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Ennehary S, Toufik H, Bouzzine SM, Lazrak M, Lamchouri F. Theoretical investigation for dye-sensitized solar cells: effect of donor variation on the optoelectronic properties and charge transfer parameters. RESEARCH ON CHEMICAL INTERMEDIATES 2023. [DOI: 10.1007/s11164-023-04971-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
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2
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5-Hydroxymethylfurfural Oxidation to 2,5-Furandicarboxylic Acid on Noble Metal-Free Nanocrystalline Mixed Oxide Catalysts. Catalysts 2022. [DOI: 10.3390/catal12080814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Noble metal-free catalysts based on earth-abundant and inexpensive mixed oxides are active catalysts of all steps of the reaction cascade leading from 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) using tert-butyl hydroperoxide (TBHP) as oxidation agent. Catalysts covering the whole range of composition in the Cu-Mn and Co-Fe series have been prepared and characterised. The nature and composition of the catalyst strongly affect conversion and selectivity. The distribution of products indicates that radical-type oxygen species, deriving from the activation of TBHP, play a determining role in the reaction. The early steps of reaction mainly follow the pattern expected for heterogeneous Fenton catalysts. Mixed oxide catalysts are the most effective in further oxidation steps, leading to the formation of FDCA, both in the Cu-Mn and Co-Fe systems. This behaviour can be related to the distribution of charge in the mixed oxides, suggesting a possible implication of the lattice oxygen in the last reaction steps. The results provide indications on how to optimize the reaction and minimize the formation of byproducts (humins and oligomers).
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Benkun W, Huijun X, Zhihao Y, Baoliang L, Boxiang M, Jun F, Qingyang D. Preparation and Photocatalytic Activity of (Fe2.5Ti0.5)1.04O4/Ti4O7 Nanocomposites. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422060292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang M, Li D, Hong Y, Niu Z, Yang Z, Jia D, Zhou Y. Study on the oxygen diffusion in the oxide layers of SiBCN ceramics by SIMS. Ann Ital Chir 2022. [DOI: 10.1016/j.jeurceramsoc.2021.12.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wiegmann T, Pacheco I, Reikowski F, Stettner J, Qiu C, Bouvier M, Bertram M, Faisal F, Brummel O, Libuda J, Drnec J, Allongue P, Maroun F, Magnussen OM. Operando Identification of the Reversible Skin Layer on Co 3O 4 as a Three-Dimensional Reaction Zone for Oxygen Evolution. ACS Catal 2022; 12:3256-3268. [PMID: 35359579 PMCID: PMC8939430 DOI: 10.1021/acscatal.1c05169] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/06/2022] [Indexed: 01/19/2023]
Abstract
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Co oxides and oxyhydroxides
have been studied extensively in the
past as promising electrocatalysts for the oxygen evolution reaction
(OER) in neutral to alkaline media. Earlier studies showed the formation
of an ultrathin CoOx(OH)y skin layer on Co3O4 at potentials
above 1.15 V vs reversible hydrogen electrode (RHE), but the precise
influence of this skin layer on the OER reactivity is still under
debate. We present here a systematic study of epitaxial spinel-type
Co3O4 films with defined (111) orientation,
prepared on different substrates by electrodeposition or physical
vapor deposition. The OER overpotential of these samples may vary
up to 120 mV, corresponding to two orders of magnitude differences
in current density, which cannot be accounted for by differences in
the electrochemically active surface area. We demonstrate by a careful
analysis of operando surface X-ray diffraction measurements
that these differences are clearly correlated with the average thickness
of the skin layer. The OER reactivity increases with the amount of
formed skin layer, indicating that the entire three-dimensional skin
layer is an OER-active interphase. Furthermore, a scaling relationship
between the reaction centers in the skin layer and the OER activity
is established. It suggests that two lattice sites are involved in
the OER mechanism.
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Affiliation(s)
- Tim Wiegmann
- Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany
| | - Ivan Pacheco
- Laboratoire de Physique de la Matière Condensée (PMC), CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
| | - Finn Reikowski
- Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany
| | - Jochim Stettner
- Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany
| | - Canrong Qiu
- Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany
| | - Mathilde Bouvier
- Laboratoire de Physique de la Matière Condensée (PMC), CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
| | - Manon Bertram
- Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Firas Faisal
- Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Olaf Brummel
- Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Jörg Libuda
- Interface Research and Catalysis, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91054 Erlangen, Germany
| | - Jakub Drnec
- European Synchrotron Radiation Facility, 38000 Grenoble, France
| | - Philippe Allongue
- Laboratoire de Physique de la Matière Condensée (PMC), CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
| | - Fouad Maroun
- Laboratoire de Physique de la Matière Condensée (PMC), CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France
| | - Olaf M. Magnussen
- Institute of Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany
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Hudy C, Gryboś J, Steenbakkers K, Góra-Marek K, Zasada F, Sojka Z. Isotopic evidence for the tangled mechanism of the CO-PROX reaction over mixed and bare cobalt spinel catalysts. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01063a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic performance of the bare Co3O4 and mixed cobalt-spinel catalysts (MxCo3−xO4; M = Cr, Mn, Fe, Ni, Cu, Zn) in the CO-PROX process was investigated in the temperature-programmed surface reaction (TPSR) mode using 18O2 as an oxidant.
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Affiliation(s)
- Camillo Hudy
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Joanna Gryboś
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Kim Steenbakkers
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Kinga Góra-Marek
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Filip Zasada
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
| | - Zbigniew Sojka
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, Poland
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Rushiti A, Hättig C. Activation of Molecular O 2 on CoFe 2 O 4 (001) Surfaces: An Embedded Cluster Study. Chemistry 2021; 27:17115-17126. [PMID: 34668611 PMCID: PMC9299649 DOI: 10.1002/chem.202102784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Indexed: 11/22/2022]
Abstract
Dioxygen activation pathways on the (001) surfaces of cobalt ferrite, CoFe2 O4 , were investigated computationally using density functional theory and the hybrid Perdew-Burke-Ernzerhof exchange-correlation functional (PBE0) within the periodic electrostatic embedded cluster model. We considered two terminations: the A-layer exposing Fe2+ and Co2+ metal sites in tetrahedral and octahedral positions, respectively, and the B-layer exposing octahedrally coordinated Co3+ . On the A-layer, molecular oxygen is chemisorbed as a superoxide on the Fe monocenter or bridging a Fe-Co cation pair, whereas on the B-layer it is adsorbed at the most stable anionic vacancy. Activation is promoted by transfer of electrons provided by the d metal centers onto the adsorbed oxygen. The subsequent dissociation of dioxygen into monoatomic species and surface reoxidation have been identified as the most critical steps that may limit the rate of the oxidation processes. Of the reactive metal-O species, [FeIII -O]2+ is thermodynamically most stable, while the oxygen of the Co-O species may easily migrate across the A-layer with barriers smaller than the associative desorption.
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Affiliation(s)
- Arjeta Rushiti
- Department of Theoretical ChemistryRuhr University Bochum44780BochumGermany
| | - Christof Hättig
- Department of Theoretical ChemistryRuhr University Bochum44780BochumGermany
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Dynamics of Reactive Oxygen Species on Cobalt-Containing Spinel Oxides in Cyclic CO Oxidation. Catalysts 2021. [DOI: 10.3390/catal11111312] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Reactive oxygen species (ROS) are considered to be responsible for the high catalytic activity of transition metal oxides like Co3-xFexO4 in oxidation reactions, but the detailed influences of catalyst composition and morphology on the formation of these reactive oxygen species are not fully understood. In the presented study, Co3O4 spinels of different mesostructures, i.e., particle size, crystallinity, and specific surface area, are characterized by powder X-ray diffraction, scanning electron microscopy, and physisorption. The materials were tested in CO oxidation performed in consecutive runs and compared to a Co3-xFexO4 composition series with a similar mesostructure to study the effects of catalyst morphology and composition on ROS formation. In the first run, the CO conversion was observed to be dominated by the exposed surface area for the pure Co-spinels, while a negative effect of Fe content in the spinels was seen. In the following oxidation run, a U-shaped conversion curve was observed for materials with high surface area, which indicated the in situ formation of ROS on those materials that were responsible for the new activity at low temperature. This activation was not stable at the higher reaction temperature but was confirmed after temperature-programmed oxidation (TPO). However, no activation after the first run was observed for low-surface-area and highly crystalline materials, and the lowest surface-area material was not even activated after TPO. Among the catalyst series studied here, a correlation of small particle size and large surface area with the ability for ROS formation is presented, and the benefit of a nanoscaled catalyst is discussed. Despite the generally negative effect of Fe, the highest relative activation was observed at intermediate Fe contents suggesting that Fe may be involved in ROS formation.
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Falk T, Anke S, Hajiyani H, Saddeler S, Schulz S, Pentcheva R, Peng B, Muhler M. Influence of the particle size on selective 2-propanol gas-phase oxidation over Co 3O 4 nanospheres. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00944c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Co3O4 nanospheres with a preferential (110) surface orientation showed excellent catalytic properties in the selective gas-phase oxidation of 2-propanol. A preferential Mars–van Krevelen mechanism on the Co3O4(110) surface was identified by DFT + U.
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Affiliation(s)
- Tobias Falk
- Laboratory of Industrial Chemistry, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
| | - Sven Anke
- Laboratory of Industrial Chemistry, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
| | - Hamidreza Hajiyani
- Department of Physics, Theoretical Physics, and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Sascha Saddeler
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 5-7, 45141 Essen, Germany
| | - Stephan Schulz
- Faculty of Chemistry, Inorganic Chemistry, and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 5-7, 45141 Essen, Germany
| | - Rossitza Pentcheva
- Department of Physics, Theoretical Physics, and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
| | - Baoxiang Peng
- Laboratory of Industrial Chemistry, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Martin Muhler
- Laboratory of Industrial Chemistry, Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
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Why Ca2NH works as an efficient and stable support of Ru catalyst in ammonia synthesis. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-020-04332-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Zasada F, Gryboś J, Hudy C, Janas J, Sojka Z. Total oxidation of lean methane over cobalt spinel nanocubes—Mechanistic vistas gained from DFT modeling and catalytic isotopic investigations. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.03.061] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Zasada F, Gryboś J, Budiyanto E, Janas J, Sojka Z. Oxygen species stabilized on the cobalt spinel nano-octahedra at various reaction conditions and their role in catalytic CO and CH4 oxidation, N2O decomposition and oxygen isotopic exchange. J Catal 2019. [DOI: 10.1016/j.jcat.2019.02.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Zasada F, Janas J, Piskorz W, Gorczyńska M, Sojka Z. Total Oxidation of Lean Methane over Cobalt Spinel Nanocubes Controlled by the Self-Adjusted Redox State of the Catalyst: Experimental and Theoretical Account for Interplay between the Langmuir–Hinshelwood and Mars–Van Krevelen Mechanisms. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03139] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Filip Zasada
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Janusz Janas
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Witold Piskorz
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Magdalena Gorczyńska
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
| | - Zbigniew Sojka
- Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Krakow, Poland
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