. J Am Chem Soc 2018; 140:6249-6259. [DOI: 10.1021/jacs.7b12306] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Nicholas Marcella
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | | | - Arda Genc
- Thermo Fisher Scientific, 5350 NE Dawson Creek Drive, Hillsboro, Oregon 97124, United States
| | - Jan Ringnalda
- Thermo Fisher Scientific, 5350 NE Dawson Creek Drive, Hillsboro, Oregon 97124, United States
| | - Anatoly I. Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
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15
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Brust M, Ramírez SA, Gordillo GJ. Site‐Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms. ChemElectroChem 2018. [DOI: 10.1002/celc.201800282] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mathias Brust
- Department of ChemistryUniversity of Liverpool Crown Street Liverpool L69 7ZD United Kingdom
| | - Silvana A. Ramírez
- Area Química, Instituto de CienciasUniversidad Nacional de General Sarmiento J.M. Gutierrez 1150(1613) Los Polvorines, Buenos Aires Argentina
| | - Gabriel J. Gordillo
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, INQUIMAE (CONICET)Universidad de Buenos Aires
- Ciudad Universitaria Pabellón 2 (1428) Buenos Aires Argentina
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16
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Luo L, Duan Z, Li H, Kim J, Henkelman G, Crooks RM. Tunability of the Adsorbate Binding on Bimetallic Alloy Nanoparticles for the Optimization of Catalytic Hydrogenation. J Am Chem Soc 2017; 139:5538-5546. [DOI: 10.1021/jacs.7b01653] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
| | | | | | - Joohoon Kim
- Department
of Chemistry, KHU-KIST Department of Converging Science and Technology,
Research Institute for Basic Sciences, Kyung Hee University, Seoul, South Korea
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17
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Highly efficient silica coated CuNi bimetallic nanocatalyst from reverse microemulsion. J Colloid Interface Sci 2017; 491:123-132. [DOI: 10.1016/j.jcis.2016.12.043] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 11/03/2016] [Accepted: 12/17/2016] [Indexed: 11/19/2022]
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18
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Luo L, Zhang L, Duan Z, Lapp AS, Henkelman G, Crooks RM. Efficient CO Oxidation Using Dendrimer-Encapsulated Pt Nanoparticles Activated with <2% Cu Surface Atoms. ACS NANO 2016; 10:8760-8769. [PMID: 27585091 DOI: 10.1021/acsnano.6b04448] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this paper, we show that the onset potential for CO oxidation electrocatalyzed by ∼2 nm dendrimer-encapsulated Pt nanoparticles (Pt DENs) is shifted negative by ∼300 mV in the presence of a small percentage (<2%) of Cu surface atoms. Theory and experiments suggest that the catalytic enhancement arises from a cocatalytic Langmuir-Hinshelwood mechanism in which the small number of Cu atoms selectively adsorb OH, thereby facilitating reaction with CO adsorbed to the dominant Pt surface. Theory suggests that these Cu atoms are present primarily on the (100) facets of the Pt DENs.
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Affiliation(s)
- Long Luo
- Department of Chemistry, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Liang Zhang
- Department of Chemistry, ‡Institute for Computational and Engineering Sciences, 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, ‡Institute for Computational and Engineering Sciences, and §Texas Materials Institute, The University of Texas at Austin , 105 East 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
| | - Aliya S Lapp
- Department of Chemistry, ‡Institute for Computational and Engineering Sciences, 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, ‡Institute for Computational and Engineering Sciences, 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, ‡Institute for Computational and Engineering Sciences, 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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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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Underpotential Deposition and Related Phenomena at the Nanoscale: Theory and Applications. UNDERPOTENTIAL DEPOSITION 2016. [DOI: 10.1007/978-3-319-24394-8_6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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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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22
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Zhang L, Henkelman G. Computational Design of Alloy-Core@Shell Metal Nanoparticle Catalysts. ACS Catal 2014. [DOI: 10.1021/cs501176b] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Liang Zhang
- Department of Chemistry and
the Institute for Computational Engineering and Sciences, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, United States
| | - Graeme Henkelman
- Department of Chemistry and
the Institute for Computational Engineering and Sciences, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, United States
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23
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Calle-Vallejo F, Koper MTM, Bandarenka AS. Tailoring the catalytic activity of electrodes with monolayer amounts of foreign metals. Chem Soc Rev 2013; 42:5210-30. [PMID: 23549635 DOI: 10.1039/c3cs60026b] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
During the past decade, electrocatalysis has attracted significant attention primarily due to the increased interest in the development of new generations of devices for electrochemical energy conversion. This has resulted in a progress in both fundamental understanding of the complex electrocatalytic systems and in the development of efficient synthetic schemes to tailor the surface precisely at the atomic level. One of the viable concepts in electrocatalysis is to optimise the activity through the direct engineering of the properties of the topmost layers of the surface, where the reactions take place, with monolayer and sub-monolayer amounts of metals. This forms (bi)metallic systems where the electronic structure of the active sites is optimised using the interplay between the nature and position of the atoms of solute metals at the surface. In this review, we focus on recent theoretical and experimental achievements in designing efficient (bi)metallic electrocatalysts with selective positioning of foreign atoms to form a variety of active catalytic sites at the electrode surface. We summarize recent results published in the literature and outline challenges for computational and experimental electrocatalysis to engineer active and selective catalysts using atomic layers.
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Affiliation(s)
- Federico Calle-Vallejo
- Leiden Institute of Chemistry, Leiden University, PO box 9502, 2300 RA Leiden, The Netherlands
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24
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Anderson RM, Zhang L, Loussaert JA, Frenkel AI, Henkelman G, Crooks RM. An experimental and theoretical investigation of the inversion of pd@pt core@shell dendrimer-encapsulated nanoparticles. ACS NANO 2013; 7:9345-9353. [PMID: 24088084 DOI: 10.1021/nn4040348] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Bimetallic PdPt dendrimer-encapsulated nanoparticles (DENs) having sizes of about 2 nm were synthesized by a homogeneous route that involved (1) formation of a Pd core, (2) deposition of a Cu shell onto the Pd core in the presence of H2 gas, and (3) galvanic exchange of Pt for the Cu shell. Under these conditions, a Pd@Pt core@shell DEN is anticipated, but detailed characterization by in-situ extended X-ray absorption fine structure (EXAFS) spectroscopy and other analytical methods indicate that the metals invert to yield a Pt-rich core with primarily Pd in the shell. The experimental findings correlate well with density functional theoretical (DFT) calculations. Theory suggests that the increased disorder associated with <~2 nm diameter nanoparticles, along with the relatively large number of edge and corner sites, drives the structural rearrangement. This type of rearrangement is not observed on larger nanoparticles or in bulk metals.
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Affiliation(s)
- Rachel M Anderson
- Department of Chemistry and Biochemistry, ‡Texas Materials Institute, §Institute for Computational and Engineering Sciences, The University of Texas at Austin , 1 University Station, 105 East 24th Street Stop A5300 Austin, Texas 78712, United States
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25
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Zhang L, Iyyamperumal R, Yancey DF, Crooks RM, Henkelman G. Design of Pt-shell nanoparticles with alloy cores for the oxygen reduction reaction. ACS NANO 2013; 7:9168-9172. [PMID: 24041224 DOI: 10.1021/nn403788a] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report that the oxygen binding energy of alloy-core@Pt nanoparticles can be linearly tuned by varying the alloy-core composition. Using this tuning mechanism, we are able to predict optimal compositions for different alloy-core@Pt nanoparticles. Subsequent electrochemical measurements of ORR activities of AuPd@Pt dendrimer-encapsulated nanoparticles (DENs) are in a good agreement with the theoretical prediction that the peak of activity is achieved for a 28% Au/72% Pd alloy core supporting a Pt shell. Importantly, these findings represent an unusual case of first-principles theory leading to nearly perfect agreement with experimental results.
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Affiliation(s)
- Liang Zhang
- Department of Chemistry and Biochemistry, ‡Texas Materials Institute, and §Institute for Computational and Engineering Sciences, The University of Texas at Austin , 105 E. 24th Street, Stop A5300, Austin, Texas 78712-1224, United States
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26
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Li Y, Wu Q, Jiao S, Xu C, Wang L. Single Pt Nanowire Electrode: Preparation, Electrochemistry, and Electrocatalysis. Anal Chem 2013; 85:4135-40. [DOI: 10.1021/ac400331w] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongxin Li
- College of Chemistry and Materials
Science, Anhui Normal University, Wuhu
241000, China
- Western Transportation
Institute,
College of Engineering, Montana State University, Bozeman 59717-4250, United States
| | - Qingqing Wu
- College of Chemistry and Materials
Science, Anhui Normal University, Wuhu
241000, China
| | - Shoufeng Jiao
- College of Chemistry and Materials
Science, Anhui Normal University, Wuhu
241000, China
| | - Chaodi Xu
- College of Chemistry and Materials
Science, Anhui Normal University, Wuhu
241000, China
| | - Lun Wang
- College of Chemistry and Materials
Science, Anhui Normal University, Wuhu
241000, China
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27
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Zhang Q, Wang N, Zhao L, Xu T, Cheng Y. Polyamidoamine dendronized hollow fiber membranes in the recovery of heavy metal ions. ACS APPLIED MATERIALS & INTERFACES 2013; 5:1907-1912. [PMID: 23470134 DOI: 10.1021/am400155b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Polyamidoamine (PAMAM) dendronized hollow fiber membranes (HFMs) were synthesized and used in the recovery of heavy metal ions. The dendronized HFMs showed strong binding ability with Cu(2+), Pb(2+), and Cd(2+) ions. Generation 3 (G3) PAMAM dendronized HFM (G3-HFM) retained 72% of its Cu(2+) binding capacity after five cycles of use and recovery. Interestingly, Cu2(OH)3Cl, Pb3(CO3)2(OH)2, and CdCO3 crystals were grown on G3-HFM surface when G3-HFMs were immersed in CuCl2, Pb(NO3)2, and CdCl2 solutions, respectively, while no crystal was observed with nonmodified HFMs. The results provide new insights into the applications of membrane-supported dendrimers in the recovery of heavy metal ions.
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Affiliation(s)
- Qian Zhang
- CAS Key Laboratory of Soft Matter Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
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28
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Wu Q, Li Y, Xian H, Xu C, Wang L, Chen Z. Ultralow Pt-loading bimetallic nanoflowers: fabrication and sensing applications. NANOTECHNOLOGY 2013; 24:025501. [PMID: 23220775 DOI: 10.1088/0957-4484/24/2/025501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Ultralow Pt-loading Au nanoflowers (AuNFs) were synthesized on a glassy carbon electrode surface by the underpotential deposition (UPD) monolayer redox replacement technique, which involves redox replacement of a copper UPD monolayer by PtCl(4)(2-) that can be reduced and deposited simultaneously. Field-emission scanning electron microscopy, energy dispersive spectroscopy, x-ray photoelectron spectroscopy and the electrochemical method were utilized to characterize the ultralow Pt-loading AuNFs. Cyclic voltammogram results showed that the ultralow Pt-loading AuNFs exhibited excellent electrocatalytic activity towards the reduction of hydrogen peroxide and the oxidation of glucose in neutral media, and the reaction pathway of glucose oxidation was changed from an intermediate process based on the electrosorption of glucose to a direct oxidation process. From chronoamperometric results, it could be obtained that this prepared biosensor had wide linear ranges and very low detection limits (DLs) for H(2)O(2) (0.025-94.3 μM; DL = 0.006 μM) and glucose (0.0028-8.0 mM; DL = 0.8 μM), which were much better than previous results.
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Affiliation(s)
- Qingqing Wu
- College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China
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30
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Hydroxyl functional polyester dendrimers as stabilizing agent for preparation of colloidal silver particles—a study in respect to antimicrobial properties and toxicity against human cells. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2650-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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31
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Affiliation(s)
- Jingjing Hu
- CAS Key Laboratory of Soft Matter
Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People’s
Republic of China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter
Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, People’s
Republic of China
| | - Yiyun Cheng
- Shanghai Key Laboratory of Regulatory
Biology, School of Life Sciences, East China Normal University, Shanghai, 200241, People’s Republic of China
- Shanghai
Key Laboratory of Magnetic
Resonance, Department of Physics, East China Normal University, Shanghai, 200062, P.R.China
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32
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Carino EV, Kim HY, Henkelman G, Crooks RM. Site-Selective Cu Deposition on Pt Dendrimer-Encapsulated Nanoparticles: Correlation of Theory and Experiment. J Am Chem Soc 2012; 134:4153-62. [DOI: 10.1021/ja209115e] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Emily V. Carino
- Department
of Chemistry and Biochemistry, ‡Center for Electrochemistry, §Texas Materials Institute, and ∥Institute for
Computational and Engineering Sciences, The University of Texas at Austin, 1 University Station,
A5300 Austin, Texas 78712-0165, United States
| | - Hyun You Kim
- Department
of Chemistry and Biochemistry, ‡Center for Electrochemistry, §Texas Materials Institute, and ∥Institute for
Computational and Engineering Sciences, The University of Texas at Austin, 1 University Station,
A5300 Austin, Texas 78712-0165, United States
| | - Graeme Henkelman
- Department
of Chemistry and Biochemistry, ‡Center for Electrochemistry, §Texas Materials Institute, and ∥Institute for
Computational and Engineering Sciences, The University of Texas at Austin, 1 University Station,
A5300 Austin, Texas 78712-0165, United States
| | - Richard M. Crooks
- Department
of Chemistry and Biochemistry, ‡Center for Electrochemistry, §Texas Materials Institute, and ∥Institute for
Computational and Engineering Sciences, The University of Texas at Austin, 1 University Station,
A5300 Austin, Texas 78712-0165, United States
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33
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Myers VS, Frenkel AI, Crooks RM. In situ structural characterization of platinum dendrimer-encapsulated oxygen reduction electrocatalysts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1596-1603. [PMID: 22221003 DOI: 10.1021/la203756z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In situ electrochemical extended X-ray absorption fine structure (EXAFS) was used to evaluate the structure of Pt dendrimer-encapsulated nanoparticles (DENs) during the oxygen reduction reaction (ORR). The DENs contained an average of just 225 atoms each. The results indicate that the Pt coordination number (CN) decreases when the electrode potential is moved to positive values. The results are interpreted in terms of an ordered core, disordered shell model. The structure of the DENs is not significantly impacted by the presence of dioxygen, but other electrogenerated species may have a significant impact on nanoparticle structure.
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Affiliation(s)
- V Sue Myers
- Department of Chemistry and Biochemistry, Center for Electrochemistry, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA
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34
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Yancey DF, Zhang L, Crooks RM, Henkelman G. Au@Pt dendrimer encapsulated nanoparticles as model electrocatalysts for comparison of experiment and theory. Chem Sci 2012. [DOI: 10.1039/c2sc00971d] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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Myers VS, Weir MG, Carino EV, Yancey DF, Pande S, Crooks RM. Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications. Chem Sci 2011. [DOI: 10.1039/c1sc00256b] [Citation(s) in RCA: 283] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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