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Villagra-Soza F, Godoy S, Karelovic A, Jiménez R. Scrutinizing the mechanism of CO2 hydrogenation over Ni, CO and bimetallic NiCo surfaces: Isotopic measurements, operando-FTIR experiments and kinetics modelling. J Catal 2022. [DOI: 10.1016/j.jcat.2022.08.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Abstract
The unprecedented ability of computations to probe atomic-level details of catalytic systems holds immense promise for the fundamentals-based bottom-up design of novel heterogeneous catalysts, which are at the heart of the chemical and energy sectors of industry. Here, we critically analyze recent advances in computational heterogeneous catalysis. First, we will survey the progress in electronic structure methods and atomistic catalyst models employed, which have enabled the catalysis community to build increasingly intricate, realistic, and accurate models of the active sites of supported transition-metal catalysts. We then review developments in microkinetic modeling, specifically mean-field microkinetic models and kinetic Monte Carlo simulations, which bridge the gap between nanoscale computational insights and macroscale experimental kinetics data with increasing fidelity. We finally review the advancements in theoretical methods for accelerating catalyst design and discovery. Throughout the review, we provide ample examples of applications, discuss remaining challenges, and provide our outlook for the near future.
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Affiliation(s)
- Benjamin W J Chen
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Lang Xu
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Manos Mavrikakis
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
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3
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Schweinar K, Beeg S, Hartwig C, Rajamathi CR, Kasian O, Piccinin S, Prieto MJ, Tanase LC, Gottlob DM, Schmidt T, Raabe D, Schlögl R, Gault B, Jones TE, Greiner MT. Formation of a 2D Meta-stable Oxide by Differential Oxidation of AgCu Alloys. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23595-23605. [PMID: 32314585 PMCID: PMC7304822 DOI: 10.1021/acsami.0c03963] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 04/21/2020] [Indexed: 05/28/2023]
Abstract
Metal alloy catalysts can develop complex surface structures when exposed to reactive atmospheres. The structures of the resulting surfaces have intricate relationships with a myriad of factors, such as the affinity of the individual alloying elements to the components of the gas atmosphere and the bond strengths of the multitude of low-energy surface compounds that can be formed. Identifying the atomic structure of such surfaces is a prerequisite for establishing structure-property relationships, as well as for modeling such catalysts in ab initio calculations. Here, we show that an alloy, consisting of an oxophilic metal (Cu) diluted into a noble metal (Ag), forms a meta-stable two-dimensional oxide monolayer, when the alloy is subjected to oxidative reaction conditions. The presence of this oxide is correlated with selectivity in the corresponding test reaction of ethylene epoxidation. In the present study, using a combination of in situ, ex situ, and theoretical methods (NAP-XPS, XPEEM, LEED, and DFT), we determine the structure to be a two-dimensional analogue of Cu2O, resembling a single lattice plane of Cu2O. The overlayer holds a pseudo-epitaxial relationship with the underlying noble metal. Spectroscopic evidence shows that the oxide's electronic structure is qualitatively distinct from its three-dimensional counterpart, and because of weak electronic coupling with the underlying noble metal, it exhibits metallic properties. These findings provide precise details of this peculiar structure and valuable insights into how alloying can enhance catalytic properties.
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Affiliation(s)
- Kevin Schweinar
- Department
of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
| | - Sebastian Beeg
- Department
of Heterogeneous Reactions, Max-Planck Institute
for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Caroline Hartwig
- Department
of Heterogeneous Reactions, Max-Planck Institute
for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Catherine R. Rajamathi
- Department
of Heterogeneous Reactions, Max-Planck Institute
for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Olga Kasian
- Department
of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
- Helmholtz
Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 14109 Berlin, Germany
| | - Simone Piccinin
- CNR-IOM
DEMOCRITOS, Istituto Officina dei Materiali, Consiglio Nazionale delle
Ricerche, Via Bonomea
265, 34136 Trieste, Italy
| | - Mauricio J. Prieto
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Interface Science, Faradayweg
4-6, 14195 Berlin, Germany
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Chemical Physics, Faradayweg
4-6, 14195 Berlin, Germany
| | - Liviu C. Tanase
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Interface Science, Faradayweg
4-6, 14195 Berlin, Germany
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Chemical Physics, Faradayweg
4-6, 14195 Berlin, Germany
| | - Daniel M. Gottlob
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Chemical Physics, Faradayweg
4-6, 14195 Berlin, Germany
| | - Thomas Schmidt
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Interface Science, Faradayweg
4-6, 14195 Berlin, Germany
- Fritz-Haber-Institute
of the Max-Planck Society, Department of
Chemical Physics, Faradayweg
4-6, 14195 Berlin, Germany
| | - Dierk Raabe
- Department
of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
| | - Robert Schlögl
- Department
of Heterogeneous Reactions, Max-Planck Institute
for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Baptiste Gault
- Department
of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
- Department
of Materials, Imperial College London, Royal
School of Mines, London SW7 2AZ, U.K.
| | - Travis E. Jones
- Department
of Inorganic Chemistry, Fritz-Haber Institute
of the Max-Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Mark T. Greiner
- Department
of Heterogeneous Reactions, Max-Planck Institute
for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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Vitale A, Murad H, Abdelhafiz A, Buntin P, Alamgir FM. Sandwiched Graphene Interdiffusion Barrier for Preserving Au@Pt Atomically Thin Core@Shell Structure and the Resulting Oxygen Reduction Reaction Catalytic Activity. ACS APPLIED MATERIALS & INTERFACES 2019; 11:1026-1032. [PMID: 30511825 DOI: 10.1021/acsami.8b17274] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The concept of a core-shell metallic structures, with a few atomic layers of the "shell" metal delineated from the "core" metal with atomic sharpness opens the door to a multitude of surface-driven materials properties that can be tuned. However, in practice, such architectures are difficult to retain due to the entropic cost of a segregated near-surface architecture, and the core and surface atoms inevitably mix through interdiffusion over time. We present here a systematic study of interdiffusion in a Pt on Au core-shell architecture and the role of an interrupting single layer of graphene sandwiched between them. The physical and chemical structure of the (near)surface is probed via mean-free-path tuned X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy (HRTEM), and electrochemistry (the oxygen reduction reaction, ORR). We find that at operating temperatures above 100 °C, there is potential for interdiffusion to occur between the primary and support metals of the core-shell catalyst system, which can diminish the catalyst activity toward ORR. The introduction of a single-layer graphene, as an interface between the core and shell metal layers, acts as a barrier that prevents unwanted surface alloying between the layered metals. HRTEM imaging shows that fully wetted Pt monolayers can be grown on a graphene template, allowing a high level of surface utilization of the catalyst material. We present how the use of graphene as a barrier to diffusion mitigates the loss of surface catalytic sites, showing much improved retention of Pt monolayer surface at elevated temperatures.
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Affiliation(s)
- Adam Vitale
- Department of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332 , United States
| | - Hind Murad
- Department of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332 , United States
- Department of Physics, College of Science, Jadreya , University of Baghdad , Baghdad , Iraq
| | - Ali Abdelhafiz
- Department of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332 , United States
| | - Parker Buntin
- Department of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332 , United States
| | - Faisal M Alamgir
- Department of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive , Atlanta , Georgia 30332 , United States
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5
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Ir-Ni Bimetallic OER Catalysts Prepared by Controlled Ni Electrodeposition on Irpoly and Ir(111). SURFACES 2018. [DOI: 10.3390/surfaces1010013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The alteration of electrocatalytic surfaces with adatoms lead to structural and electronic modifications promoting adsorption, desorption, and reactive processes. This study explores the potentiostatic electrodeposition process of Ni onto polycrystalline Ir (Irpoly) and assesses the electrocatalytic properties of the resulting bimetallic surfaces. The electrodeposition resulted in bimetallic Ni overlayer (OL) structures and in combination with controlled thermal post-deposition annealing in bimetallic near-surface alloys (NSA). The catalytic oxygen evolution reaction (OER) activity of these two different Ni-modified catalysts is assessed and compared to a pristine, unmodified Irpoly. An overlayer of Ni on Irpoly showed superior performance in both acidic and alkaline milieu. The reductive annealing of the OL produced a NSA of Ni, which demonstrated enhanced stability in an acidic environment. The remarkable activity and stability improvement of Ir by Ni modification makes both systems efficient electrocatalysts for water oxidation. The roughness factor of Irpoly is also reported. With the amount of deposited Ni determined by inductively coupled plasma mass spectrometry (ICP-MS) and a degree of coverage (monolayer) in the dependence of deposition potential is established. The density functional theory (DFT) assisted evaluation of H adsorption on Irpoly enables determination of the preferred Ni deposition sites on the three low-index surfaces (111), (110), and (100).
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6
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Xu L, Stangland EE, Mavrikakis M. Ethylene versus ethane: A DFT-based selectivity descriptor for efficient catalyst screening. J Catal 2018. [DOI: 10.1016/j.jcat.2018.03.019] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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7
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Todoroki N, Kawamura R, Asano M, Sasakawa R, Takahashi S, Wadayama T. Alloy-composition-dependent oxygen reduction reaction activity and electrochemical stability of Pt-based bimetallic systems: a model electrocatalyst study of Pt/Pt xNi 100-x(111). Phys Chem Chem Phys 2018; 20:11994-12004. [PMID: 29671440 DOI: 10.1039/c8cp01217b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The oxygen reduction reaction (ORR) activity and electrochemical stability of well-defined n monolayer (ML)-Pt/PtxNi100-x(111) (n = 2 and 4; x = 75, 50, and 25) model electrocatalyst surfaces were investigated in this study. The initial activity of the as-prepared two-monolayered Pt-covered PtxNi100-x(111) substrates (2ML-Pt/PtxNi100-x(111)) increased with increasing Ni composition in the PtxNi100-x(111) substrate. In particular, 2ML-Pt/Pt25Ni75(111) showed the initial activity that was 25 times higher than that of clean Pt(111) although the higher Ni composition resulted in destabilization of the catalyst upon the application of potential cycles (PCs). As for 4ML-Pt/PtxNi100-x(111), activity enhancements were insensitive to alloy composition and thicker Pt shell layers stabilized the catalyst against PC applications. In particular, the activities of 4ML-Pt/Pt50Ni50(111) and 4ML-Pt/Pt25Ni75(111) gradually increased during 1000 PCs probably because of the PC-induced mono-atomic heights and nanometer-size islands that had (110) and (100) steps introduced into the topmost (111) terraces. Thus, the simultaneous tuning of core-alloy composition and Pt shell thickness is vital for developing practical, highly efficient Pt-based alloy ORR electrocatalysts.
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Affiliation(s)
- Naoto Todoroki
- Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan.
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8
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Kattel S, Chen JG, Liu P. Mechanistic study of dry reforming of ethane by CO2 on a bimetallic PtNi(111) model surface. Catal Sci Technol 2018. [DOI: 10.1039/c8cy00880a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combined DFT and KMC study pinpoints the origin of high selectivity toward syngas during CO2 reduction by CH3CH3 on a PtNi model catalyst.
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Affiliation(s)
- Shyam Kattel
- Chemistry Division
- Brookhaven National Laboratory
- Upton
- USA
| | - Jingguang G. Chen
- Chemistry Division
- Brookhaven National Laboratory
- Upton
- USA
- Department of Chemical Engineering
| | - Ping Liu
- Chemistry Division
- Brookhaven National Laboratory
- Upton
- USA
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9
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Alvarez AE, Sieben JM, Duarte MME. Synthesis and Characterization of Three-Dimensional Porous Cu@Pt and Cu@Pt-Ru Catalysts for Methanol Oxidation. ChemCatChem 2017. [DOI: 10.1002/cctc.201601556] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Andrea E. Alvarez
- Instituto de Ingeniería Electroquímica y Corrosión (INIEC) and CONICET; Universidad Nacional del Sur; Av. Alem 1253 B8000CPB Bahía Blanca Argentina
| | - Juan Manuel Sieben
- Instituto de Ingeniería Electroquímica y Corrosión (INIEC) and CONICET; Universidad Nacional del Sur; Av. Alem 1253 B8000CPB Bahía Blanca Argentina
| | - Marta M. E. Duarte
- Instituto de Ingeniería Electroquímica y Corrosión (INIEC) and CONICET; Universidad Nacional del Sur; Av. Alem 1253 B8000CPB Bahía Blanca Argentina
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10
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Synthesis and Electrochemical Evaluation of Carbon Supported Pt-Co Bimetallic Catalysts Prepared by Electroless Deposition and Modified Charge Enhanced Dry Impregnation. Catalysts 2016. [DOI: 10.3390/catal6060083] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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11
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Tymoczko J, Calle-Vallejo F, Čolić V, Schuhmann W, Bandarenka AS. Evaluation of the Electrochemical Stability of Model Cu-Pt(111) Near-Surface Alloy Catalysts. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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An W, Liu P. Rationalization of Au Concentration and Distribution in AuNi@Pt Core–Shell Nanoparticles for Oxygen Reduction Reaction. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01656] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wei An
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973, United States
- College
of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Ping Liu
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973, United States
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13
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Liu H, An W, Li Y, Frenkel AI, Sasaki K, Koenigsmann C, Su D, Anderson RM, Crooks RM, Adzic RR, Liu P, Wong SS. In Situ Probing of the Active Site Geometry of Ultrathin Nanowires for the Oxygen Reduction Reaction. J Am Chem Soc 2015; 137:12597-609. [PMID: 26402364 DOI: 10.1021/jacs.5b07093] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To create truly effective electrocatalysts for the cathodic reaction governing proton exchange membrane fuel cells (PEMFC), namely the oxygen reduction reaction (ORR), necessitates an accurate and detailed structural understanding of these electrocatalysts, especially at the nanoscale, and to precisely correlate that structure with demonstrable performance enhancement. To address this key issue, we have combined and interwoven theoretical calculations with experimental, spectroscopic observations in order to acquire useful structural insights into the active site geometry with implications for designing optimized nanoscale electrocatalysts with rationally predicted properties. Specifically, we have probed ultrathin (∼2 nm) core-shell Pt∼Pd9Au nanowires, which have been previously shown to be excellent candidates for ORR in terms of both activity and long-term stability, from the complementary perspectives of both DFT calculations and X-ray absorption spectroscopy (XAS). The combination and correlation of data from both experimental and theoretical studies has revealed for the first time that the catalytically active structure of our ternary nanowires can actually be ascribed to a PtAu∼Pd configuration, comprising a PtAu binary shell and a pure inner Pd core. Moreover, we have plausibly attributed the resulting structure to a specific synthesis step, namely the Cu underpotential deposition (UPD) followed by galvanic replacement with Pt. Hence, the fundamental insights gained into the performance of our ultrathin nanowires from our demonstrated approach will likely guide future directed efforts aimed at broadly improving upon the durability and stability of nanoscale electrocatalysts in general.
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Affiliation(s)
- Haiqing Liu
- Department of Chemistry, State University of New York at Stony Brook , Stony Brook, New York 11794-3400, United States
| | - Wei An
- Chemistry Department, Brookhaven National Laboratory , Building 555, Upton, New York 11973, United States
| | - Yuanyuan Li
- Department of Physics, Yeshiva University , New York, New York 10016, United States
| | - Anatoly I Frenkel
- Department of Physics, Yeshiva University , New York, New York 10016, United States
| | - Kotaro Sasaki
- Chemistry Department, Brookhaven National Laboratory , Building 555, Upton, New York 11973, United States
| | - Christopher Koenigsmann
- Department of Chemistry, State University of New York at Stony Brook , Stony Brook, New York 11794-3400, United States
| | - Dong Su
- Center for Functional Nanomaterials, Brookhaven National Laboratory , Building 735, Upton, New York 11973, United States
| | - Rachel M Anderson
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712-1224, United States
| | - Richard M Crooks
- Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712-1224, United States
| | - Radoslav R Adzic
- Chemistry Department, Brookhaven National Laboratory , Building 555, Upton, New York 11973, United States
| | - Ping Liu
- Chemistry Department, Brookhaven National Laboratory , Building 555, Upton, New York 11973, United States
| | - Stanislaus S Wong
- Department of Chemistry, State University of New York at Stony Brook , Stony Brook, New York 11794-3400, United States.,Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory , Building 480, Upton, New York 11973, United States
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14
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Direct Synthesis of Hydrogen Peroxide Over Au–Pd Catalysts Prepared by Electroless Deposition. Catal Letters 2015. [DOI: 10.1007/s10562-015-1621-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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