1
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Liu D, Wu R, Wang X, Ye R, Hu F, Chen X, Wang T, Han B, Lu ZH, Feng G, Zhang R. Catalytic CO Oxidation on the Cu +-O v-Ce 3+ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature. Inorg Chem 2024; 63:4312-4327. [PMID: 38354197 DOI: 10.1021/acs.inorgchem.3c04453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
It is crucial to eliminate CO emissions using non-noble catalysts. Cu-based catalysts have been widely applied in CO oxidation, but their activity and stability at low temperatures are still challenging. This study reports the preparation and application of an efficient copper-doped ceria electrospun fiber catalyst prepared by a facile electrospinning method. The obtained 10Cu-Ce fiber catalyst achieved complete CO oxidation at a temperature as low as 90 °C. However, a reference 10Cu/Ce catalyst prepared by the impregnation method needed 110 °C to achieve complete CO oxidation under identical reaction conditions. Asymmetric oxygen vacancies (ASOV) at the interface between copper and cerium were constructed, to effectively absorb gas molecules involved in the reaction, leading to the enhanced oxidation of CO. The exceptional ability of the 10Cu-Ce catalyst to adsorb CO is attributed to its unique structure and surface interaction phase Cu+-Ov-Ce3+, as demonstrated by a series of characterizations and DFT calculations. This novel approach of using electrospinning offers a promising technique for developing low-temperature and non-noble metal-based catalysts.
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Affiliation(s)
- Dong Liu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Rundong Wu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Xianjie Wang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Runping Ye
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Feiyang Hu
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Xiaohan Chen
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Tongtong Wang
- College of Advanced Materials Engineering, Jiaxing Nanhu University, Jiaxing 314001, P. R. China
| | - Bingying Han
- State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Zhang-Hui Lu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P.R. China
| | - Gang Feng
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Rongbin Zhang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
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2
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Li Z, Haynes BS, Montoya A. Carbon Monoxide Oxidation on Ceria-Supported Nanoclusters. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37883665 DOI: 10.1021/acsami.3c09468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2023]
Abstract
Periodic density functional theory is used to evaluate the minimum energy pathways of CO oxidation on cerium oxide-supported platinum and palladium nanoclusters (Pt/CeO2 and Pd/CeO2). For Pt/CeO2, the oxidation process involves the participation of lattice oxygen from CeO2 at the boundary sites of the cluster-ceria interface, which exhibits an exceptionally low energy barrier. Conversely, on Pd/CeO2, oxidation predominantly occurs through oxygen species bound to the Pd cluster. Experimental analysis using the temperature-programmed reduction of the oxidized Pd/CeO2 catalyst reveals a lower CO oxidation temperature compared to Pt/CeO2. This observation aligns with the anticipated decrease in the energy barrier for CO oxidation due to the oxygen coverage of the Pd cluster.
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Affiliation(s)
- Zuo Li
- Faculty of Engineering, School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Brian S Haynes
- Faculty of Engineering, School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Alejandro Montoya
- Faculty of Engineering, School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
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3
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Cavallo M, Atzori C, Signorile M, Costantino F, Venturi DM, Koutsianos A, Lomachenko KA, Calucci L, Martini F, Giovanelli A, Geppi M, Crocellà V, Taddei M. Cooperative CO 2 adsorption mechanism in a perfluorinated Ce IV-based metal organic framework. JOURNAL OF MATERIALS CHEMISTRY. A 2023; 11:5568-5583. [PMID: 36936468 PMCID: PMC10012411 DOI: 10.1039/d2ta09746j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
Adsorbents able to uptake large amounts of gases within a narrow range of pressure, i.e., phase-change adsorbents, are emerging as highly interesting systems to achieve excellent gas separation performances with little energy input for regeneration. A recently discovered phase-change metal-organic framework (MOF) adsorbent is F4_MIL-140A(Ce), based on CeIV and tetrafluoroterephthalate. This MOF displays a non-hysteretic step-shaped CO2 adsorption isotherm, reaching saturation in conditions of temperature and pressure compatible with real life application in post-combustion carbon capture, biogas upgrading and acetylene purification. Such peculiar behaviour is responsible for the exceptional CO2/N2 selectivity and reverse CO2/C2H2 selectivity of F4_MIL-140A(Ce). Here, we combine data obtained from a wide pool of characterisation techniques - namely gas sorption analysis, in situ infrared spectroscopy, in situ powder X-ray diffraction, in situ X-ray absorption spectroscopy, multinuclear solid state nuclear magnetic resonance spectroscopy and adsorption microcalorimetry - with periodic density functional theory simulations to provide evidence for the existence of a unique cooperative CO2 adsorption mechanism in F4_MIL-140A(Ce). Such mechanism involves the concerted rotation of perfluorinated aromatic rings when a threshold partial pressure of CO2 is reached, opening the gate towards an adsorption site where CO2 interacts with both open metal sites and the fluorine atoms of the linker.
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Affiliation(s)
- Margherita Cavallo
- Dipartimento di Chimica, Centro di Riferimento NIS e INSTM, Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 I-10125 Torino Italy
| | - Cesare Atzori
- Dipartimento di Chimica, Centro di Riferimento NIS e INSTM, Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 I-10125 Torino Italy
- European Synchrotron Radiation Facility 71 Avenue des Martyrs, CS 40220 38043 Grenoble Cedex 9 France
| | - Matteo Signorile
- Dipartimento di Chimica, Centro di Riferimento NIS e INSTM, Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 I-10125 Torino Italy
| | - Ferdinando Costantino
- Dipartimento di Chimica, Biologia e Biotecnologie, Unità di Ricerca INSTM, Università di Perugia Via Elce di Sotto 8 06123 Perugia Italy
| | - Diletta Morelli Venturi
- Dipartimento di Chimica, Biologia e Biotecnologie, Unità di Ricerca INSTM, Università di Perugia Via Elce di Sotto 8 06123 Perugia Italy
| | - Athanasios Koutsianos
- Centre for Research & Technology Hellas/Chemical Process and Energy Resources Institute 6th km. Charilaou-Thermis 57001 Greece
| | - Kirill A Lomachenko
- European Synchrotron Radiation Facility 71 Avenue des Martyrs, CS 40220 38043 Grenoble Cedex 9 France
| | - Lucia Calucci
- Istituto di Chimica dei Composti Organo Metallici, Unità di Ricerca INSTM, Consiglio Nazionale delle Ricerche Via Giuseppe Moruzzi 1 56124 Pisa Italy
- Centro per l'Integrazione della Strumentazione Scientifica dell'Università di Pisa (CISUP) 56126 Pisa Italy
| | - Francesca Martini
- Centro per l'Integrazione della Strumentazione Scientifica dell'Università di Pisa (CISUP) 56126 Pisa Italy
- Dipartimento di Chimica e Chimica Industriale, Unità di Ricerca INSTM, Università di Pisa Via Giuseppe Moruzzi 13 56124 Pisa Italy
| | - Andrea Giovanelli
- Dipartimento di Chimica e Chimica Industriale, Unità di Ricerca INSTM, Università di Pisa Via Giuseppe Moruzzi 13 56124 Pisa Italy
| | - Marco Geppi
- Centro per l'Integrazione della Strumentazione Scientifica dell'Università di Pisa (CISUP) 56126 Pisa Italy
- Dipartimento di Chimica e Chimica Industriale, Unità di Ricerca INSTM, Università di Pisa Via Giuseppe Moruzzi 13 56124 Pisa Italy
| | - Valentina Crocellà
- Dipartimento di Chimica, Centro di Riferimento NIS e INSTM, Università di Torino Via G. Quarello 15, I-10135 and Via P. Giuria 7 I-10125 Torino Italy
| | - Marco Taddei
- Centro per l'Integrazione della Strumentazione Scientifica dell'Università di Pisa (CISUP) 56126 Pisa Italy
- Dipartimento di Chimica e Chimica Industriale, Unità di Ricerca INSTM, Università di Pisa Via Giuseppe Moruzzi 13 56124 Pisa Italy
- Energy Safety Research Institute, Swansea University Fabian Way Swansea SA1 8EN UK
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4
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Zhang X, Zhu L, Hou Q, Guan J, Lu Y, Keal TW, Buckeridge J, Catlow CRA, Sokol AA. Toward a Consistent Prediction of Defect Chemistry in CeO 2. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:207-227. [PMID: 36644213 PMCID: PMC9835833 DOI: 10.1021/acs.chemmater.2c03019] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/25/2022] [Indexed: 05/10/2023]
Abstract
Polarizable shell-model potentials are widely used for atomic-scale modeling of charged defects in solids using the Mott-Littleton approach and hybrid Quantum Mechanical/Molecular Mechanical (QM/MM) embedded-cluster techniques. However, at the pure MM level of theory, the calculated defect energetics may not satisfy the requirement of quantitative predictions and are limited to only certain charged states. Here, we proposed a novel interatomic potential development scheme that unifies the predictions of all relevant charged defects in CeO2 based on the Mott-Littleton approach and QM/MM electronic-structure calculations. The predicted formation energies of oxygen vacancies accompanied by different excess electron localization patterns at the MM level of theory reach the accuracy of density functional theory (DFT) calculations using hybrid functionals. The new potential also accurately reproduces a wide range of physical properties of CeO2, showing excellent agreement with experimental and other computational studies. These findings provide opportunities for accurate large-scale modeling of the partial reduction and nonstoichiometry in CeO2, as well as a prototype for developing robust interatomic potentials for other defective crystals.
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Affiliation(s)
- Xingfan Zhang
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
| | - Lei Zhu
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
| | - Qing Hou
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
- Institute
of Photonic Chips, University of Shanghai
for Science and Technology, Shanghai200093, China
| | - Jingcheng Guan
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
| | - You Lu
- Scientific
Computing Department, STFC Daresbury Laboratory, Warrington, CheshireWA4 4AD, United Kingdom
| | - Thomas W. Keal
- Scientific
Computing Department, STFC Daresbury Laboratory, Warrington, CheshireWA4 4AD, United Kingdom
| | - John Buckeridge
- School
of Engineering, London South Bank University, LondonSE1 OAA, United Kingdom
| | - C. Richard A. Catlow
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
- School
of Chemistry, Cardiff University, Park Place, CardiffCF10 1AT, United
Kingdom
| | - Alexey A. Sokol
- Kathleen
Lonsdale Materials Chemistry, Department of Chemistry, University College London, LondonWC1H 0AJ, United Kingdom
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5
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Yang G, Liang Y, Zheng H, Yang J, Guo S, Yu H. A self-circulating cerium-rich CeO2-x/Bi2MoO6 heterojunction catalyst for boosting photo-Fenton degradation of fluoroquinolone antibiotics. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.123084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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6
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A theoretical catalytic mechanism for methanol reforming in CeO2 vs Ni/CeO2 by energy transition states profiles. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.05.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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7
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Ma H, Liu Z, Koshy P, Sorrell CC, Hart JN. Density Functional Theory Investigation of the Biocatalytic Mechanisms of pH-Driven Biomimetic Behavior in CeO 2. ACS APPLIED MATERIALS & INTERFACES 2022; 14:11937-11949. [PMID: 35229603 DOI: 10.1021/acsami.1c24686] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
There is considerable interest in the pH-dependent, switchable, biocatalytic properties of cerium oxide (CeO2) nanoparticles in biomedicine, where these materials exhibit beneficial antioxidant activity against reactive oxygen species (ROS) at a basic physiological pH but cytotoxic prooxidant activity in an acidic cancer cell pH microenvironment. While the general characteristics of the role of oxygen vacancies are known, the mechanism of their action at the atomic scale under different pH conditions has yet to be elucidated. The present work applies density functional theory (DFT) calculations to interpret, at the atomic scale, the pH-induced behavior of the stable {111} surface of CeO2 containing oxygen vacancies. Analysis of the surface-adsorbed media species reveals the critical role of pH on the interaction between ROS (•O2- and H2O2) and the defective CeO2 {111} surface. Under basic conditions, the superoxide dismutase (SOD) and catalase (CAT) biomimetic reactions can be performed cyclically, scavenging and decomposing ROS to harmless products, making CeO2 an excellent antioxidant. However, under acidic conditions, the CAT biomimetic reaction is hindered owing to the limited reversibility of Ce3+ ↔ Ce4+ and formation ↔ annihilation of oxygen vacancies. A Fenton biomimetic reaction (H2O2 + Ce3+ → Ce4+ + OH- + •OH) is predicted to occur simultaneously with the SOD and CAT biomimetic reactions, resulting in the formation of hydroxyl radicals, making CeO2 a cytotoxic prooxidant.
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Affiliation(s)
- Hongyang Ma
- School of Materials Science and Engineering, UNSW Sydney, Sydney, New South Wales2052, Australia
| | - Zhao Liu
- Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai519082, China
| | - Pramod Koshy
- School of Materials Science and Engineering, UNSW Sydney, Sydney, New South Wales2052, Australia
| | - Charles C Sorrell
- School of Materials Science and Engineering, UNSW Sydney, Sydney, New South Wales2052, Australia
| | - Judy N Hart
- School of Materials Science and Engineering, UNSW Sydney, Sydney, New South Wales2052, Australia
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8
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Brugnoli L, Urata S, Pedone A. H 2O 2adsorption and dissociation on various CeO 2(111) surface models: a first-principles study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:164006. [PMID: 35130519 DOI: 10.1088/1361-648x/ac5278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 02/07/2022] [Indexed: 06/14/2023]
Abstract
Periodic density functional theory (DFT) calculations using the hybrid PBE0 functional and atom-centered Gaussian functions as basis sets were carried out to investigate the absorption and the first steps involved in the decomposition of hydrogen peroxide (H2O2) on three different models of the ceria (111) surface. One of the models is a clean surface, and the others are defective and partially hydroxylated ceria surfaces. On the clean surface, we found that the minimum energy path of hydrogen peroxide decomposition involves a three-step process, i.e., adsorption, deprotonation, and formation of the peroxide anion, stabilized through its interaction with the surface at a Ce (IV) site, with activation barriers of less than about 0.5 eV. The subsequent formation of superoxide anions and molecular oxygen species is attributed to electron transfer from the reactants to the Ce (IV) ions underneath. On the defective surface, H2O2dissociation is an energetically downhill reaction thermodynamically driven by the healing of the O vacancies, after the reduction and decomposition of H2O2into oxygen and water. On the hydroxylated surface, H2O2is first adsorbed by forming a favorable H-bond and then undergoes heterolytic dissociation, forming two hydroxyl groups at two vicinal Ce sites.
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Affiliation(s)
- Luca Brugnoli
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
| | - Shingo Urata
- Planning Division, AGC Inc., Yokohama, Kanagawa 230-0045, Japan
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, 41125 Modena, Italy
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9
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Harb H, Hratchian HP. A Density Functional Theory Investigation of the Reaction of Water with Ce2O-. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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10
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Sun J, Yamaguchi D, Tang L, Periasamy S, Ma H, Hart JN, Chiang K. Enhancement of oxygen exchanging capability by loading a small amount of ruthenium over ceria-zirconia on dry reforming of methane. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.103407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Pedrielli A, de Vera P, Trevisanutto PE, Pugno NM, Garcia-Molina R, Abril I, Taioli S, Dapor M. Electronic excitation spectra of cerium oxides: from ab initio dielectric response functions to Monte Carlo electron transport simulations. Phys Chem Chem Phys 2021; 23:19173-19187. [PMID: 34357365 DOI: 10.1039/d1cp01810h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanomaterials made of cerium oxides CeO2 and Ce2O3 have a broad range of applications, from catalysts in automotive, industrial or energy operations to promising materials to enhance hadrontherapy effectiveness in oncological treatments. To elucidate the physico-chemical mechanisms involved in these processes, it is of paramount importance to know the electronic excitation spectra of these oxides, which are obtained here through high-accuracy linear-response time-dependent density functional theory calculations. In particular, the macroscopic dielectric response functions of both bulk CeO2 and Ce2O3 are derived, which compare remarkably well with the available experimental data. These results stress the importance of appropriately accounting for local field effects to model the dielectric function of metal oxides. Furthermore, we reckon the energy loss functions Im(-1/) of the materials, including the accurate evaluation of the momentum transfer dispersion from first-principles calculations. In this respect, by using Mermin-type parametrization we are able to model the contribution of different electronic excitations to the dielectric loss function. Finally, from the knowledge of the electron inelastic mean free path, together with the elastic mean free path provided by the relativistic Mott theory, we carry out statistical Monte Carlo (MC) electron transport simulations to reproduce the major features of the reported experimental reflection electron energy loss (REEL) spectra of cerium oxides. The good agreement with REEL experimental data strongly supports our approach based on MC modelling, whose main inputs were obtained using ab initio calculated electronic excitation spectra in a broad range of momentum and energy transfers.
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Affiliation(s)
- Andrea Pedrielli
- European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-Bruno Kessler Foundation) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN), Trento, Italy. .,Laboratory of Bio-Inspired, Bionic, Nano, Meta Materials & Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Italy
| | - Pablo de Vera
- European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-Bruno Kessler Foundation) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN), Trento, Italy.
| | | | - Nicola M Pugno
- Laboratory of Bio-Inspired, Bionic, Nano, Meta Materials & Mechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Italy.,School of Engineering and Materials Science, Queen Mary University of London, UK
| | - Rafael Garcia-Molina
- Departamento de Física, Centro de Investigación en Óptica y Nanofísica, Universidad de Murcia, Spain
| | - Isabel Abril
- Departament de Física Aplicada, Universitat d'Alacant, Spain
| | - Simone Taioli
- European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-Bruno Kessler Foundation) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN), Trento, Italy. .,Peter the Great St. Petersburg Polytechnic University, Russia
| | - Maurizio Dapor
- European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*-Bruno Kessler Foundation) and Trento Institute for Fundamental Physics and Applications (TIFPA-INFN), Trento, Italy.
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12
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Sun HY, Li SX, Jiang H. Pros and cons of the time-dependent hybrid density functional approach for calculating the optical spectra of solids: a case study of CeO 2. Phys Chem Chem Phys 2021; 23:16296-16306. [PMID: 34312647 DOI: 10.1039/d1cp02049h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The prediction of optical spectra of complex solids remains a great challenge for first-principles calculations due to the huge computational cost of the state-of-the-art many-body perturbation theory based GW-Bethe Salpeter equation (BSE) approach. An alternative method is the time-dependent density-functional theory (TDDFT) based on hybrid exchange-correlation functionals, which involves the essential ingredients of electron-hole interactions in its formalism in contrast to its local/semi-local functional counterparts. In this work, we investigate the optical absorption spectra of ceria (CeO2), a prototypical lanthanide oxide with a 4f0 configuration, utilizing TDDFT based on four well-established hybrid functionals for ground state DFT calculations. All four functionals reproduce well the excitonic features of the experimental optical spectra, in spite of the significant differences in their band structures arising from different hybridization parameters (i.e. the fraction of the Hartree-Fock exchange and the screening parameter). It is demonstrated that the apparently weak dependence of the resulting optical spectra on the employed functionals is quite universal and applies to simple semiconductors such as Si and GaAs and insulator LiF as well. This study highlights the feasibility of TDDFT based on existing hybrids to describe optical spectra of solids, and also, points out the difficulty of obtaining accurate exciton binding energies using these hybrid functionals due to the strong functional dependence of quasi-particle band structures.
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Affiliation(s)
- Huai-Yang Sun
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
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13
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Schäfer T, Daelman N, López N. Cerium Oxides without U: The Role of Many-Electron Correlation. J Phys Chem Lett 2021; 12:6277-6283. [PMID: 34212726 PMCID: PMC8397342 DOI: 10.1021/acs.jpclett.1c01589] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 06/29/2021] [Indexed: 05/14/2023]
Abstract
Electron transfer with changing occupation in the 4f subshell poses a considerable challenge for quantitative predictions in quantum chemistry. Using the example of cerium oxide, we identify the main deficiencies of common parameter-dependent one-electron approaches, such as density functional theory (DFT) with a Hubbard correction, or hybrid functionals. As a response, we present the first benchmark of ab initio many-electron theory for electron transfer energies and lattice parameters under periodic boundary conditions. We show that the direct random phase approximation clearly outperforms all DFT variations. From this foundation, we, then, systematically improve even further. Periodic second-order Møller-Plesset perturbation theory meanwhile manages to recover standard hybrid functional values. Using these approaches to eliminate parameter bias allows for highly accurate benchmarks of strongly correlated materials, the reliable assessment of various density functionals, and functional fitting via machine-learning.
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Affiliation(s)
- Tobias Schäfer
- Institute
for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10/136, 1040 Vienna, Austria
| | - Nathan Daelman
- Institute
of Chemical Research of Catalonia, The Barcelona
Institute of Science and Technology, 43007 Tarragona, Spain
| | - Núria López
- Institute
of Chemical Research of Catalonia, The Barcelona
Institute of Science and Technology, 43007 Tarragona, Spain
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14
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Brugnoli L, Menziani MC, Urata S, Pedone A. Development and Application of a ReaxFF Reactive Force Field for Cerium Oxide/Water Interfaces. J Phys Chem A 2021; 125:5693-5708. [PMID: 34152149 DOI: 10.1021/acs.jpca.1c04078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ceria (CeO2) is a well-known catalytic oxide with many environmental, energy production, and industrial applications, most of them involving water as a reactant, byproduct, solvent, or simple spectator. In this work, we parameterized a Ce/O/H ReaxFF for the study of ceria and ceria/water interfaces. The parameters were fitted to an ab initio training set obtained at the DFT/PBE0 level, including the structures, cohesive energies, and elastic properties of the crystalline phases Ce, CeO2, and Ce2O3; the O-defective structures and energies of vacancy formation on CeO2 bulk and CeO2 (111) surface, as well as the absorption and reaction energies of H2 and H2O molecules on CeO2 (111). The new potential reproduced reasonably well all the fitted properties as well as the relative stabilities of the different ceria surfaces, the oxygen vacancies formation, and the energies and structures of associative and dissociative water molecules on them. Molecular dynamics simulations of the liquid water on the CeO2 (111) and CeO2 (100) surfaces were carried out to study the coverage and the mechanism of water dissociation. After equilibration, on average, 35% of surface sites of CeO2 (111) are hydroxylated whereas 15% of them are saturated with molecular water associatively adsorbed. As for the CeO2 (100) surface, we observed that water preferentially dissociates covering 90% of the available surface sites in excellent agreement with recent experimental findings.
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Affiliation(s)
- Luca Brugnoli
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, Modena 41125, , Italy
| | - Maria Cristina Menziani
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, Modena 41125, , Italy
| | - Shingo Urata
- Innovative Technology Laboratories, AGC Inc., Yokohama, Kanagawa 230-0045, Japan
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via G. Campi 103, Modena 41125, , Italy
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15
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Desmarais JK, Erba A, Pan Y, Civalleri B, Tse JS. Mechanisms for Pressure-Induced Isostructural Phase Transitions in EuO. PHYSICAL REVIEW LETTERS 2021; 126:196404. [PMID: 34047588 DOI: 10.1103/physrevlett.126.196404] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/01/2021] [Accepted: 04/22/2021] [Indexed: 06/12/2023]
Abstract
We study pressure-induced isostructural electronic phase transitions in the prototypical mixed valence and strongly correlated material EuO using the global-hybrid density functional theory. The simultaneous presence in the valence of highly localized d- and f-type bands and itinerant s- and p-type states, as well as the half-filled f-type orbital shell with seven unpaired electrons on each Eu atom, have made the description of the electronic features of this system a challenge. The electronic band structure, density of states, and atomic oxidation states of EuO are analyzed in the 0-50 GPa pressure range. An insulator-to-metal transition at about 12 GPa of pressure was identified. The second isostructural transition at approximately 30-35 GPa, previously believed to be driven by an oxidation from Eu(II) to Eu(III), is shown instead to be associated with a change in the occupation of the Eu d orbitals, as can be determined from the analysis of the corresponding atomic orbital populations. The Eu d band is confined by the surrounding oxygens and split by the crystal field, which results in orbitals of e_{g} symmetry (i.e., d_{x^{2}-y^{2}} and d_{2z^{2}-x^{2}-y^{2}}, pointing along the Eu-O direction) being abruptly depopulated at the transition as a means to alleviate electron-electron repulsion in the highly compressed structures.
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Affiliation(s)
- Jacques K Desmarais
- Dipartimento di Chimica e NIS centro interdipartimentale, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
- Equipe de Chimie Physique, IPREM UMR5254, Université de Pau et des Pays de lAdour, 64053, Pau, CEDEX 9, France
- Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Alessandro Erba
- Dipartimento di Chimica e NIS centro interdipartimentale, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - Yuanming Pan
- Department of Geological Sciences, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Bartolomeo Civalleri
- Dipartimento di Chimica e NIS centro interdipartimentale, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - John S Tse
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
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16
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Reaction characteristics investigation of CeO2-enhanced CaSO4 oxygen carrier with lignite. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2021.02.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Lawrence EL, Levin BDA, Boland T, Chang SLY, Crozier PA. Atomic Scale Characterization of Fluxional Cation Behavior on Nanoparticle Surfaces: Probing Oxygen Vacancy Creation/Annihilation at Surface Sites. ACS NANO 2021; 15:2624-2634. [PMID: 33507063 DOI: 10.1021/acsnano.0c07584] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Oxygen vacancy creation and annihilation are key processes in nonstoichiometric oxides such as CeO2. The oxygen vacancy creation and annihilation rates on an oxide's surface partly govern its ability to exchange oxygen with the ambient environment, which is critical for a number of applications including energy technologies, environmental pollutant remediation, and chemical synthesis. Experimental methods to probe and correlate local oxygen vacancy reaction rates with atomic-level structural heterogeneities would provide significant information for the rational design and control of surface functionality; however, such methods have been unavailable to date. Here, we characterize picoscale fluxional behavior in cations using time-resolved in situ aberration-corrected transmission electron microscopy to locate atomic-level variations in oxygen vacancy creation and annihilation rates on oxide nanoparticle surfaces. Low coordination number sites such as steps and edges, as well as locally strained sites, exhibited the greatest number of cation displacements, implying enhanced surface oxygen vacancy activity at these sites. The approach has potential applications to a much wider class of materials and catalysis problems involving surface and interfacial transport functionalities.
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Affiliation(s)
- Ethan L Lawrence
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Barnaby D A Levin
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Tara Boland
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Shery L Y Chang
- Eyring Materials Center, Arizona State University, Tempe, Arizona 85287, United States
| | - Peter A Crozier
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
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18
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Lustemberg PG, Plessow PN, Wang Y, Yang C, Nefedov A, Studt F, Wöll C, Ganduglia-Pirovano MV. Vibrational Frequencies of Cerium-Oxide-Bound CO: A Challenge for Conventional DFT Methods. PHYSICAL REVIEW LETTERS 2020; 125:256101. [PMID: 33416353 DOI: 10.1103/physrevlett.125.256101] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 09/04/2020] [Accepted: 11/09/2020] [Indexed: 06/12/2023]
Abstract
In ceria-based catalysis, the shape of the catalyst particle, which determines the exposed crystal facets, profoundly affects its reactivity. The vibrational frequency of adsorbed carbon monoxide (CO) can be used as a sensitive probe to identify the exposed surface facets, provided reference data on well-defined single crystal surfaces together with a definitive theoretical assignment exist. We investigate the adsorption of CO on the CeO_{2}(110) and (111) surfaces and show that the commonly applied DFT(PBE)+U method does not provide reliable CO vibrational frequencies by comparing with state-of-the-art infrared spectroscopy experiments for monocrystalline CeO_{2} surfaces. Good agreement requires the hybrid DFT approach with the HSE06 functional. The failure of conventional density-functional theory (DFT) is explained in terms of its inability to accurately describe the facet- and configuration-specific donation and backdonation effects that control the changes in the C─O bond length upon CO adsorption and the CO force constant. Our findings thus provide a theoretical basis for the detailed interpretation of experiments and open up the path to characterize more complex scenarios, including oxygen vacancies and metal adatoms.
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Affiliation(s)
- Pablo G Lustemberg
- Institute of Physics Rosario, IFIR, National Scientific and Technical Research Council, CONICET, and National University of Rosario, UNR, S2000EKF Rosario, Santa Fe, Argentina
- Institute of Catalysis and Petrochemistry, ICP, Spanish National Research Council, CSIC, 28049 Madrid, Spain
| | - Philipp N Plessow
- Institute of Catalysis Research and Technology, IKFT, Karlsruhe Institute of Technology, KIT, 76344 Eggenstein-Leopoldshafen, Germany
| | - Yuemin Wang
- Institute for Chemical Technology and Polymer Chemistry, ITCP, Karlsruhe Institute of Technology, KIT, Karlsruhe 76131, Germany
| | - Chengwu Yang
- Institute for Chemical Technology and Polymer Chemistry, ITCP, Karlsruhe Institute of Technology, KIT, Karlsruhe 76131, Germany
| | - Alexei Nefedov
- Institute for Chemical Technology and Polymer Chemistry, ITCP, Karlsruhe Institute of Technology, KIT, Karlsruhe 76131, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology, IKFT, Karlsruhe Institute of Technology, KIT, 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry, ITCP, Karlsruhe Institute of Technology, KIT, Karlsruhe 76131, Germany
| | - Christof Wöll
- Institute of Functional Interfaces, IFG, Karlsruhe Institute of Technology, KIT, 76344 Eggenstein-Leopoldshafen, Germany
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19
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Marciniak AA, Henrique FJ, de Lima AF, Alves OC, Moreira CR, Appel LG, Mota CJ. What are the preferred CeO2 exposed planes for the synthesis of dimethyl carbonate? Answers from theory and experiments. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Benedetti S, Righi G, Luches P, D'Addato S, Magri R, Selloni A. Surface Reactivity of Ag-Modified Ceria to Hydrogen: A Combined Experimental and Theoretical Investigation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:27682-27690. [PMID: 32508088 DOI: 10.1021/acsami.0c03968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the mechanism of H2 activation on Ag-modified cerium oxide surfaces, of interest for different catalytic applications. The study is performed on thin epitaxial cerium oxide films, investigated by X-ray photoemission spectroscopy to assess the changes of both the Ag oxidation state and the concentration of Ce3+ ions, O vacancies, and hydroxyl groups on the surface during thermal reduction cycles in vacuum and under hydrogen exposure. The results are interpreted using density functional theory calculations to model pristine and Ag-modified ceria surfaces. Although the reactivity of ceria toward H2 oxidation improves when a fraction of Ce cations is substituted with Ag, the concentration of reduced Ce3+ ions in Ag-modified ceria is found to be lower than in pure ceria under the same conditions. This behavior is observed even though the number of surface oxygen vacancies caused by the thermal treatment under hydrogen exposure is larger for the Ag-modified surface. These results are explained in terms of a change of the oxidation state of the surface Ag, which is able to acquire some of the extra surface electrons created by the oxygen vacancies and the adsorbed hydrogen atoms. Our findings provide new insights into the reactivity of Ag-modified ceria, which has been proposed as a promising alternative to platinum electrodes in electrochemical devices.
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Affiliation(s)
| | - Giulia Righi
- CNR-Instituto Nanoscienze, via Campi 213/A, 41125 Modena, Italy
- Dipartimento di Fisica, Informatica e Matematica, Università di Modena e Reggio-Emilia, via Campi 213/A, 41125 Modena, Italy
| | - Paola Luches
- CNR-Instituto Nanoscienze, via Campi 213/A, 41125 Modena, Italy
| | - Sergio D'Addato
- CNR-Instituto Nanoscienze, via Campi 213/A, 41125 Modena, Italy
- Dipartimento di Fisica, Informatica e Matematica, Università di Modena e Reggio-Emilia, via Campi 213/A, 41125 Modena, Italy
| | - Rita Magri
- CNR-Instituto Nanoscienze, via Campi 213/A, 41125 Modena, Italy
- Dipartimento di Fisica, Informatica e Matematica, Università di Modena e Reggio-Emilia, via Campi 213/A, 41125 Modena, Italy
| | - Annabella Selloni
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540, United States
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21
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Polliotto V, Albanese E, Livraghi S, Agnoli S, Pacchioni G, Giamello E. Structural, electronic and photochemical properties of cerium-doped zirconium titanate. Catal Today 2020. [DOI: 10.1016/j.cattod.2018.09.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Zhao Q, Kulik HJ. Stable Surfaces That Bind Too Tightly: Can Range-Separated Hybrids or DFT+U Improve Paradoxical Descriptions of Surface Chemistry? J Phys Chem Lett 2019; 10:5090-5098. [PMID: 31411023 PMCID: PMC6748670 DOI: 10.1021/acs.jpclett.9b01650] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 08/14/2019] [Indexed: 05/25/2023]
Abstract
Approximate, semilocal density functional theory (DFT) suffers from delocalization error that can lead to a paradoxical model of catalytic surfaces that both overbind adsorbates yet are also too stable. We investigate the effect of two widely applied approaches for delocalization error correction, (i) affordable DFT+U (i.e., semilocal DFT augmented with a Hubbard U) and (ii) hybrid functionals with an admixture of Hartree-Fock (HF) exchange, on surface and adsorbate energies across a range of rutile transition metal oxides widely studied for their promise as water-splitting catalysts. We observe strongly row- and period-dependent trends with DFT+U, which increases surface formation energies only in early transition metals (e.g., Ti and V) and decreases adsorbate energies only in later transition metals (e.g., Ir and Pt). Both global and local hybrids destabilize surfaces and reduce adsorbate binding across the periodic table, in agreement with higher-level reference calculations. Density analysis reveals why hybrid functionals correct both quantities, whereas DFT+U does not. We recommend local, range-separated hybrids for the accurate modeling of catalysis in transition metal oxides at only a modest increase in computational cost over semilocal DFT.
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Affiliation(s)
- Qing Zhao
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
- Department
of Mechanical Engineering, Massachusetts
Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Heather J. Kulik
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
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23
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Ashburn N, Zheng Y, Thampy S, Dillon S, Chabal YJ, Hsu JWP, Cho K. Integrated Experimental-Theoretical Approach To Determine Reliable Molecular Reaction Mechanisms on Transition-Metal Oxide Surfaces. ACS APPLIED MATERIALS & INTERFACES 2019; 11:30460-30469. [PMID: 31353881 DOI: 10.1021/acsami.9b09700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
By combining experimental and theoretical approaches, we investigate the quantitative relationship between molecular desorption temperature and binding energy on d and f metal oxide surfaces. We demonstrate how temperature-programmed desorption can be used to quantitatively correlate the theoretical surface chemistry of metal oxides (via on-site Hubbard U correction) to gas surface interactions for catalytic reactions. For this purpose, both CO and NO oxidation mechanisms are studied in a step-by-step reaction process for perovskite and mullite-type oxides, respectively. Additionally, we show solutions for over-binding issues found in COx, NOx, SOx, and other covalently bonded molecules that must be considered during surface reaction modeling. This work shows the high reliability of using TPD and density functional theory in conjunction to create accurate surface chemistry information for a variety of correlated metal oxide materials.
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Affiliation(s)
- Nickolas Ashburn
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Yongping Zheng
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Sampreetha Thampy
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Sean Dillon
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Yves J Chabal
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Julia W P Hsu
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
| | - Kyeongjae Cho
- Department of Material Science and Engineering , University of Texas at Dallas , Richardson , Texas 75080 , United States
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24
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Liu Z, Sorrell CC, Koshy P, Hart JN. DFT Study of Methanol Adsorption on Defect-Free CeO 2 Low-Index Surfaces. Chemphyschem 2019; 20:2074-2081. [PMID: 31232505 DOI: 10.1002/cphc.201900583] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Indexed: 11/06/2022]
Abstract
Methanol decomposition is a promising method for hydrogen production. However, the performance of current catalysts for this process is not sufficient for commercial applications. In this work, methanol adsorption on the CeO2 low-index surfaces is studied by density functional theory (DFT). The results show that methanol always dissociates spontaneously on the (100) surface, whereas dissociation on the (110) surface is site-selective; dissociation does not occur at all on the (111) surface, where only weak physisorption is found. The results confirm that surfaces with higher energies are more catalytically active. Analysis of the surface geometries shows that the dominant factors for the dissociation of methanol are the degree of undercoordination and the charges of the surface ions. The adsorption energy of each methanol molecule decreases with increasing coverage and there is a transition threshold between dissociative and associative adsorption. The present work indicates that a strategy to design catalysts with high activity is to maximize exposure of surfaces on which the ions have a high degree of undercoordination and a strong tendency to donate/accept electrons. The results demonstrate the importance of appropriately selecting and controlling exposed facets and particle morphology for optimizing catalyst performance.
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Affiliation(s)
- Zhao Liu
- Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.,School of Materials Science and Engineering, UNSW Sydney, NSW, 2052, Australia
| | - Charles C Sorrell
- School of Materials Science and Engineering, UNSW Sydney, NSW, 2052, Australia
| | - Pramod Koshy
- School of Materials Science and Engineering, UNSW Sydney, NSW, 2052, Australia
| | - Judy N Hart
- School of Materials Science and Engineering, UNSW Sydney, NSW, 2052, Australia
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25
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Abstract
Fundamental studies of the interaction of adsorbates with metal oxides alone and on which a noble metal is deposited provide information needed for catalytic reactions. Rh/CeO2 is one of the textbook catalysts for many reactions including syngas conversion to ethanol, water gas shift reaction (WGSR), and ethanol steam reforming. In this work, the adsorption of CO is studied by infrared (IR) spectroscopy, over CeO2 and 0.6 at. % Rh/CeO2 at a temperature range of 90 to 300 K. CeO2 is in the form of nanoparticles with sizes between 5 and 10 nm and exposing predominantly {111} surface termination in addition to non-negligible fraction of the {100} termination, determined from high resolution transmission electron microscopy (HRTEM). The as prepared Rh/CeO2 contained metallic Rh as well Rh cations in higher oxidation states. At 90 K two IR bands were observed at 2183–2186 and 2161–2163 cm−1, with the former saturating first. The 2163 cm−1 peak was more sensitive to CO pressure than the 2186 cm−1. Heating resulted in the depopulation of the 2163 cm−1 before the 2186 cm−1 peak. The desorption energy computed, assuming a first-order desorption kinetic, was found to be 0.35 eV for the 2186 cm−1 and 0.30 for the 2163 cm−1 IR peak (+/−0.05 eV). The equilibrium constant at 90 K was computed equal to 1.83 and 1.33 Torr−1 for the 2183 and 2161 cm−1, respectively. CO adsorption at 90 K on Rh/CeO2 resulted (in addition to the bands on CeO2) in the appearance of a broad band in the 2110–2130 cm-1 region that contained two components at 2116 and 2126 cm−1. The high frequency of this species is most likely due to adsorption on Rh clusters with very small sizes. The desorption energy of this species was found to be equal to 0.55 eV (+/−0.05 eV). Heating the CO covered Rh/CeO2 surface accelerated the disappearance of CO species over CeO2 and resulted in the appearance of CO2 bands (at about 150 K) followed by carbonate species. At 300 K, the surface was mainly composed of carbonates.
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27
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Laser Cladding of Ti-Based Ceramic Coatings on Ti6Al4V Alloy: Effects of CeO2 Nanoparticles Additive on Wear Performance. COATINGS 2019. [DOI: 10.3390/coatings9020109] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Ti-based ceramic coatings on Ti6Al4V substrates were successfully prepared through a laser cladding process using pre-placed starting materials of TiCN + SiO2 mixed powder without or with adding a 3 wt % CeO2 nanoparticles additive, aiming at improving the wear resistance of the Ti6Al4V alloy for biological applications. The effects of the CeO2 nanoparticles additive on the microstructure, microhardness, and wear performance of the coatings were analyzed in detail. The observations showed that the main compositions of the cladding coating were TiCN and TiN phase. Compared to the coatings without CeO2, the coatings modified with CeO2 nanoparticles led to more excellent mechanical properties. The average microhardness of the coatings modified with CeO2 nanoparticles was approximately 1230 HV0.2, and the wear volume loss of the coatings modified with CeO2 nanoparticles was approximately 14% less than that of the coatings without CeO2 under a simulated body fluid (SBF) lubrication environment. The major reasons included that the microstructure of the coatings modified with CeO2 nanoparticles was refined and compact granular crystalline. The wear mechanisms of the coatings were investigated from the worn surface of the coatings, wear debris, and the worn surface of the counter-body balls. The wear mechanisms of the coatings without CeO2 included abrasive wear, adhesive wear, and fatigue wear, while the wear mechanisms of the coatings modified with CeO2 nanoparticles included only abrasive wear and adhesive wear, because the fine microstructure of the coatings had an excellent resistance to fatigue wear.
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28
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Scaranto J, Idriss H. DFT studies of bulk and surfaces of the electrocatalyst cobalt phosphide CoP2. Chem Phys Lett 2019. [DOI: 10.1016/j.cpletx.2019.100008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Brugnoli L, Ferrari AM, Civalleri B, Pedone A, Menziani MC. Assessment of Density Functional Approximations for Highly Correlated Oxides: The Case of CeO 2 and Ce 2O 3. J Chem Theory Comput 2018; 14:4914-4927. [PMID: 30096235 DOI: 10.1021/acs.jctc.8b00600] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
CeO2 based materials are very attractive as catalytic components for industrial processes and environmentally friendly technologies; therefore, a reliable and computationally affordable theoretical description of the main properties of ceria is needed. In particular, the description of the interconversion between the Ce(IV) and Ce(III) oxidation states, on which lies the main chemical features of the cerium oxide, results in quite a challenge at the Density Functional Theory level. Here, we tested several density functional approximations, spanning from GGA to hybrid (Global, Meta-Global, and Range Separated Corrected) functionals, on the structural, vibrational, electronic, and thermochemical properties of bulk CeO2 and Ce2O3. GGA and Meta-GGA xc best predict the thermochemical data, while the discrepancies increase with the introduction of the exact exchange in hybrid functionals. Overall, the Short Range Corrected and Global Hybrid functionals with a percentage of Exact Exchange between 16 and 25 give the best description of the crystal properties. Then, a group of the best performing functionals has been tested on the formation energy of an oxygen vacancy at the (111) CeO2 surface. In general, increasing the amount of exact exchange in the hybrid functionals leads to a better description of the localized Ce 4 f states, while the energy of formation of the O vacancy decreases, worsening compared to the experiment.
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Affiliation(s)
- Luca Brugnoli
- Dipartimento di Scienze Chimiche e Geologiche , Università di Modena e Reggio Emilia , Via G. Campi 103 , I-41125 Modena , Italia
| | - Anna Maria Ferrari
- Dipartimento di Chimica , Università di Torino and NIS Centre of Excellence , Via P. Giuria 7 , I-10129 Torino , Italia
| | - Bartolomeo Civalleri
- Dipartimento di Chimica , Università di Torino and NIS Centre of Excellence , Via P. Giuria 7 , I-10129 Torino , Italia
| | - Alfonso Pedone
- Dipartimento di Scienze Chimiche e Geologiche , Università di Modena e Reggio Emilia , Via G. Campi 103 , I-41125 Modena , Italia
| | - Maria Cristina Menziani
- Dipartimento di Scienze Chimiche e Geologiche , Università di Modena e Reggio Emilia , Via G. Campi 103 , I-41125 Modena , Italia
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30
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Dovesi R, Erba A, Orlando R, Zicovich‐Wilson CM, Civalleri B, Maschio L, Rérat M, Casassa S, Baima J, Salustro S, Kirtman B. Quantum‐mechanical condensed matter simulations with CRYSTAL. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2018. [DOI: 10.1002/wcms.1360] [Citation(s) in RCA: 834] [Impact Index Per Article: 139.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
| | | | | | | | | | | | - Michel Rérat
- Equipe de Chimie Physique, IPREM UMR5254Université de Pau et des Pays de l’AdourPauFrance
| | | | - Jacopo Baima
- Dipartimento di ChimicaUniversità di TorinoTorinoItaly
| | | | - Bernard Kirtman
- Department of Chemistry and BiochemistryUniversity of CaliforniaSanta Barbara, California
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Zhao Q, Kulik HJ. Where Does the Density Localize in the Solid State? Divergent Behavior for Hybrids and DFT+U. J Chem Theory Comput 2018; 14:670-683. [PMID: 29298057 DOI: 10.1021/acs.jctc.7b01061] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Approximate density functional theory (DFT) is widely used in chemistry and physics, despite delocalization errors that affect energetic and density properties. DFT+U (i.e., semilocal DFT augmented with a Hubbard U correction) and global hybrid functionals are two commonly employed practical methods to address delocalization error. Recent work demonstrated that in transition-metal complexes both methods localize density away from the metal and onto surrounding ligands, regardless of metal or ligand identity. In this work, we compare density localization trends with DFT+U and global hybrids on a diverse set of 34 transition-metal-containing solids with varying magnetic state, electron configuration and valence shell, and coordinating-atom orbital diffuseness (i.e., O, S, Se). We also study open-framework solids in which the metal is coordinated by molecular ligands, i.e., MCO3, M(OH)2, M(NCNH)2, K3M(CN)6 (M = V-Ni). As in transition-metal complexes, incorporation of Hartree-Fock exchange consistently localizes density away from the metal, but DFT+U exhibits diverging behavior, localizing density (i) onto the metal in low-spin and late transition metals and (ii) away from the metal in other cases in agreement with hybrids. To isolate the effect of the crystal environment, we extract molecular analogues from open-framework transition-metal solids and observe consistent localization of the density away from the metal in all cases with both DFT+U and hybrid exchange. These observations highlight the limited applicability of trends established for functional tuning on transition-metal complexes even to equivalent coordination environments in the solid state.
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Affiliation(s)
- Qing Zhao
- Department of Chemical Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Heather J Kulik
- Department of Chemical Engineering and ‡Department of Mechanical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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32
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Chen T, Liu D, Wu F, Wang H. Effect of CeO₂ on Microstructure and Wear Resistance of TiC Bioinert Coatings on Ti6Al4V Alloy by Laser Cladding. MATERIALS 2017; 11:ma11010058. [PMID: 29301218 PMCID: PMC5793556 DOI: 10.3390/ma11010058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 12/23/2017] [Accepted: 12/29/2017] [Indexed: 11/16/2022]
Abstract
To solve the lack of wear resistance of titanium alloys for use in biological applications, various prepared coatings on titanium alloys are often used as wear-resistant materials. In this paper, TiC bioinert coatings were fabricated on Ti6Al4V by laser cladding using mixed TiC and ZrO2 powders as the basic pre-placed materials. A certain amount of CeO2 powder was also added to the pre-placed powders to further improve the properties of the TiC coatings. The effects of CeO2 additive on the phase constituents, microstructures and wear resistance of the TiC coatings were researched in detail. Although the effect of CeO2 on the phase constituents of the coatings was slight, it had a significant effect on the microstructure and wear resistance of the coatings. The crystalline grains in the TiC coatings, observed by a scanning electron microscope (SEM), were refined due to the effect of the CeO2. With the increase of CeO2 additive content in the pre-placed powders, finer and more compact dendrites led to improvement of the micro-hardness and wear resistance of the TiC coatings. Also, 5 wt % content of CeO2 additive in the pre-placed powders was the best choice for improving the wear properties of the TiC coatings.
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Affiliation(s)
- Tao Chen
- College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
- State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China.
| | - Defu Liu
- College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
- State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China.
| | - Fan Wu
- College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
| | - Haojun Wang
- College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
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33
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Krogel JT, Kent PRC. Magnitude of pseudopotential localization errors in fixed node diffusion quantum Monte Carlo. J Chem Phys 2017; 146:244101. [DOI: 10.1063/1.4986951] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jaron T. Krogel
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P. R. C. Kent
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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34
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Structural and electronic properties of lead sulfide quantum dots from screened hybrid density functional calculations including spin–orbit coupling effects. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2085-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Zhou SS, Liu SQ. Photocatalytic reduction of CO2based on a CeO2photocatalyst loaded with imidazole fabricated N-doped graphene and Cu(ii) as cocatalysts. Photochem Photobiol Sci 2017; 16:1563-1569. [DOI: 10.1039/c7pp00211d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cocatalysts are vital for improving photocatalytic activity.
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Affiliation(s)
- Shan-Shan Zhou
- Jiangsu Key Laboratory of Environmental Functional Materials
- School of Chemistry
- Biology and Material Engineering
- Suzhou University of Science and Technology
- Suzhou 215009
| | - Shou-Qing Liu
- Jiangsu Key Laboratory of Environmental Functional Materials
- School of Chemistry
- Biology and Material Engineering
- Suzhou University of Science and Technology
- Suzhou 215009
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36
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Liu Z, Li X, Mayyas M, Koshy P, Hart JN, Sorrell CC. Growth mechanism of ceria nanorods by precipitation at room temperature and morphology-dependent photocatalytic performance. CrystEngComm 2017. [DOI: 10.1039/c7ce00922d] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ceria (CeO2) nanorods have been prepared by simple short-term precipitation at room temperature for the first time.
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Affiliation(s)
- Zhao Liu
- School of Materials Science and Engineering
- UNSW
- Sydney
- Australia
| | - Xiaojing Li
- School of Materials Science and Engineering
- UNSW
- Sydney
- Australia
| | - Mohannad Mayyas
- School of Materials Science and Engineering
- UNSW
- Sydney
- Australia
| | - Pramod Koshy
- School of Materials Science and Engineering
- UNSW
- Sydney
- Australia
| | - Judy N. Hart
- School of Materials Science and Engineering
- UNSW
- Sydney
- Australia
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37
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Penschke C, Paier J. Reduction and oxidation of Au adatoms on the CeO2(111) surface – DFT+U versus hybrid functionals. Phys Chem Chem Phys 2017; 19:12546-12558. [DOI: 10.1039/c7cp01785e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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38
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Evarestov RA, Gryaznov D, Arrigoni M, Kotomin EA, Chesnokov A, Maier J. Use of site symmetry in supercell models of defective crystals: polarons in CeO2. Phys Chem Chem Phys 2017; 19:8340-8348. [DOI: 10.1039/c6cp08582b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polarons and oxygen site symmetry in hybrid DFT calculations.
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Affiliation(s)
- R. A. Evarestov
- Department of Chemistry
- St. Petersburg State University
- St. Petersburg
- Russia
| | - D. Gryaznov
- Department of Theoretical Physics and Computer Modelling
- Institute of Solid State Physics
- University of Latvia
- Riga
- Latvia
| | - M. Arrigoni
- Department of Physical Chemistry of Solids
- Max Planck Institute for Solid State Research
- Stuttgart
- Germany
| | - E. A. Kotomin
- Department of Theoretical Physics and Computer Modelling
- Institute of Solid State Physics
- University of Latvia
- Riga
- Latvia
| | - A. Chesnokov
- Department of Theoretical Physics and Computer Modelling
- Institute of Solid State Physics
- University of Latvia
- Riga
- Latvia
| | - J. Maier
- Department of Physical Chemistry of Solids
- Max Planck Institute for Solid State Research
- Stuttgart
- Germany
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39
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Akin ST, Ard SG, Dye BE, Schaefer HF, Duncan MA. Photodissociation of Cerium Oxide Nanocluster Cations. J Phys Chem A 2016; 120:2313-9. [PMID: 27035210 DOI: 10.1021/acs.jpca.6b02052] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Cerium oxide cluster cations, CexOy(+), are produced via laser vaporization in a pulsed nozzle source and detected with time-of-flight mass spectrometry. The mass spectrum displays a strongly preferred oxide stoichiometry for each cluster with a specific number of metal atoms x, with x ≤ y. Specifically, the most prominent clusters correspond to the formula CeO(CeO2)n(+). The cluster cations are mass selected and photodissociated with a Nd:YAG laser at either 532 or 355 nm. The prominent clusters dissociate to produce smaller species also having a similar CeO(CeO2)n(+) formula, always with apparent leaving groups of (CeO2). The production of CeO(CeO2)n(+) from the dissociation of many cluster sizes establishes the relative stability of these clusters. Furthermore, the consistent loss of neutral CeO2 shows that the smallest neutral clusters adopt the same oxidation state (IV) as the most common form of bulk cerium oxide. Clusters with higher oxygen content than the CeO(CeO2)n(+) masses are present with much lower abundance. These species dissociate by the loss of O2, leaving surviving clusters with the CeO(CeO2)n(+) formula. Density functional theory calculations on these clusters suggest structures composed of stable CeO(CeO2)n(+) cores with excess oxygen bound to the surface as a superoxide unit (O2(-)).
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Affiliation(s)
- S T Akin
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - S G Ard
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - B E Dye
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States.,Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - H F Schaefer
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States.,Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - M A Duncan
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
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40
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Paier J. Hybrid Density Functionals Applied to Complex Solid Catalysts: Successes, Limitations, and Prospects. Catal Letters 2016. [DOI: 10.1007/s10562-016-1735-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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41
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Zhao J, Wang Y, Li Y, Yue X, Wang C. Phase-dependent enhancement for CO2 photocatalytic reduction over CeO2/TiO2 catalysts. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01365a] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of CeO2 can increase the activity of rutile for CO2 photoreduction under simulated sunlight irradiation because of the presence of Ti defects at the CeO2–rutile interfaces, and this is beneficial to the interfacial separation of photogenerated charge carriers.
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Affiliation(s)
- Jie Zhao
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Yun Wang
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Yingxuan Li
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Xiu Yue
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
| | - Chuanyi Wang
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics and Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Xinjiang 830011
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42
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Weck PF, Kim E. Assessing Hubbard-corrected AM05+U and PBEsol+U density functionals for strongly correlated oxides CeO2 and Ce2O3. Phys Chem Chem Phys 2016; 18:26816-26826. [DOI: 10.1039/c6cp05479j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure–property relationships of bulk CeO2 and Ce2O3 have been investigated within the DFT+U framework. AM05+U and PBEsol+U reproduce experimental crystalline parameters and properties with superior accuracy compared to conventional Hubbard-corrected exchange–correlation functionals.
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Affiliation(s)
| | - Eunja Kim
- Department of Physics and Astronomy
- University of Nevada Las Vegas
- Las Vegas
- USA
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43
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Li WQ, Goverapet Srinivasan S, Salahub DR, Heine T. Ni on the CeO2(110) and (100) surfaces: adsorption vs. substitution effects on the electronic and geometric structures and oxygen vacancies. Phys Chem Chem Phys 2016; 18:11139-49. [DOI: 10.1039/c6cp00738d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report density functional theory (DFT) calculations of the interactions of both Ni adsorbate and substitutional dopant with the ceria (110) and (100) surfaces to explain the origin of the activity of Ni/ceria catalysts.
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Affiliation(s)
- W. Q. Li
- Department of Chemistry
- Centre for Molecular Simulation and Institute for Quantum Science and Technology
- University of Calgary
- Canada
- Department of Physics and Earth Science
| | - S. Goverapet Srinivasan
- Department of Chemistry
- Centre for Molecular Simulation and Institute for Quantum Science and Technology
- University of Calgary
- Canada
| | - D. R. Salahub
- Department of Chemistry
- Centre for Molecular Simulation and Institute for Quantum Science and Technology
- University of Calgary
- Canada
| | - T. Heine
- Department of Physics and Earth Science
- Jacobs University Bremen
- 28759 Bremen
- Germany
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie
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44
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45
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Felton JA, Ray M, Waller SE, Kafader JO, Jarrold CC. CexOy– (x = 2–3) + D2O Reactions: Stoichiometric Cluster Formation from Deuteroxide Decomposition and Anti-Arrhenius Behavior. J Phys Chem A 2014; 118:9960-9. [DOI: 10.1021/jp507900d] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeremy A. Felton
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Manisha Ray
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Sarah E. Waller
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Jared O. Kafader
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Caroline Chick Jarrold
- Department of Chemistry, Indiana University, 800 East
Kirkwood Avenue, Bloomington, Indiana 47405, United States
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46
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Lu D, Liu P. Rationalization of the Hubbard U parameter in CeO(x) from first principles: unveiling the role of local structure in screening. J Chem Phys 2014; 140:084101. [PMID: 24588142 DOI: 10.1063/1.4865831] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The density functional theory (DFT)+U method has been widely employed in theoretical studies on various ceria systems to correct the delocalization bias in local and semi-local DFT functionals with moderate computational cost. We present a systematic and quantitative study, aiming to gain better understanding of the dependence of Hubbard U on the local atomic arrangement. To rationalize the Hubbard U of Ce 4f, we employed the first principles linear response method to compute Hubbard U for Ce in ceria clusters, bulks, and surfaces. We found that the Hubbard U varies in a wide range from 4.3 eV to 6.7 eV, and exhibits a strong correlation with the Ce coordination number and Ce-O bond lengths, rather than the Ce 4f valence state. The variation of the Hubbard U can be explained by the changes in the strength of local screening due to O → Ce intersite transitions.
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Affiliation(s)
- Deyu Lu
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Ping Liu
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA
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47
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Pacchioni G. First Principles Calculations on Oxide-Based Heterogeneous Catalysts and Photocatalysts: Problems and Advances. Catal Letters 2014. [DOI: 10.1007/s10562-014-1386-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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48
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Tsipis AC. DFT assessment of the spectroscopic constants and absorption spectra of neutral and charged diatomic species of group 11 and 14 elements. J Comput Chem 2014; 35:1762-77. [PMID: 25043630 DOI: 10.1002/jcc.23684] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 06/21/2014] [Accepted: 06/24/2014] [Indexed: 11/07/2022]
Abstract
The spectroscopic constants and absorption spectra of neutral and charged diatomic molecules of group 11 and 14 elements formulated as [M(2)](+/0/-) (M = Cu, Ag, Au), and [E(2)](+/0/-) (E = C, Si, Ge, Sn, Pb) have been calculated at the PBE0/Def2-QZVPP level of theory. The electronic and bonding properties of the diatomics have been analyzed by natural bond orbital analysis approach and topology analysis by the atoms in molecules method. Particular emphasis was given on the absorption spectra of the diatomic species, which were simulated by time-dependent density functional theory calculations employing the hybrid Coulomb-attenuating CAM-B3LYP density functional. The simulated absorption spectra of the [M(2)](+/0/-) (M = Cu, Ag, Au) and [E(2)](+/0/-) (E = C, Si, Ge, Sn, Pb) species are in close resemblance with the experimentally observed spectra whenever available. The neutral M(2) and E(2) diatomics strongly absorb in the ultraviolet region, given rise to UVC, UVA and in a few cases UVB absorptions. In a few cases, weak absorbion bands also occur in the visible region. The absorption bands have thoroughly been analyzed and assignments of the contributing principal electronic transitions associated to individual excitations have been made.
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Affiliation(s)
- Athanassios C Tsipis
- Laboratory of Inorganic and General Chemistry, Department of Chemistry, University of Ioannina, 451 10, Ioannina, Greece
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49
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Choi Y, Scott M, Söhnel T, Idriss H. A DFT + U computational study on stoichiometric and oxygen deficient M–CeO2 systems (M = Pd1, Rh1, Rh10, Pd10 and Rh4Pd6). Phys Chem Chem Phys 2014; 16:22588-99. [DOI: 10.1039/c4cp03366c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular and dissociative adsorption processes of ethanol on stoichiometric and O-defected CeO2(111) surfaces alone as well as in the presence of one metal atom (Pd or Rh) are studied using spin-polarized density functional theory (DFT) with the GGA + U method (Ueff = 5.0 eV).
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Affiliation(s)
| | - M. Scott
- School of Chemical Sciences
- The University of Auckland
- Auckland, New Zealand
| | - T. Söhnel
- School of Chemical Sciences
- The University of Auckland
- Auckland, New Zealand
| | - Hicham Idriss
- SABIC Center for Research and Innovation (CRI) at King Abdullah University of Science of Technology (KAUST)
- Thuwal, Saudi Arabia
- Department of Chemistry
- University College London
- London WC1H 0AJ, UK
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50
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Hygroscopic La[B5O8(OH)]NO3·2H2O: Insight into the evolution of borate fundamental building blocks. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.07.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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