1
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Herrera G, Robert A, Gonzalez S, Schoeffmann P, Tamion A, Tournus F, Bardotti L, Boisron O, Albin C, Blanchard N, Canero-Infante I, Romeo PR, Canut B, Otero E, Ohresser P, Wilhelm F, Rogalev A, Bugnet M, Le Roy D, Dupuis V. Finite size effects on the metamagnetic phase transition in a thick B2 FeRh nanocluster film. NANOSCALE 2024; 16:11679-11687. [PMID: 38856701 DOI: 10.1039/d4nr00873a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
FeRh alloys in the CsCl-type (B2) chemically ordered phase present an antiferromagnetic to ferromagnetic order transition around 370 K observed in bulk and continuous films but absent in nanoclusters. In this study, we investigate the thermal magnetic behavior of a thick film composed of assembled FeRh nanoclusters preformed in the gas phase. This work reveals a broad and asymmetric metamagnetic transition with a consequent residual magnetization at low temperature. Due to the coexistence of different grain sizes in the sample, we confront the results with a description that involves two populations of B2-FeRh particles, and the existence of a discriminating size below which the magnetic order transition does not take place.
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Affiliation(s)
- Guillermo Herrera
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Anthony Robert
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Sara Gonzalez
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | | | - Alexandre Tamion
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Florent Tournus
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Laurent Bardotti
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Olivier Boisron
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Clément Albin
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Nicholas Blanchard
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Ingrid Canero-Infante
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Pedro Rojo Romeo
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Bruno Canut
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme de Merisiers, 91190 Saint-Aubin, France
| | | | - Fabrice Wilhelm
- European Synchrotron Radiation Facility, CS 40220, F-38043 Grenoble, France
| | - Andrei Rogalev
- European Synchrotron Radiation Facility, CS 40220, F-38043 Grenoble, France
| | - Matthieu Bugnet
- CNRS, INSA Lyon, Université Claude Bernard Lyon 1, MATEIS, UMR5510, F-69621 Villeurbanne, France
| | - Damien Le Roy
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Véronique Dupuis
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
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2
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de Souza Caldas L, Prieto MJ, Tănase LC, Tiwari A, Schmidt T, Roldan Cuenya B. Correlative In Situ Spectro-Microscopy of Supported Single CuO Nanoparticles: Unveiling the Relationships between Morphology and Chemical State during Thermal Reduction. ACS NANO 2024; 18:13714-13725. [PMID: 38741386 PMCID: PMC11140838 DOI: 10.1021/acsnano.4c01460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 04/17/2024] [Accepted: 04/29/2024] [Indexed: 05/16/2024]
Abstract
The activity, selectivity, and lifetime of nanocatalysts critically depend on parameters such as their morphology, support, chemical composition, and oxidation state. Thus, correlating these parameters with their final catalytic properties is essential. However, heterogeneity across nanoparticles (NPs) is generally expected. Moreover, their nature can also change during catalytic reactions. Therefore, investigating these catalysts in situ at the single-particle level provides insights into how these tunable parameters affect their efficiency. To unravel this question, we applied spectro-microscopy to investigate the thermal reduction of SiO2-supported copper oxide NPs in ultrahigh vacuum. Copper was selected since its oxidation state and morphological transformations strongly impact the product selectivity of many catalytic reactions. Here, the evolution of the NPs' chemical state was monitored in situ during annealing and correlated with their morphology in situ. A reaction front was observed during the reduction of CuO to Cu2O. From the temperature dependence of this front, the activation energy was extracted. Two parameters were found to strongly influence the NP reduction: the initial nanoparticle size and the chemical state of the SiO2. substrate. The CuOx reduction was found to be completed first on smaller NPs and was also favored over partially reduced SiOx regions that resulted from X-ray beam irradiation. This methodology with single-particle level spectro-microscopy resolution provides a way of isolating the influence of diverse morphologic, electronic, and chemical influences on a chemical reaction. The knowledge gained is crucial for the future design of more complex multimetallic catalytic systems.
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Affiliation(s)
- Lucas de Souza Caldas
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
| | - Mauricio J. Prieto
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
| | - Liviu C. Tănase
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
| | - Aarti Tiwari
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
| | - Thomas Schmidt
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz-Haber Institute of the Max-Planck Society, Berlin 14195, Germany
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3
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Pei C, Chen S, Fu D, Zhao ZJ, Gong J. Structured Catalysts and Catalytic Processes: Transport and Reaction Perspectives. Chem Rev 2024; 124:2955-3012. [PMID: 38478971 DOI: 10.1021/acs.chemrev.3c00081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
The structure of catalysts determines the performance of catalytic processes. Intrinsically, the electronic and geometric structures influence the interaction between active species and the surface of the catalyst, which subsequently regulates the adsorption, reaction, and desorption behaviors. In recent decades, the development of catalysts with complex structures, including bulk, interfacial, encapsulated, and atomically dispersed structures, can potentially affect the electronic and geometric structures of catalysts and lead to further control of the transport and reaction of molecules. This review describes comprehensive understandings on the influence of electronic and geometric properties and complex catalyst structures on the performance of relevant heterogeneous catalytic processes, especially for the transport and reaction over structured catalysts for the conversions of light alkanes and small molecules. The recent research progress of the electronic and geometric properties over the active sites, specifically for theoretical descriptors developed in the recent decades, is discussed at the atomic level. The designs and properties of catalysts with specific structures are summarized. The transport phenomena and reactions over structured catalysts for the conversions of light alkanes and small molecules are analyzed. At the end of this review, we present our perspectives on the challenges for the further development of structured catalysts and heterogeneous catalytic processes.
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Affiliation(s)
- Chunlei Pei
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Sai Chen
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Donglong Fu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Zhi-Jian Zhao
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Jinlong Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- National Industry-Education Platform of Energy Storage, Tianjin University, 135 Yaguan Road, Tianjin 300350, China
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4
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Maeda R, Sampei H, Nakayama R, Higo T, Koshizuka Y, Bando Y, Komanoya T, Nakahara Y, Sekine Y. Effect of CeO 2 support structure on the catalytic performance of ammonia synthesis in an electric field at low temperatures. RSC Adv 2024; 14:9869-9877. [PMID: 38528930 PMCID: PMC10962022 DOI: 10.1039/d4ra01457j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Accepted: 03/15/2024] [Indexed: 03/27/2024] Open
Abstract
Ammonia is an extremely important storage and transport medium for renewable energy, and technology is expected to produce it on demand and onsite using renewable energy. Applying a DC (direct current) to a solid catalyst layer with semiconducting properties makes ammonia synthesis highly efficient, even at low temperatures (approximately 400 K). In this process, oxide supports with semiconducting properties play important roles as metal supports and conduction fields for electrons and protons. The influence of the degree of particle aggregation on the support properties and ammonia synthesis using an electric field was evaluated for CeO2, which is the best material for this purpose because of its semiconducting properties. The results showed that controlling the aggregation structure of the crystalline particles could significantly influence the surface conductivity of protons and electrons; thus, the activity could be largely controlled. The Ru-CeO2 interaction could also be controlled by changing the crystallinity, which suppressed the aggregation of the supported Ru and significantly improved the ammonia synthesis activity using an electric field at low temperatures.
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Affiliation(s)
- Ryuku Maeda
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
| | - Hiroshi Sampei
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
| | - Reika Nakayama
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
| | - Takuma Higo
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
| | - Yoshiki Koshizuka
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
| | - Yoshiro Bando
- Mitsui Mining and Smelting Co. Ltd 1333-2, Haraichi, Ageo 362-0021 Saitama Japan
| | - Tasuku Komanoya
- Mitsui Mining and Smelting Co. Ltd 1333-2, Haraichi, Ageo 362-0021 Saitama Japan
| | - Yunosuke Nakahara
- Mitsui Mining and Smelting Co. Ltd 1333-2, Haraichi, Ageo 362-0021 Saitama Japan
| | - Yasushi Sekine
- Department of Applied Chemistry, Waseda University 3-4-1, Okubo, Shinjuku 169-8555 Tokyo Japan
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5
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Sojková T, Gröger R, Poloprudský J, Kuběna I, Schneeweiss O, Sojka M, Šiška Z, Pongrácz J, Pizúrová N. Kinetics of spontaneous phase transitions from wüstite to magnetite in superparamagnetic core-shell nanocubes of iron oxides. NANOSCALE 2024. [PMID: 38380646 DOI: 10.1039/d3nr06254f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
Iron oxide nanoparticles with a wüstite structure have been prepared by thermal decomposition. In air, they undergo a spontaneous transition into a thermodynamically more stable magnetite structure that grows from the surface. The thickness of this magnetite shell increases with time, thereby producing a series of core-shell nanoparticles. We investigated the kinetics of this phase transition in 23 nm nanocubes using time-resolved XRD, from which the fractions of individual phases were determined by the Rietveld refinement. This kinetics is described theoretically using three coupled reaction-diffusion master equations for the concentrations of oxygen, wüstite, and magnetite, in which both the diffusion of oxygen and its reaction with wüstite are thermally activated. The coefficients of these terms were adjusted so that the predictions of the model reproduce the XRD data at 298 K and 353 K, whereas the predictive capability of the model was assessed by comparing its predictions with measurements at 403 K.
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Affiliation(s)
- Tereza Sojková
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
- Central European Institute of Technology (CEITEC), Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic
| | - Roman Gröger
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
| | - Jakub Poloprudský
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
| | - Ivo Kuběna
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
| | - Oldřich Schneeweiss
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
| | - Martin Sojka
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
| | - Zuzana Šiška
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
- Central European Institute of Technology (CEITEC), Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic
| | - Jakub Pongrácz
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
- Central European Institute of Technology (CEITEC), Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic
| | - Naděžda Pizúrová
- Institute of Physics of Materials and CEITEC IPM, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech Republic.
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6
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Lavorato GC, de Almeida AA, Vericat C, Fonticelli MH. Redox phase transformations in magnetite nanoparticles: impact on their composition, structure and biomedical applications. NANOTECHNOLOGY 2023; 34:192001. [PMID: 36825776 DOI: 10.1088/1361-6528/acb943] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
Magnetite nanoparticles (NPs) are one of the most investigated nanomaterials so far and modern synthesis methods currently provide an exceptional control of their size, shape, crystallinity and surface functionalization. These advances have enabled their use in different fields ranging from environmental applications to biomedicine. However, several studies have shown that the precise composition and crystal structure of magnetite NPs depend on their redox phase transformations, which have a profound impact on their physicochemical properties and, ultimately, on their technological applications. Although the physical mechanisms behind such chemical transformations in bulk materials have been known for a long time, experiments on NPs with large surface-to-volume ratios have revealed intriguing results. This article is focused on reviewing the current status of the field. Following an introduction on the fundamental properties of magnetite and other related iron oxides (including maghemite and wüstite), some basic concepts on the chemical routes to prepare iron oxide nanomaterials are presented. The key experimental techniques available to study phase transformations in iron oxides, their advantages and drawbacks to the study of nanomaterials are then discussed. The major section of this work is devoted to the topotactic oxidation of magnetite NPs and, in this regard, the cation diffusion model that accounts for the experimental results on the kinetics of the process is critically examined. Since many synthesis routes rely on the formation of monodisperse magnetite NPs via oxidation of wüstite counterparts, the modulation of their physical properties by crystal defects arising from the oxidation process is also described. Finally, the importance of a precise control of the composition and structure of magnetite-based NPs is discussed and its role in their biomedical applications is highlighted.
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Affiliation(s)
- Gabriel C Lavorato
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 16, Suc. 4, 1900 La Plata, Argentina
| | - Adriele A de Almeida
- Instituto de Física 'Gleb Wataghin' (IFGW), Universidade Estadual de Campinas-UNICAMP, R. Sérgio Buarque de Holanda, 777-CEP: 13083-859, Campinas - SP, Brazil
| | - Carolina Vericat
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 16, Suc. 4, 1900 La Plata, Argentina
| | - Mariano H Fonticelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C. C. 16, Suc. 4, 1900 La Plata, Argentina
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7
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Vijayakumar J, Savchenko TM, Bracher DM, Lumbeeck G, Béché A, Verbeeck J, Vajda Š, Nolting F, Vaz C, Kleibert A. Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles. Nat Commun 2023; 14:174. [PMID: 36635276 PMCID: PMC9837083 DOI: 10.1038/s41467-023-35846-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 01/04/2023] [Indexed: 01/13/2023] Open
Abstract
Understanding chemical reactivity and magnetism of 3d transition metal nanoparticles is of fundamental interest for applications in fields ranging from spintronics to catalysis. Here, we present an atomistic picture of the early stage of the oxidation mechanism and its impact on the magnetism of Co nanoparticles. Our experiments reveal a two-step process characterized by (i) the initial formation of small CoO crystallites across the nanoparticle surface, until their coalescence leads to structural completion of the oxide shell passivating the metallic core; (ii) progressive conversion of the CoO shell to Co3O4 and void formation due to the nanoscale Kirkendall effect. The Co nanoparticles remain highly reactive toward oxygen during phase (i), demonstrating the absence of a pressure gap whereby a low reactivity at low pressures is postulated. Our results provide an important benchmark for the development of theoretical models for the chemical reactivity in catalysis and magnetism during metal oxidation at the nanoscale.
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Affiliation(s)
- Jaianth Vijayakumar
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Tatiana M. Savchenko
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - David M. Bracher
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Gunnar Lumbeeck
- grid.5284.b0000 0001 0790 3681EMAT, University of Antwerp, 2020 Antwerpen, Belgium
| | - Armand Béché
- grid.5284.b0000 0001 0790 3681EMAT, University of Antwerp, 2020 Antwerpen, Belgium
| | - Jo Verbeeck
- grid.5284.b0000 0001 0790 3681EMAT, University of Antwerp, 2020 Antwerpen, Belgium
| | - Štefan Vajda
- grid.418095.10000 0001 1015 3316Department of Nanocatalysis, J. Heyrovský Institute of Physical Chemistry v.v.i., Czech Academy of Sciences, Dolejškova 2155/3, 18223 Prague, Czech Republic
| | - Frithjof Nolting
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - C.A.F. Vaz
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Armin Kleibert
- grid.5991.40000 0001 1090 7501Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
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8
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McDougall H, Hibberd M, Tong A, Neville S, Peterson V, Didier C. Preparation of pyrite concentrate powder from the Thackaringa mine for quantitative phase analysis using X-ray diffraction. J Appl Crystallogr 2022; 55:1572-1582. [PMID: 36570660 PMCID: PMC9721321 DOI: 10.1107/s1600576722009888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 10/10/2022] [Indexed: 12/02/2022] Open
Abstract
The quantitative phase analysis using X-ray diffraction of pyrite ore concentrate samples extracted from the Thackaringa mine is problematic due to poor particle statistics, microabsorption and preferred orientation. The influence of sample preparation on these issues has been evaluated, with ball milling of the powder found most suitable for accurate and precise quantitative phase analysis. The milling duration and other aspects of sample preparation have been explored, resulting in accurate phase reflection intensities when particle sizes are below 5 µm. Quantitative phase analysis on those samples yielded precise phase fractions with standard deviations below 0.3 wt%. Some discrepancy between the elemental composition obtained using X-ray powder diffraction data and that determined using wavelength-dispersive X-ray fluorescence was found, and is thought to arise from unaccounted for crystalline phase substitution and the possible presence of an amorphous phase. This study provides a methodology for the precise and accurate quantitative phase analysis of X-ray powder diffraction data of pyrite ore concentrate from the Thackaringa mine and a discussion of the limitations of the method. The optimization process reveals the importance of confirming reproducibility on new samples, with as much prior knowledge as possible.
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Affiliation(s)
- Hamish McDougall
- School of Chemistry, The University of New South Wales, Anzac Parade, Sydney, NSW 2052, Australia,Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Sydney, NSW 2232, Australia
| | - Monica Hibberd
- School of Chemistry, The University of New South Wales, Anzac Parade, Sydney, NSW 2052, Australia,Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Sydney, NSW 2232, Australia
| | - Andrew Tong
- Cobalt Blue, 17.03 100 Miller Street, North Sydney, NSW 2060, Australia
| | - Suzanne Neville
- School of Chemistry, The University of New South Wales, Anzac Parade, Sydney, NSW 2052, Australia,Correspondence e-mail: , ,
| | - Vanessa Peterson
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Sydney, NSW 2232, Australia,Correspondence e-mail: , ,
| | - Christophe Didier
- School of Chemistry, The University of New South Wales, Anzac Parade, Sydney, NSW 2052, Australia,Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Sydney, NSW 2232, Australia,Correspondence e-mail: , ,
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9
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Duong HTK, Abdibastami A, Gloag L, Barrera L, Gooding JJ, Tilley RD. A guide to the design of magnetic particle imaging tracers for biomedical applications. NANOSCALE 2022; 14:13890-13914. [PMID: 36004758 DOI: 10.1039/d2nr01897g] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Magnetic Particle Imaging (MPI) is a novel and emerging non-invasive technique that promises to deliver high quality images, no radiation, high depth penetration and nearly no background from tissues. Signal intensity and spatial resolution in MPI are heavily dependent on the properties of tracers. Hence the selection of these nanoparticles for various applications in MPI must be carefully considered to achieve optimum results. In this review, we will provide an overview of the principle of MPI and the key criteria that are required for tracers in order to generate the best signals. Nanoparticle materials such as magnetite, metal ferrites, maghemite, zero valent iron@iron oxide core@shell, iron carbide and iron-cobalt alloy nanoparticles will be discussed as well as their synthetic pathways. Since surface modifications play an important role in enabling the use of these tracers for biomedical applications, coating options including the transfer from organic to inorganic media will also be discussed. Finally, we will discuss different biomedical applications and provide our insights into the most suitable tracer for each of these applications.
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Affiliation(s)
- H T Kim Duong
- School of Chemistry, UNSW Sydney, NSW 2052, Australia.
| | | | - Lucy Gloag
- School of Chemistry, UNSW Sydney, NSW 2052, Australia.
| | - Liam Barrera
- School of Chemistry, UNSW Sydney, NSW 2052, Australia.
| | - J Justin Gooding
- School of Chemistry, UNSW Sydney, NSW 2052, Australia.
- Australian Centre for NanoMedicine, University of New South Wales, NSW 2052, Australia
| | - Richard D Tilley
- School of Chemistry, UNSW Sydney, NSW 2052, Australia.
- Electron Microscope Unit, Mark Wainwright Analytical Centre, University of New South Wales, NSW 2052, Australia
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10
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Vikanova KV, Redina EA, Kustov LM. Hydrogen spillover on cerium-based catalysts. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3567-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Vadchenko SG, Alymov MI. Change in the Ignition Parameters of Nanodispersed Iron Powders During Long-Term Storage. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793122020130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Fatimah I, Fadillah G, Yanti I, Doong RA. Clay-Supported Metal Oxide Nanoparticles in Catalytic Advanced Oxidation Processes: A Review. NANOMATERIALS 2022; 12:nano12050825. [PMID: 35269318 PMCID: PMC8912419 DOI: 10.3390/nano12050825] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 02/22/2022] [Accepted: 02/27/2022] [Indexed: 11/29/2022]
Abstract
Advanced oxidation processes (AOPs) utilizing heterogeneous catalysts have attracted great attention in the last decade. The use of solid catalysts, including metal and metal oxide nanoparticle support materials, exhibited better performance compared with the use of homogeneous catalysts, which is mainly related to their stability in hostile environments and recyclability and reusability. Various solid supports have been reported to enhance the performance of metal and metal oxide catalysts for AOPs; undoubtedly, the utilization of clay as a support is the priority under consideration and has received intensive interest. This review provides up-to-date progress on the synthesis, features, and future perspectives of clay-supported metal and metal oxide for AOPs. The methods and characteristics of metal and metal oxide incorporated into the clay structure are strongly influenced by various factors in the synthesis, including the kind of clay mineral. In addition, the benefits of nanomaterials from a green chemistry perspective are key aspects for their further considerations in various applications. Special emphasis is given to the basic schemes for clay modifications and role of clay supports for the enhanced mechanism of AOPs. The scaling-up issue is suggested for being studied to further applications at industrial scale.
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Affiliation(s)
- Is Fatimah
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Kampus Terpadu UII, Jl. Kaliurang Km 14, Yogyakarta 55112, Indonesia; (G.F.); (I.Y.)
- Correspondence: (I.F.); (R.-a.D.)
| | - Ganjar Fadillah
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Kampus Terpadu UII, Jl. Kaliurang Km 14, Yogyakarta 55112, Indonesia; (G.F.); (I.Y.)
| | - Ika Yanti
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Islam Indonesia, Kampus Terpadu UII, Jl. Kaliurang Km 14, Yogyakarta 55112, Indonesia; (G.F.); (I.Y.)
| | - Ruey-an Doong
- Institute of Analytical and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan
- Correspondence: (I.F.); (R.-a.D.)
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13
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Alonso JA, López MJ. Palladium clusters, free and supported on surfaces, and their applications in hydrogen storage. Phys Chem Chem Phys 2022; 24:2729-2751. [PMID: 35077528 DOI: 10.1039/d1cp03524j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Palladium is a late transition metal element in the 4d row of the periodic table. Palladium nanoparticles show efficient catalytic activity and selectivity in a number of chemical reactions. In this paper, we review the structural and electronic properties of palladium nanoclusters, both isolated and deposited on the surface of different substrates. Careful experiments and extensive calculations have been performed for small Pd clusters which provide ample information on their properties. Work on large Pd clusters is less abundant and more difficult to perform and interpret. Cluster deposition is a method to modify material surfaces for different applications, and we report the known results for the deposition of Pd clusters on the surfaces of a number of interesting substrates: carbonaceous substrates like graphene and some layered novel materials related to graphene, metal oxide substrates, silicon and silicon-related substrates and metallic alloy substrates. Emphasis is placed on revealing how the structural, electronic and magnetic properties change when the clusters are deposited on the substrate surfaces. Some examples of chemical reactions catalyzed by supported Pd clusters and nanoparticles are reported. An issue discussed in detail is the influence of Pd on the storage of hydrogen in porous materials. Experimental work shows that the amount of stored hydrogen increases when the absorbing material is doped with Pd atoms, clusters and nanoparticles, and a spillover mechanism from the metal particle to the substrate is usually accepted as the explanation. To shed light on this issue, a critical analysis based on density functional simulations of the mechanisms of hydrogen spillover in perfect and defective graphene doped with palladium clusters is presented.
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Affiliation(s)
- Julio A Alonso
- Departamento de Física Teórica, Atómica y Optica, Universidad de Valladolid, 47011, Valladolid, Spain.
| | - María J López
- Departamento de Física Teórica, Atómica y Optica, Universidad de Valladolid, 47011, Valladolid, Spain.
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14
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Ting LRL, Peng Y, Yeo BS. Mechanistic Insights into the Selective Electroreduction of Crotonaldehyde to Crotyl Alcohol and 1-Butanol. CHEMSUSCHEM 2021; 14:2963-2971. [PMID: 34018321 DOI: 10.1002/cssc.202100513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 05/20/2021] [Indexed: 06/12/2023]
Abstract
The electroreduction of crotonaldehyde, which can be derived from the aldol condensation of acetaldehyde (sustainably produced from CO2 reduction or from biomass ethanol), is potentially a carbon-neutral route for generating high-value C4 chemicals such as crotyl alcohol and 1-butanol. Developing functional catalysts is necessary toward this end. Herein, the electrocatalytic conversion of crotonaldehyde to crotyl alcohol and 1-butanol was achieved in 0.1 m potassium phosphate buffer electrolyte (pH=7). More importantly, the mechanisms and structure-activity relationships of these transformations were elucidated. Crotyl alcohol was formed on oxide-derived Ag at -0.75 V versus the reversible hydrogen electrode (RHE) with a faradaic efficiency (FE) of 84.3 % (reactant conversion after 75 min electrolysis=9.8 %), which is 1.6 times higher than that on polished Ag foils. The coordinatively-unsaturated sites on oxide-derived Ag surfaces were proposed to facilitate crotonaldehyde adsorption via its oxygen atom in order to promote crotyl alcohol formation. On electrodeposited Fe nanoflakes, crotonaldehyde could be reduced to 1-butanol with an outstanding FE of 60.6 % (reactant conversion after 75 min electrolysis=9.4 %) at -0.70 V vs. RHE. This is nearly 3 times higher than the FE of 1-butanol observed on polished Fe foils at the same potential. More strikingly, the corresponding partial current density of 1-butanol was -9.19 mA cm-2 , which is 43 times higher than that on Fe foils. The presence of tensile strains and grain boundaries on the Fe nanoflakes were elucidated and suggested to activate a concerted reduction of the C=O and C=C bonds in crotonaldehyde to produce 1-butanol selectively.
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Affiliation(s)
- Louisa Rui Lin Ting
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
- Solar Energy Research Institute of Singapore, National University of Singapore, 7 Engineering Drive 1, Singapore, 117574, Singapore
| | - Yujie Peng
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Boon Siang Yeo
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
- Solar Energy Research Institute of Singapore, National University of Singapore, 7 Engineering Drive 1, Singapore, 117574, Singapore
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15
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Lopez Luna M, Timoshenko J, Kordus D, Rettenmaier C, Chee SW, Hoffman AS, Bare SR, Shaikhutdinov S, Roldan Cuenya B. Role of the Oxide Support on the Structural and Chemical Evolution of Fe Catalysts during the Hydrogenation of CO 2. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01549] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Mauricio Lopez Luna
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Janis Timoshenko
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - David Kordus
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Clara Rettenmaier
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - See Wee Chee
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Adam S. Hoffman
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Simon R. Bare
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Shamil Shaikhutdinov
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany
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16
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Peeters E, Pomalaza G, Khalil I, Detaille A, Debecker DP, Douvalis AP, Dusselier M, Sels BF. Highly Dispersed Sn-beta Zeolites as Active Catalysts for Baeyer–Villiger Oxidation: The Role of Mobile, In Situ Sn(II)O Species in Solid-State Stannation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00435] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elise Peeters
- Centre for Sustainable Catalysis and Engineering (CSCE), Leuven Chem&Tech, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Guillaume Pomalaza
- Centre for Sustainable Catalysis and Engineering (CSCE), Leuven Chem&Tech, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Ibrahim Khalil
- Centre for Sustainable Catalysis and Engineering (CSCE), Leuven Chem&Tech, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Arnaud Detaille
- Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCLouvain), Place Louis Pasteur 1, Box L4.01.09, 1348 Louvain-La-Neuve, Belgium
| | - Damien P. Debecker
- Institute of Condensed Matter and Nanosciences (IMCN), Université catholique de Louvain (UCLouvain), Place Louis Pasteur 1, Box L4.01.09, 1348 Louvain-La-Neuve, Belgium
| | - Alexios P. Douvalis
- Mössbauer Spectroscopy & Physics of Materials Laboratory, Department of Physics, University of Ioannina, 45110 Ioannina, Greece
- Institute of Materials Science and Computing, University Research Center of Ioannina (URCI), 45110 Ioannina, Greece
| | - Michiel Dusselier
- Centre for Sustainable Catalysis and Engineering (CSCE), Leuven Chem&Tech, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
| | - Bert F. Sels
- Centre for Sustainable Catalysis and Engineering (CSCE), Leuven Chem&Tech, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
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17
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Abstract
Electrochemical reduction of CO2 to value-added chemicals and fuels is a promising approach to store renewable energy while closing the anthropogenic carbon cycle. Despite significant advances in developing new electrocatalysts, this system still lacks enough energy conversion efficiency to become a viable technology for industrial applications. To develop an active and selective electrocatalyst and engineer the reaction environment to achieve high energy conversion efficiency, we need to improve our knowledge of the reaction mechanism and material structure under reaction conditions. In situ spectroscopies are among the most powerful tools which enable measurements of the system under real conditions. These methods provide information about reaction intermediates and possible reaction pathways, electrocatalyst structure and active sites, as well as the effect of the reaction environment on products distribution. This review aims to highlight the utilization of in situ spectroscopic methods that enhance our understanding of the CO2 reduction reaction. Infrared, Raman, X-ray absorption, X-ray photoelectron, and mass spectroscopies are discussed here. The critical challenges associated with current state-of-the-art systems are identified and insights on emerging prospects are discussed.
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18
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V VM, Nageswaran G. Operando X-Ray Spectroscopic Techniques: A Focus on Hydrogen and Oxygen Evolution Reactions. Front Chem 2020; 8:23. [PMID: 32083053 PMCID: PMC7002430 DOI: 10.3389/fchem.2020.00023] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/09/2020] [Indexed: 11/22/2022] Open
Abstract
The study of structural as well as chemical properties of an electrocatalyst in its reaction environment is a challenge in electrocatalysis. This is very important for the better understanding of the dynamic changes in the reactivity with respect to the structure of catalysts to give insight into the reaction mechanism. The in situ/operando investigation of electrode/electrolyte interface has been increasingly explored in recent days due to the significant developments in technology. The review focus on operando X-ray spectroscopic techniques to understand the behavior of electrocatalysts in hydrogen evolution and oxygen evolution reactions (HER and OER). Some recent studies on the application of operando X-ray spectroscopic methods to study the dynamic nature as well as the evaluation of structural and chemical changes of the electrocatalysts for HER and OER in different reaction environment are discussed.
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Affiliation(s)
- Varsha M V
- Indian Institute of Space Science and Technology, Thiruvananthapuram, India
| | - Gomathi Nageswaran
- Indian Institute of Space Science and Technology, Thiruvananthapuram, India
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19
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Murakami K, Sekine Y. Recent progress in use and observation of surface hydrogen migration over metal oxides. Phys Chem Chem Phys 2020; 22:22852-22863. [PMID: 33033817 DOI: 10.1039/d0cp04139d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrogen migration over a metal oxide surface is an extremely important factor governing the activity and selectivity of various heterogeneous catalytic reactions. Passive migration of hydrogen governed by a concentration gradient is called hydrogen spillover, which has been investigated broadly for a long time. Recently, well-fabricated samples and state-of-the-art measurement techniques such as operando spectroscopy and electrochemical analysis have been developed, yielding findings that have elucidated the migration mechanism and novel utilisation of hydrogen spillover. Furthermore, great attention has been devoted to surface protonics, which is hydrogen migration activated by an electric field, as applicable for novel low-temperature catalysis. This article presents an overview of catalysis related to hydrogen hopping, sophisticated analysis techniques for hydrogen migration, and low-temperature catalysis using surface protonics.
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Affiliation(s)
- Kota Murakami
- Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, Japan.
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20
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Orel VE, Tselepi M, Mitrelias T, Zabolotny M, Shevchenko A, Rykhalskyi A, Romanov A, Orel VB, Burlaka A, Lukin S, Kyiashko V, Barnes CHW. The comparison between superparamagnetic and ferromagnetic iron oxide nanoparticles for cancer nanotherapy in the magnetic resonance system. NANOTECHNOLOGY 2019; 30:415701. [PMID: 31265997 DOI: 10.1088/1361-6528/ab2ea7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The paper aims to compare zeta potentials, magnetic properties, electron spin resonance, photoluminescence (PL) spectra and antitumor effect of magneto-mechano-chemically synthesized magneto-sensitive nanocomplexes loaded with the anticancer drug doxorubicin (DOXO) during nanotherapy of Walker-256 carcinosarcoma carried out by a magnetic resonance system. Diamagnetic DOXO acquired the properties of a paramagnetic substance after synthesis. MNC comprising superparamagnetic nanoparticles (NP) and DOXO had different g-factors, zeta potentials, a lower saturation magnetic moment, area of the hysteresis loop, and a higher coercivity compared to similar MNC with ferromagnetic NP. The main PL peak of MNC spectrum was defined by DOXO at 598 nm. MNC composed of superparamagnetic NP and DOXO showed a lower standard deviation of the normal PL spectral distribution than MNC based on ferromagnetic NP in relation to conventional DOXO. MNC containing superparamagnetic NP responded to resonance conditions leading to a more pronounced antitumor effect compared to MNC with ferromagnetic NP in the course of magnetic nanotherapy for Walker-256 carcinosarcoma bearing animals (temperature inside the tumor did not exceed 40 °C). Therefore, these findings are associated with differences in chemotherapeutic effect between MNC due to a different surface charge and conformational changes in DOXO molecules during its magnetoelectric interaction with single- and multidomain NP.
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Affiliation(s)
- Valerii E Orel
- National Cancer Institute, 33/43 Lomonosov St., 03022, Kyiv, Ukraine. Biomedical Engineering Department, NTUU 'Igor Sikorsky KPI', Kyiv, Ukraine
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21
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Decarolis D, Odarchenko Y, Herbert JJ, Qiu C, Longo A, Beale AM. Identification of the key steps in the self-assembly of homogeneous gold metal nanoparticles produced using inverse micelles. Phys Chem Chem Phys 2019; 22:18824-18834. [PMID: 31475258 DOI: 10.1039/c9cp03473k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The self-assembly of gold nanoparticles (Au NPs) using polymer-encapsulated inverse micelles was studied using a set of advanced X-ray techniques (i.e. XAFS, SAXS) in addition to DLS, UV-vis spectroscopy and TEM. Importantly the combination of these techniques with the inverse micelle approach affords us detailed insight and to rationalize the evolving molecular chemistry and how this drives the formation of the Au NPs. We observe that the mechanism comprises three key steps: an initial fast reduction of molecular Au(iii) species to molecular Au(i)Cl; the latter species are often very unstable during the self-assembly process. This is followed by a gradual reduction of these molecular Au(i) species and the formation of sub-nanometric Au clusters which coalesce into nanoparticles. It was also found that addition of small amounts of HCl can accelerate the formation of the Au clusters (the second phase) without affecting the final particle size or its particle size distribution. These findings would help us to understand the reaction mechanism of Au NP formation as well as providing insights into how NP properties could be further tailored for a wide range of practical applications.
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Affiliation(s)
- Donato Decarolis
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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22
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Liu S, Arce AS, Nilsson S, Albinsson D, Hellberg L, Alekseeva S, Langhammer C. In Situ Plasmonic Nanospectroscopy of the CO Oxidation Reaction over Single Pt Nanoparticles. ACS NANO 2019; 13:6090-6100. [PMID: 31091069 PMCID: PMC6566494 DOI: 10.1021/acsnano.9b02876] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Accepted: 05/15/2019] [Indexed: 05/10/2023]
Abstract
The ongoing quest to develop single-particle methods for the in situ study of heterogeneous catalysts is driven by the fact that heterogeneity in terms of size, shape, grain structure, and composition is a general feature among nanoparticles in an ensemble. This heterogeneity hampers the generation of a deeper understanding for how these parameters affect catalytic properties. Here we present a solution that in a single benchtop experimental setup combines single-particle plasmonic nanospectroscopy with mass spectrometry for gas phase catalysis under reaction conditions at high temperature. We measure changes in the surface state of polycrystalline platinum model catalyst particles in the 70 nm size range and the corresponding bistable kinetics during the carbon monoxide oxidation reaction via the peak shift of the dark-field scattering spectrum of a closely adjacent plasmonic nanoantenna sensor and compare these changes with the total reaction rate measured by the mass spectrometer from an ensemble of nominally identical particles. We find that the reaction kinetics of simultaneously measured individual Pt model catalysts are dictated by the grain structure and that the superposition of the individual nanoparticle response can account for the significant broadening observed in the corresponding nanoparticle ensemble data. In a wider perspective our work enables in situ plasmonic nanospectroscopy in controlled gas environments at high temperature to investigate the role of the surface state on transition metal catalysts during reaction and of processes such as alloying or surface segregation in situ at the single-nanoparticle level for model catalysts in the few tens to hundreds of nanometer size range.
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Affiliation(s)
- Su Liu
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - Arturo Susarrey Arce
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - Sara Nilsson
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - David Albinsson
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - Lars Hellberg
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - Svetlana Alekseeva
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
| | - Christoph Langhammer
- Department of Physics, Chalmers
University of Technology, 412 96 Göteborg, Sweden
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23
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Suhito IR, Kang ES, Kim DS, Baek S, Park SJ, Moon SH, Luo Z, Lee D, Min J, Kim TH. High density gold nanostructure composites for precise electrochemical detection of human embryonic stem cells in cell mixture. Colloids Surf B Biointerfaces 2019; 180:384-392. [PMID: 31082776 DOI: 10.1016/j.colsurfb.2019.04.059] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 04/18/2019] [Accepted: 04/29/2019] [Indexed: 01/10/2023]
Abstract
Precise detection of undifferentiated human pluripotent stem cells (hPSCs) and their entire subsequent elimination are incredibly important in preventing teratoma formations after transplantation. Recently, electrochemical sensing platforms have demonstrated immense potential as a new tool to detect remaining hPSCs in label-free and non-destructive manner. Nevertheless, one of the critical huddles of this electrochemical sensing approach is its low sensitivity since even low concentrations of remaining hPSCs were reported to form teratoma once transplanted. To address this issue, in this study, we report an engineering-based approach to improve the sensitivity of electrochemical sensing platform for hPSC detection. By optimizing the density of gold nanostructure and the matrigel concentration to improve both electro-catalytic property and biocompatibility, the sensitivity of the developed platform toward hESCs detection could reach 12,500 cells/chip, which is close to the known critical concentration of hPSCs (˜10,000 cells) that induce teratoma formation in vivo. Remarkably, the electrochemical signals were not detectable from other types of stem cell-derived endothelial cells (CB-EPCs) even at high concentrations of CB-EPCs (40,000 cells/chip), proving the high selectivity of the developed platform toward hPSC detection. Hence, the developed platform could be highly useful to solve the safety issues that are related with clinical application of hPSC-derived cells.
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Affiliation(s)
- Intan Rosalina Suhito
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Ee-Seul Kang
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Da-Seul Kim
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Seungho Baek
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Soon-Jung Park
- Department of Medicine, School of Medicine, Konkuk University, Seoul 05029, Republic of Korea
| | - Sung-Hwan Moon
- Department of Stem Cell Biology, School of Medicine, Konkuk University, Seoul 05029, Republic of Korea
| | - Zhengtang Luo
- Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong, China
| | - Donghyun Lee
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Junhong Min
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea; Integrative Research Center for Two-Dimensional Functional Materials, Institute of Interdisciplinary Convergence Research, Chung-Ang University, Seoul 06974, Republic of Korea.
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24
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Mammen N, Spanu L, Tyo EC, Yang B, Halder A, Seifert S, Pellin MJ, Vajda S, Narasimhan S. Using first principles calculations to interpret XANES experiments: extracting the size-dependence of the (p , T) phase diagram of sub-nanometer Cu clusters in an O 2 environment. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:144002. [PMID: 30625421 DOI: 10.1088/1361-648x/aafcf9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We have used ab initio density functional theory together with ab initio atomistic thermodynamics, and in situ x-ray absorption near edge spectroscopy (XANES) experiments, to study the oxidation of sub-nanometer clusters of Cu n O x supported on a hydroxylated amorphous alumina substrate in an O2-rich environment. We obtain (p , T) phase diagrams: these differ notably for the nanoclusters compared to the bulk. Both the theory and experiment suggest that in the presence of oxygen, the cluster will oxidize from its elemental state to the oxidized state as the temperature decreases. We obtain a clear trend for the transition of Cu n → Cu n O n/2: we see that the smaller the cluster, the greater is the tendency toward oxidation. However, we do not see a monotonic size-dependent trend for the transition of Cu n O n/2 → Cu n O n . We suggest that theoretically computed Bader charges constitute a simple yet quantitative way to align experimental measures of XANES edges with theoretical calculations, so as to yield oxidation states for nanoclusters. Our results have important implications for the use of small clusters in fields such as nanocatalysis and nanomedicine.
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Affiliation(s)
- Nisha Mammen
- Theoretical Sciences Unit and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore-560064, India
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25
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Capiod P, Bardotti L, Tamion A, Boisron O, Albin C, Dupuis V, Renaud G, Ohresser P, Tournus F. Elaboration of Nanomagnet Arrays: Organization and Magnetic Properties of Mass-Selected FePt Nanoparticles Deposited on Epitaxially Grown Graphene on Ir(111). PHYSICAL REVIEW LETTERS 2019; 122:106802. [PMID: 30932671 DOI: 10.1103/physrevlett.122.106802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 01/25/2019] [Indexed: 06/09/2023]
Abstract
The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene on Ir(111). Nanoparticles of 2 nm diameter have been mass selected in a gas phase and deposited with low energy on the hexagonal moiré pattern. Their morphology and organization have been investigated using grazing incidence small angle x-ray scattering, while their magnetic properties have been studied by x-ray magnetic circular dichroism, both pointing to a FePt cluster-graphene surface specific interaction. The spatial coherence of the nanoparticles is preserved upon annealing up to 700 °C where the hard magnetic phase of FePt is obtained.
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Affiliation(s)
- Pierre Capiod
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Laurent Bardotti
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Alexandre Tamion
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Olivier Boisron
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Clément Albin
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Véronique Dupuis
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Gilles Renaud
- Université Grenoble Alpes, CEA, INAC, MEM, F-38000 Grenoble, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, BP48, Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - Florent Tournus
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
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26
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Liang G, Zhou Y, Zhao J, Khodakov AY, Ordomsky VV. Structure-Sensitive and Insensitive Reactions in Alcohol Amination over Nonsupported Ru Nanoparticles. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02866] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guanfeng Liang
- Univ. Lille, CNRS,
Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de
Catalyse et Chimie du Solide, F-59000 Lille, France
| | - Yage Zhou
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, 130 Mei long Road, Shanghai 200237, China
- E2P2L, UMI 3464 CNRS-Solvay, 3966 Jin Du Road, 201108 Shanghai, China
| | - Jingpeng Zhao
- Univ. Lille, CNRS,
Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de
Catalyse et Chimie du Solide, F-59000 Lille, France
- E2P2L, UMI 3464 CNRS-Solvay, 3966 Jin Du Road, 201108 Shanghai, China
| | - Andrei Y. Khodakov
- Univ. Lille, CNRS,
Centrale Lille, ENSCL, Univ. Artois, UMR 8181-UCCS-Unité de
Catalyse et Chimie du Solide, F-59000 Lille, France
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27
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Abstract
Electrolysis of water is key technology, not only for clean energy production, but to ensure a continued supply of hydrogen beyond fossil resources, essential to the manufacture of many chemical goods other than fuels. Cobalt nanomaterials have been widely identified as a promising candidate for the anode (oxygen evolution) reaction in this process, but much work has focused on applied materials or electrode design. Given the importance of oxidation state changes Co(III) → Co(IV) in the accepted reaction mechanism, in this work we look at size effects in small (4–10 nm) cobalt nanoparticles, where the ease of oxidation for lower cobalt oxidation states is known to change with particle size. To discriminate between geometric and chemical effects we have compared the catalysts in this study to others in the literature by turnover frequency (widely used in other areas of catalysis), in addition to the more commonly employed performance metric of the overpotential required to produce a current density of 10 mA cm−2. Comparisons are drawn to key examples of using well defined nanomaterials (where the surface are of cobalt sites can be estimated). This has enabled an estimated intrinsic turnover rate of ~ 1 O2 molecule per surface Co atom per second at an overpotential of 500 mV in the oxygen evolution reaction under typical alkaline reaction conditions (pH 14.0) to be identified.
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Affiliation(s)
- Edward Locke
- Department of Chemistry, University of Durham, South Road, Durham, DH1 3LE UK
| | - Shan Jiang
- Department of Chemistry, University of Durham, South Road, Durham, DH1 3LE UK
| | - Simon K Beaumont
- Department of Chemistry, University of Durham, South Road, Durham, DH1 3LE UK
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28
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Catalyst support effects on hydrogen spillover. Nature 2017; 541:68-71. [DOI: 10.1038/nature20782] [Citation(s) in RCA: 437] [Impact Index Per Article: 62.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 11/03/2016] [Indexed: 12/22/2022]
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29
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Jeon JK, Han SM, Min SK, Seo SJ, Ihm K, Chang WS, Kim JK. Coulomb nanoradiator-mediated, site-specific thrombolytic proton treatment with a traversing pristine Bragg peak. Sci Rep 2016; 6:37848. [PMID: 27897205 PMCID: PMC5126678 DOI: 10.1038/srep37848] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 10/31/2016] [Indexed: 12/28/2022] Open
Abstract
Traversing proton beam-irradiated, mid/high-Z nanoparticles produce site-specific enhancement of X-ray photon-electron emission via the Coulomb nanoradiator (CNR) effect, resulting in a nano- to micro-scale therapeutic effect at the nanoparticle-uptake target site. Here, we demonstrate the uptake of iron oxide nanoparticles (IONs) and nanoradiator-mediated, site-specific thrombolysis without damaging the vascular endothelium in an arterial thrombosis mouse model. The enhancement of low-energy electron (LEE) emission and reactive oxygen species (ROS) production from traversing proton beam-irradiated IONs was examined. Flow recovery was only observed in CNR-treated mice, and greater than 50% removal of the thrombus was achieved. A 2.5-fold greater reduction in the thrombus-enabled flow recovery was observed in the CNR group compared with that observed in the untreated ION-only and proton-only control groups (p < 0.01). Enhancement of the X-ray photon-electron emission was evident from both the pronounced Shirley background in the electron yield and the 1.2- to 2.5-fold enhanced production of ROS by the proton-irradiated IONs, which suggests chemical degradation of the thrombus without potent emboli.
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Affiliation(s)
- Jae-Kun Jeon
- Departments of Biomedical Engineering, Catholic University of Daegu, School of Medicine, Daegu, Korea
| | - Sung-Mi Han
- Anatomy, and Diagnostic Imaging, Catholic University of Daegu, School of Medicine, Daegu, Korea
| | - Soon-Ki Min
- Catholic University of Daegu, School of Medicine, Daegu, Korea
| | - Seung-Jun Seo
- Departments of Biomedical Engineering, Catholic University of Daegu, School of Medicine, Daegu, Korea
| | - Kyuwook Ihm
- Pohang Accelerator Laboratory, Pohang, Korea
| | - Won-Seok Chang
- Departments of Biomedical Engineering, Catholic University of Daegu, School of Medicine, Daegu, Korea
| | - Jong-Ki Kim
- Departments of Biomedical Engineering, Catholic University of Daegu, School of Medicine, Daegu, Korea
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30
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Shin Y, Persson KA. Surface Morphology and Surface Stability against Oxygen Loss of the Lithium-Excess Li2MnO3 Cathode Material as a Function of Lithium Concentration. ACS APPLIED MATERIALS & INTERFACES 2016; 8:25595-25602. [PMID: 27598948 DOI: 10.1021/acsami.6b07259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
There is a growing appreciation for the role of surface reactivity and subsequent reconstruction affecting the performance of high-voltage, high-capacity Li-ion cathode materials. In particular, the promising Li-excess materials are known to exhibit significant vulnerability toward oxygen release, which can cause surface densification and impede Li intercalation. Here we focus on the end member, Li2MnO3, as a Li-excess, Mn-rich representative of this class of materials and systematically elucidate all possible stoichiometric low Miller index surfaces with various cation ordering on each surface. We apply surface cation reconstruction rules that depend on the local environment, including target Mn-Li site exchanges, and optimize the resulting surface Li configurations using metadynamics. The equilibrium Wulff shape shows dominant (001), (010) surface facets, and almost all facets exhibit favorable Mn reconstruction. Most importantly, we find that while all equilibrium LixMnO3 surfaces become unstable toward oxygen release for x < 1.7, some facets are consistently more resistant than others which may provide a design metric for more stable particle morphologies and enhanced surface oxygen retention.
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Affiliation(s)
- Yongwoo Shin
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Kristin A Persson
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
- Department of Materials Science and Engineering, University of California Berkeley , Berkeley, California 94720, United States
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