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Ouvrard A, Alyabyeva N, Zakaria AM, Yuan K, Dablemont C, Lazzari R, Charra F, Bourguignon B. Change of composition and surface plasmon resonance of Pd/Au core/shell nanoparticles triggered by CO adsorption. J Chem Phys 2024; 161:124713. [PMID: 39344890 DOI: 10.1063/5.0231175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2024] [Accepted: 09/11/2024] [Indexed: 10/01/2024] Open
Abstract
Controlling composition and plasmonic response of bimetallic nanoparticles (NPs) is of great relevance to tune their catalytic activity. Herein, we demonstrate reversible composition and plasmonic response transitions from a core/shell to a bimetallic alloyed palladium/gold NP triggered by CO adsorption and sample temperature. The use of self-organized growth on alumina template film allows scrutinizing the impact of core size and shell thickness onto NP geometry and plasmonic response. Topography, molecular adsorption, and plasmonic response are addressed by scanning tunneling microscopy, vibrational sum frequency generation (SFG) spectroscopy, and surface differential reflectance spectroscopy, respectively. Modeling CO dipolar interaction and optical reflectivity corroborate the experimental findings. We demonstrate that probing CO adsorption sites by SFG is a remarkably sensitive and relevant method to investigate shell composition and follow in real-time Pd atom migration between the core and the shell. Pd-Au alloying is limited to the first two monolayers of the shell and no plasmonic response is found, while for a thicker shell, a plasmonic response is observed, concomitant with a lower Pd concentration in the shell. Above 10-4 mbar, at room temperature, CO adsorption triggers the shell restructuration, forming a Pd-Au alloy that weakens the plasmonic response via Pd migration from the core to the shell. NP annealing at 550 K, after pumping CO, leads to the desorption of remaining CO and gives enough mobility for Pd to migrate back inside the core and recover a pure gold shell with its original plasmonic response. This work demonstrates that surface stoichiometry and plasmonic response can be tuned by using CO adsorption and NP annealing.
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Affiliation(s)
- Aimeric Ouvrard
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Natalia Alyabyeva
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Abdoul-Mouize Zakaria
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Keke Yuan
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Céline Dablemont
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - Rémi Lazzari
- Institut des NanoSciences de Paris (INSP), CNRS/Sorbonne Université, 75252 Paris, France
| | - Fabrice Charra
- Service de Physique de l'État Condensé, SPEC, CEA, CNRS, Université Paris-Saclay, CEA/Saclay, F-91191 Gif sur Yvette, France
| | - Bernard Bourguignon
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France
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2
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Pramhaas V, Unterhalt H, Freund H, Rupprechter G. Polarisationsabhängige Summenfrequenzspektroskopie (SFG) zur in situ Bestimmung der Nanopartikel-Morphologie. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 135:e202300230. [PMID: 38516007 PMCID: PMC10952846 DOI: 10.1002/ange.202300230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Indexed: 03/23/2024]
Abstract
AbstractDie Oberflächenstruktur von Metall‐Nanopartikel auf Oxidträgern lässt sich über charakteristische Schwingungen von adsorbierten Sondenmolekülen wie CO bestimmen. Üblicherweise konzentrieren sich spektroskopische Untersuchungen auf die Peak‐Position und ‐Intensität, die mit der Bindungsgeometrie bzw. der Anzahl der Adsorptionsplätze zusammenhängen. Anhand zweier unterschiedlich präparierter Modellkatalysatoren wird gezeigt, dass die polarisationsabhängige Summenfrequenzspektroskopie (SFG) die gemittelte Oberflächenstruktur und Form von Nanopartikel beleuchten kann. SFG‐Ergebnisse für verschiedene Partikelgrößen und Morphologien werden mit direkter Realraum‐Strukturanalyse mittels TEM und STM verglichen. Die beschriebene Anwendung von SFG kann zur in situ Detektion der Partikelstruktur verwendet werden und könnte ein wertvolles Werkzeug in der operando Katalyse werden.
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Affiliation(s)
- Verena Pramhaas
- Institut für MaterialchemieTU WienGetreidemarkt 9/BC1060WienÖsterreich
- Derzeitige Adresse: ZKW LichtsystemeScheibbser Strassse 173250WieselburgÖsterreich
| | - Holger Unterhalt
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614196BerlinDeutschland
- Derzeitige Adresse: Robert Bosch GmbHTübinger Straße 12372762ReutlingenDeutschland
| | - Hans‐Joachim Freund
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614196BerlinDeutschland
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3
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Pramhaas V, Unterhalt H, Freund H, Rupprechter G. Polarization-Dependent Sum-Frequency-Generation Spectroscopy for In Situ Tracking of Nanoparticle Morphology. Angew Chem Int Ed Engl 2023; 62:e202300230. [PMID: 36883879 PMCID: PMC10947018 DOI: 10.1002/anie.202300230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 03/09/2023]
Abstract
The surface structure of oxide-supported metal nanoparticles can be determined via characteristic vibrations of adsorbed probe molecules such as CO. Usually, spectroscopic studies focus on peak position and intensity, which are related to binding geometries and number of adsorption sites, respectively. Employing two differently prepared model catalysts, it is demonstrated that polarization-dependent sum-frequency-generation (SFG) spectroscopy reveals the average surface structure and shape of the nanoparticles. SFG results for different particle sizes and morphologies are compared to direct real-space structure analysis by TEM and STM. The described feature of SFG could be used to monitor particle restructuring in situ and may be a valuable tool for operando catalysis.
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Affiliation(s)
- Verena Pramhaas
- Institute of Materials ChemistryTU WienGetreidemarkt 9/BC1060ViennaAustria
- Current address: ZKW LichtsystemeScheibbser Strassse 173250WieselburgAustria
| | - Holger Unterhalt
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614196BerlinGermany
- Current address: Robert Bosch GmbHTübinger Straße 12372762ReutlingenGermany
| | - Hans‐Joachim Freund
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614196BerlinGermany
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4
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Wang L, Yang GQ, Ren X, Liu ZW. CeO 2-Promoted PtSn/SiO 2 as a High-Performance Catalyst for the Oxidative Dehydrogenation of Propane with Carbon Dioxide. NANOMATERIALS 2022; 12:nano12030417. [PMID: 35159762 PMCID: PMC8838316 DOI: 10.3390/nano12030417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 01/14/2022] [Accepted: 01/25/2022] [Indexed: 02/01/2023]
Abstract
The oxidative dehydrogenation of propane with CO2 (CO2-ODP) has been extensively investigated as a promising green technology for the efficient production of propylene, but the lack of a high-performance catalyst is still one of the main challenges for its industrial application. In this work, an efficient catalyst for CO2-ODP was developed by adding CeO2 to PtSn/SiO2 as a promoter via the simple impregnation method. Reaction results indicate that the addition of CeO2 significantly improved the catalytic activity and propylene selectivity of the PtSn/SiO2 catalyst, and the highest space-time yield of 1.75 g(C3H6)·g(catalyst)-1·h-1 was achieved over PtSn/SiO2 with a Ce loading of 6 wt%. The correlation of the reaction results with the characterization data reveals that the introduction of CeO2 into PtSn/SiO2 not only improved the Pt dispersion but also regulated the interaction between Pt and Sn species. Thus, the essential reason for the promotional effect of CeO2 on CO2-ODP performance was rationally ascribed to the enhanced adsorption of propane and CO2 originating from the rich oxygen defects of CeO2. These important understandings are applicable in further screening of promoters for the development of a high-performance Pt-based catalyst for CO2-ODP.
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5
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Model Catalysis with HOPG-Supported Pd Nanoparticles and Pd Foil: XPS, STM and C2H4 Hydrogenation. Catal Letters 2021; 152:2892-2907. [PMID: 36196216 PMCID: PMC9525433 DOI: 10.1007/s10562-021-03868-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 11/15/2021] [Indexed: 11/17/2022]
Abstract
A surface science based approach was applied to model carbon supported Pd nanoparticle catalysts. Employing physical vapour deposition of Pd on sputtered surfaces of highly oriented pyrolytic graphite (HOPG), model catalysts were prepared that are well-suited for characterization by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Analysis of the HOPG substrate before and after ion-bombardment, and of Pd/HOPG before and after annealing, revealed the number of “nominal” HOPG defects (~ 1014 cm−2) as well as the nucleation density (~ 1012 cm−2) and structural characteristics of the Pd nanoparticles (mean size/height/distribution). Two model systems were stabilized by UHV annealing to 300 °C, with mean Pd particles sizes of 4.3 and 6.8 nm and size/height aspect ratio up to ~ 10. A UHV-compatible flow microreactor and gas chromatography were used to determine the catalytic performance of Pd/HOPG in ethylene (C2H4) hydrogenation up to 150 °C under atmospheric pressure, yielding temperature-dependent conversion values, turnover frequencies (TOFs) and activation energies. The performance of Pd nanocatalysts is compared to that of polycrystalline Pd foil and contrasted to Pt/HOPG and Pt foil, pointing to a beneficial effect of the metal/carbon phase boundary, reflected by up to 10 kJ mol−1 lower activation energies for supported nanoparticles.
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6
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Carnis J, Kshirsagar AR, Wu L, Dupraz M, Labat S, Texier M, Favre L, Gao L, Oropeza FE, Gazit N, Almog E, Campos A, Micha JS, Hensen EJM, Leake SJ, Schülli TU, Rabkin E, Thomas O, Poloni R, Hofmann JP, Richard MI. Twin boundary migration in an individual platinum nanocrystal during catalytic CO oxidation. Nat Commun 2021; 12:5385. [PMID: 34508094 PMCID: PMC8433154 DOI: 10.1038/s41467-021-25625-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 08/23/2021] [Indexed: 02/08/2023] Open
Abstract
At the nanoscale, elastic strain and crystal defects largely influence the properties and functionalities of materials. The ability to predict the structural evolution of catalytic nanocrystals during the reaction is of primary importance for catalyst design. However, to date, imaging and characterising the structure of defects inside a nanocrystal in three-dimensions and in situ during reaction has remained a challenge. We report here an unusual twin boundary migration process in a single platinum nanoparticle during CO oxidation using Bragg coherent diffraction imaging as the characterisation tool. Density functional theory calculations show that twin migration can be correlated with the relative change in the interfacial energies of the free surfaces exposed to CO. The x-ray technique also reveals particle reshaping during the reaction. In situ and non-invasive structural characterisation of defects during reaction opens new avenues for understanding defect behaviour in confined crystals and paves the way for strain and defect engineering.
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Affiliation(s)
- Jérôme Carnis
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France ,grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France ,grid.7683.a0000 0004 0492 0453Present Address: Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
| | - Aseem Rajan Kshirsagar
- grid.5676.20000000417654326Grenoble-INP, SIMaP, University of Grenoble-Alpes, CNRS, Grenoble, France
| | - Longfei Wu
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France ,grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France
| | - Maxime Dupraz
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France ,grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France
| | - Stéphane Labat
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France
| | - Michaël Texier
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France
| | - Luc Favre
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France
| | - Lu Gao
- grid.6852.90000 0004 0398 8763Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Freddy E. Oropeza
- grid.6852.90000 0004 0398 8763Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Nimrod Gazit
- grid.6451.60000000121102151Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Ehud Almog
- grid.6451.60000000121102151Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Andrea Campos
- grid.5399.60000 0001 2176 4817Aix Marseille Univ, CNRS, Centrale Marseille, FSCM (FR1739), CP2M, Marseille, France
| | - Jean-Sébastien Micha
- CRG-IF BM32 beamline at the European Synchrotron (ESRF), CS40220, Grenoble Cedex 9, France
| | - Emiel J. M. Hensen
- grid.6852.90000 0004 0398 8763Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Steven J. Leake
- grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France
| | - Tobias U. Schülli
- grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France
| | - Eugen Rabkin
- grid.6451.60000000121102151Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Olivier Thomas
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France
| | - Roberta Poloni
- grid.5676.20000000417654326Grenoble-INP, SIMaP, University of Grenoble-Alpes, CNRS, Grenoble, France
| | - Jan P. Hofmann
- grid.6852.90000 0004 0398 8763Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands ,grid.6546.10000 0001 0940 1669Present Address: Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt, Darmstadt, Germany
| | - Marie-Ingrid Richard
- grid.496914.70000 0004 0385 8635Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France ,grid.5398.70000 0004 0641 6373ID01/ESRF, The European Synchrotron, Grenoble, France ,grid.457348.9Present Address: Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRS, Grenoble, France
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7
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Siburian R, Ali AMM, Sebayang K, Supeno M, Tarigan K, Simanjuntak C, Aritonang SP, Hutagalung F. The loading effect of Pt clusters on Pt/graphene nano sheets catalysts. Sci Rep 2021; 11:2532. [PMID: 33510232 PMCID: PMC7844224 DOI: 10.1038/s41598-020-80472-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 12/09/2020] [Indexed: 12/03/2022] Open
Abstract
In this paper, we report about chemically interaction between Pt Subnano-Clusters on Graphene Nano Sheets (GNS). The aim of this research is to clarify the size effect of Pt clusters on Pt 1–7 wt.%/GNS. This research is an experimental laboratory research. GNS was synthesized by using modified Hummer’s method and 1–7 wt.% Pt/GNS were prepared with impregnation method. Then, they were analyzed with TG/DTA, XRD, TEM and XPS, respectively. The results show that Pt clusters are well deposited on GNS (TG/DTA and TEM data). Those data also are consistent with XRD data. The weak and broad peaks appear at 2θ = 39°, indicating Pt metal exists on GNS. The state of Pt is confirmed by using XPS. The appearance of Pt 4f. peaks proves that Pt metal is chemical interaction on GNS. The size of Pt clusters may affect the chemically properties of Pt/GNS catalysts.
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Affiliation(s)
- Rikson Siburian
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia. .,Carbon Research Center, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia.
| | - Ab Malik Marwan Ali
- Faculty of Applied Sciences, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia.
| | - Kerista Sebayang
- Carbon Research Center, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia.,Faculty of Applied Sciences, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia
| | - Minto Supeno
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia.,Carbon Research Center, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia
| | - Kerista Tarigan
- Carbon Research Center, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia.,Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, 20155, Indonesia
| | - Crystina Simanjuntak
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia
| | - Sri Pratiwi Aritonang
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia
| | - Fajar Hutagalung
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia
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8
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Li X, Rupprechter G. Sum frequency generation spectroscopy in heterogeneous model catalysis: a minireview of CO-related processes. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01736a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sum frequency generation (SFG) vibrational spectroscopy is applied to ambient pressure surface science studies of adsorption and catalytic reactions at solid/gas interfaces.
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Affiliation(s)
- Xia Li
- Institute of Materials Chemistry
- Technische Universität Wien
- 1060 Vienna
- Austria
| | - Günther Rupprechter
- Institute of Materials Chemistry
- Technische Universität Wien
- 1060 Vienna
- Austria
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9
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Pramhaas V, Roiaz M, Bosio N, Corva M, Rameshan C, Vesselli E, Grönbeck H, Rupprechter G. Interplay between CO Disproportionation and Oxidation: On the Origin of the CO Reaction Onset on Atomic Layer Deposition-Grown Pt/ZrO 2 Model Catalysts. ACS Catal 2021; 11:208-214. [PMID: 33425478 PMCID: PMC7783867 DOI: 10.1021/acscatal.0c03974] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 11/04/2020] [Indexed: 11/29/2022]
Abstract
![]()
Pt/ZrO2 model catalysts were prepared by atomic layer
deposition (ALD) and examined at mbar pressure by operando sum frequency generation (SFG) spectroscopy and near-ambient pressure
X-ray photoelectron spectroscopy (NAP-XPS) combined with differentially
pumped mass spectrometry (MS). ALD enables creating model systems
ranging from Pt nanoparticles to bulk-like thin films. Polarization-dependent
SFG of CO adsorption reveals both the adsorption configuration and
the Pt particle morphology. By combining experimental data with ab initio density functional theory (DFT) calculations,
we show that the CO reaction onset is determined by a delicate balance
between CO disproportionation (Boudouard reaction) and oxidation.
CO disproportionation occurs on low-coordinated Pt sites, but only
at high CO coverages and when the remaining C atom is stabilized by
a favorable coordination. Thus, under the current conditions, initial
CO oxidation is found to be strongly influenced by the removal of
carbon deposits formed through disproportionation mechanisms rather
than being determined by the CO and oxygen inherent activity. Accordingly,
at variance with the general expectation, rough Pt nanoparticles are
seemingly less active than smoother Pt films. The applied approach
enables bridging both the “materials and pressure gaps”.
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Affiliation(s)
- Verena Pramhaas
- Institute of Materials Chemistry, Technische Universität Wien, Vienna 1060, Austria
| | - Matteo Roiaz
- Institute of Materials Chemistry, Technische Universität Wien, Vienna 1060, Austria
| | - Noemi Bosio
- Department of Physics and Competence Centre for Catalysis, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Manuel Corva
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- IOM-CNR Laboratorio TASC, Area Science Park, SS 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - Christoph Rameshan
- Institute of Materials Chemistry, Technische Universität Wien, Vienna 1060, Austria
| | - Erik Vesselli
- Department of Physics, University of Trieste, Via Valerio 2, 34127 Trieste, Italy
- IOM-CNR Laboratorio TASC, Area Science Park, SS 14 km 163.5, Basovizza, 34149 Trieste, Italy
| | - Henrik Grönbeck
- Department of Physics and Competence Centre for Catalysis, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Günther Rupprechter
- Institute of Materials Chemistry, Technische Universität Wien, Vienna 1060, Austria
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10
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Li X, Rupprechter G. A modeling analysis of molecular orientation at interfaces by polarization-dependent sum frequency generation vibrational spectroscopy. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(19)63357-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Roiaz M, Falivene L, Rameshan C, Cavallo L, Kozlov SM, Rupprechter G. Roughening of Copper (100) at Elevated CO Pressure: Cu Adatom and Cluster Formation Enable CO Dissociation. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2019; 123:8112-8121. [PMID: 30976376 PMCID: PMC6453259 DOI: 10.1021/acs.jpcc.8b07668] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 10/11/2018] [Indexed: 05/16/2023]
Abstract
Carbon monoxide participates in many copper-catalyzed reactions, which makes CO-induced structural changes of Cu catalysts key for important industrial processes. We have studied the interaction of carbon monoxide with the Cu(100) single crystal termination at 120, 200, and 300 K by means of low-energy electron diffraction (LEED), temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS), and density functional theory (DFT) calculations. The absorption band of CO (2082-2112 cm-1) at elevated gas pressure (up to 5 mbar) and at 200/300 K was found at a higher wavenumber than the characteristic band of the c(2 × 2)CO structure and was consistent with CO adsorbed on low-coordinated Cu atoms. The combined PM-IRAS/DFT analysis revealed that exposure to CO induced surface roughening through the formation of Cu adatoms and clusters on the (100) terraces. The roughened surface seemed surprisingly active for CO dissociation, which indicates its unique catalytic properties.
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Affiliation(s)
- Matteo Roiaz
- Institute
of Materials Chemistry, Technische Universität
Wien, 1060 Vienna, Austria
| | - Laura Falivene
- KAUST
Catalysis Center, Kind Abdullah University
of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Christoph Rameshan
- Institute
of Materials Chemistry, Technische Universität
Wien, 1060 Vienna, Austria
| | - Luigi Cavallo
- KAUST
Catalysis Center, Kind Abdullah University
of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Sergey M. Kozlov
- KAUST
Catalysis Center, Kind Abdullah University
of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Günther Rupprechter
- Institute
of Materials Chemistry, Technische Universität
Wien, 1060 Vienna, Austria
- E-mail:
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12
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Corva M, Mohamed F, Tomsic E, Feng Z, Skala T, Comelli G, Seriani N, Peressi M, Vesselli E. Substrate- to Laterally-Driven Self-Assembly Steered by Cu Nanoclusters: The Case of FePcs on an Ultrathin Alumina Film. ACS NANO 2018; 12:10755-10763. [PMID: 30212186 DOI: 10.1021/acsnano.8b05992] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We show that, for the formation of a metallorganic monolayer, it is possible to artificially divert from substrate- to laterally-driven self-assembly mechanisms by properly tailoring the corrugation of the potential energy surface of the growth template. By exploiting the capability of an ultrathin alumina film to host metallic nanoparticle seeds, we tune the symmetry of a iron phthalocyanine (FePc) two-dimensional crystal, thus showing that it is possible to switch from trans to lateral dominating interactions in the controlled growth of an organic/inorganic heterostack. Finally, by selecting the size of the metallic clusters, we can also control the FePc-metal interaction strength.
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Affiliation(s)
- Manuel Corva
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park , Basovizza, Trieste 34149 , Italy
| | - Fatema Mohamed
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
| | - Erika Tomsic
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
| | - Zhijing Feng
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park , Basovizza, Trieste 34149 , Italy
| | - Tomas Skala
- Faculty of Mathematics and Physics , Charles University , V Holešovičkách 2 , Prague 8 18000 , Czech Republic
| | - Giovanni Comelli
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park , Basovizza, Trieste 34149 , Italy
| | - Nicola Seriani
- The Abdus Salam International Centre for Theoretical Physics (ICTP) , Strada Costiera 11 , Trieste 34151 , Italy
| | - Maria Peressi
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park , Basovizza, Trieste 34149 , Italy
| | - Erik Vesselli
- Physics Department , University of Trieste , via A. Valerio 2 , Trieste 34127 , Italy
- Istituto Officina dei Materiali CNR-IOM , S.S. 14 km 163.5, Area Science Park , Basovizza, Trieste 34149 , Italy
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Vibrational fingerprint of localized excitons in a two-dimensional metal-organic crystal. Nat Commun 2018; 9:4703. [PMID: 30409974 PMCID: PMC6224418 DOI: 10.1038/s41467-018-07190-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 10/16/2018] [Indexed: 11/08/2022] Open
Abstract
Long-lived excitons formed upon visible light absorption play an essential role in photovoltaics, photocatalysis, and even in high-density information storage. Here, we describe a self-assembled two-dimensional metal-organic crystal, composed of graphene-supported macrocycles, each hosting a single FeN4 center, where a single carbon monoxide molecule can adsorb. In this heme-like biomimetic model system, excitons are generated by visible laser light upon a spin transition associated with the layer 2D crystallinity, and are simultaneously detected via the carbon monoxide ligand stretching mode at room temperature and near-ambient pressure. The proposed mechanism is supported by the results of infrared and time-resolved pump-probe spectroscopies, and by ab initio theoretical methods, opening a path towards the handling of exciton dynamics on 2D biomimetic crystals. Long-lived excitons in a two-dimensional metal-organic crystal can be produced by visible light and detected by infrared radiation. Here, the authors show that the excitonic state of a biomimetic macrocycle can be ‘read’ by measuring the vibrations of an adsorbed ligand.
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Will M, Atodiresei N, Caciuc V, Valerius P, Herbig C, Michely T. A Monolayer of Hexagonal Boron Nitride on Ir(111) as a Template for Cluster Superlattices. ACS NANO 2018; 12:6871-6880. [PMID: 29920200 DOI: 10.1021/acsnano.8b02127] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The moiré of a monolayer of hexagonal boron nitride on Ir(111) is found to be a template for Ir, C, and Au cluster superlattices. Using scanning tunneling microscopy, the cluster structure and epitaxial relation to the substrate, the cluster binding site, the role of defects, as well as the thermal stability of the cluster lattice are investigated. The Ir and C cluster superlattices display a high thermal stability, before they decay by intercalation and Smoluchowski ripening. Ab initio calculations explain the extraordinarily strong Ir cluster binding through selective sp3 rehybridization of boron nitride involving B-Ir cluster bonds and a strengthening of the nitrogen bonds to the Ir substrate in a specific, initially only chemisorbed valley area within the moiré.
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Affiliation(s)
- Moritz Will
- II. Physikalisches Institut , Universität zu Köln , Cologne D-50937 , Germany
| | - Nicolae Atodiresei
- Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1) , Forschungszentrum Jülich and JARA , Jülich D-52425 , Germany
| | - Vasile Caciuc
- Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1) , Forschungszentrum Jülich and JARA , Jülich D-52425 , Germany
| | - Philipp Valerius
- II. Physikalisches Institut , Universität zu Köln , Cologne D-50937 , Germany
| | - Charlotte Herbig
- II. Physikalisches Institut , Universität zu Köln , Cologne D-50937 , Germany
| | - Thomas Michely
- II. Physikalisches Institut , Universität zu Köln , Cologne D-50937 , Germany
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Affiliation(s)
- Elisa Jimenez-Izal
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC), 20080 Donostia, Euskadi, Spain
| | - Anastassia N. Alexandrova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, USA
- California NanoSystems Institute, Los Angeles, California 90095, USA
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