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Zaraq A, Orayech B, Igartua JM, El Bouari A, Gregory DH, Gesing TM. Crystallography at non-ambient conditions and physical properties of the synthesized double perovskites, Sr 2(Co 1-xFe x)TeO 6. Dalton Trans 2023; 52:4086-4102. [PMID: 36880967 DOI: 10.1039/d2dt03543j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Polycrystalline double perovskite-type Sr2(Co1-xFex)TeO6 with various stoichiometric compositions (x = 0, 0.25, 0.5, 0.75, and 1) were synthesized by solid-state reactions in air. The crystal structures and phase transitions of this series at different temperature intervals were determined by X-ray powder diffraction, and from the obtained data the crystal structures were refined. It has been proven that for the compositions x = 0.25, 0.50, and 0.75, the phases crystallize at room temperature in the monoclinic space group I2/m. Down to 100 K, depending on the composition, these structures experience a phase transition from I2/m to P21/n. At high temperatures up to 1100 K their crystal structures show two further phase transitions. The first one is a first-order phase transition, from monoclinic I2/m to tetragonal I4/m, followed by a second-order phase transition to cubic Fm3̄m. Therefore, the phase transition sequence of this series detected at temperatures ranging from 100 K to 1100 K is P21/n → I2/m → I4/m → Fm3̄m. The temperature-dependent vibrational features of the octahedral sites were investigated by Raman spectroscopy, which furthermore complements the XRD results. A decrease in the phase-transition temperature with increasing iron content has been observed for these compounds. This fact is explained by the progressive diminishing of the distortion of the double-perovskite structure in this series. Using room-temperature Mössbauer spectroscopy, the presence of two iron sites is confirmed. The two different transition metal cations Co and Fe at the B sites allow exploring their effect on the optical band-gap.
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Affiliation(s)
- Asmaa Zaraq
- University of Bremen, Institute of Inorganic Chemistry and Crystallography, Bremen, Germany.
| | - Brahim Orayech
- Maxam, Technology Center Energetic Materials, Carretera N-623 km 28, 09141Quintanilla Sobresierra, Burgos, Spain
| | - Josu M Igartua
- Universidad del País Vasco/Euskal Herriko Unibertsitatea UPV/EHU: Leioa, Bizkaia, España
| | - Abdeslam El Bouari
- Laboratory of Physical-Chemistry, Materials and Catalysis, Department of Chemistry, Faculty of Sciences Ben M'Sik, University Hassan II of Casablanca, Casablanca, Morocco
| | - Duncan H Gregory
- WestCHEM School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow G12 8QQ, UK
| | - Thorsten M Gesing
- University of Bremen, Institute of Inorganic Chemistry and Crystallography, Bremen, Germany. .,University of Bremen, MAPEX Center for Materials and Processes, Bremen, Germany
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2
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An Iron-Doped Calcium Titanate Cocatalyst for the Oxygen Reduction Reaction. Catalysts 2023. [DOI: 10.3390/catal13010127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The oxygen reduction reaction (ORR) is an important challenge in the development and large-scale distribution of energy conversion devices, especially low-temperature proton exchange membrane (PEM) fuel cells. In order to speed up the ORR kinetics and improve fuel cell performance, iron-doped calcium titanate (CTFO) is proposed as a cocatalyst. Fundamental physical and chemical characterizations by means of X-ray diffraction, infrared spectroscopy, and morphological and thermal analyses for the understanding of the functional features of the proposed materials were carried out. Composite catalysts containing different amounts of CTFO additive with respect to platinum (i.e., Pt:CTFO 1:0.5 and 1:1 wt:wt) were studied using a rotating disk electrode (RDE). Fuel cell tests were performed at 80 °C under 30% and 80% relative humidity. The best Pt:CTFO composite catalyst was compared to a bare Pt/C and a Pt/C:CaTiO3−δ 1:1 catalyst, revealing superior performances of the latter at high relative humidity fuel cell operation, as a combined result of an optimized electrolyte-electrode interface and improved ORR kinetics due to the inorganic additive.
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Ivanov IL, Zakiryanov PO, Sereda VV, Mazurin MO, Malyshkin DA, Zuev AY, Tsvetkov DS. Nonstoichiometry, Defect Chemistry and Oxygen Transport in Fe-Doped Layered Double Perovskite Cobaltite PrBaCo 2-xFe xO 6-δ ( x = 0-0.6) Membrane Materials. MEMBRANES 2022; 12:1200. [PMID: 36557108 PMCID: PMC9783566 DOI: 10.3390/membranes12121200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/22/2022] [Accepted: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Mixed conducting cobaltites PrBaCo2-xFexO6-δ (x = 0-0.6) with a double perovskite structure are promising materials for ceramic semi-permeable membranes for oxygen separation and purification due to their fast oxygen exchange and diffusion capability. Here, we report the results of the detailed study of an interplay between the defect chemistry, oxygen nonstoichiometry and oxygen transport in these materials as a function of iron doping. We show that doping leads to a systematic variation of both the thermodynamics of defect formation reactions and oxygen transport properties. Thus, iron doping can be used to optimize the performance of mixed conducting oxygen-permeable double perovskite membrane materials.
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Klyndyuk AI, Chizhova EA, Kharytonau DS, Medvedev DA. Layered Oxygen-Deficient Double Perovskites as Promising Cathode Materials for Solid Oxide Fuel Cells. MATERIALS 2021; 15:ma15010141. [PMID: 35009288 PMCID: PMC8746150 DOI: 10.3390/ma15010141] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 12/18/2021] [Accepted: 12/22/2021] [Indexed: 11/16/2022]
Abstract
Development of new functional materials with improved characteristics for solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) is one of the most important tasks of modern materials science. High electrocatalytic activity in oxygen reduction reactions (ORR), chemical and thermomechanical compatibility with solid electrolytes, as well as stability at elevated temperatures are the most important requirements for cathode materials utilized in SOFCs. Layered oxygen-deficient double perovskites possess the complex of the above-mentioned properties, being one of the most promising cathode materials operating at intermediate temperatures. The present review summarizes the data available in the literature concerning crystal structure, thermal, electrotransport-related, and other functional properties (including electrochemical performance in ORR) of these materials. The main emphasis is placed on the state-of-art approaches to improving the functional characteristics of these complex oxides.
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Affiliation(s)
- Andrei I. Klyndyuk
- Department of Physical, Colloid and Analytical Chemistry, Organic Substances Technology Faculty, Belarusian State Technological University, Sverdlova 13a, 220006 Minsk, Belarus;
- Correspondence:
| | - Ekaterina A. Chizhova
- Department of Physical, Colloid and Analytical Chemistry, Organic Substances Technology Faculty, Belarusian State Technological University, Sverdlova 13a, 220006 Minsk, Belarus;
| | - Dzmitry S. Kharytonau
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland;
| | - Dmitry A. Medvedev
- Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Ural Branch of Russian Academy of Sciences, 620660 Ekaterinburg, Russia;
- Hydrogen Energy Laboratory, Ural Federal University, 620002 Ekaterinburg, Russia
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Marelli E, Gazquez J, Poghosyan E, Müller E, Gawryluk DJ, Pomjakushina E, Sheptyakov D, Piamonteze C, Aegerter D, Schmidt TJ, Medarde M, Fabbri E. Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo
2
O
5+
δ
. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Elena Marelli
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Jaume Gazquez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC) Campus UAB, Bellaterra 08193 Barcelona Spain
| | - Emiliya Poghosyan
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Elisabeth Müller
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | | | | | - Denis Sheptyakov
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Cinthia Piamonteze
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Dino Aegerter
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Thomas J. Schmidt
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
- Laboratory of Physical Chemistry ETH Zurich 8093 Zurich Switzerland
| | - Marisa Medarde
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Emiliana Fabbri
- Paul Scherrer Institute Forschungsstrasse 111 5232 Villigen PSI Switzerland
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Marelli E, Gazquez J, Poghosyan E, Müller E, Gawryluk DJ, Pomjakushina E, Sheptyakov D, Piamonteze C, Aegerter D, Schmidt TJ, Medarde M, Fabbri E. Correlation between Oxygen Vacancies and Oxygen Evolution Reaction Activity for a Model Electrode: PrBaCo 2 O 5+δ. Angew Chem Int Ed Engl 2021; 60:14609-14619. [PMID: 33826206 DOI: 10.1002/anie.202103151] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Indexed: 11/12/2022]
Abstract
The role of the perovskite lattice oxygen in the oxygen evolution reaction (OER) is systematically studied in the PrBaCo2 O5+δ family. The reduced number of physical/chemical variables combined with in-depth characterizations such as neutron dif-fraction, O K-edge X-ray absorption spectroscopy (XAS), electron energy loss spectroscopy (EELS), magnetization and scanning transmission electron microscopy (STEM) studies, helps investigating the complex correlation between OER activity and a single perovskite property, such as the oxygen content. Larger amount of oxygen vacancies appears to facilitate the OER, possibly contributing to the mechanism involving the oxidation of lattice oxygen, i.e., the lattice oxygen evolution reaction (LOER). Furthermore, not only the number of vacancies but also their local arrangement in the perovskite lattice influences the OER activity, with a clear drop for the more stable, ordered stoichiometry.
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Affiliation(s)
- Elena Marelli
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Jaume Gazquez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra, 08193, Barcelona, Spain
| | - Emiliya Poghosyan
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Elisabeth Müller
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Dariusz J Gawryluk
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | | | - Denis Sheptyakov
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Cinthia Piamonteze
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Dino Aegerter
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Thomas J Schmidt
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland.,Laboratory of Physical Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Marisa Medarde
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Emiliana Fabbri
- Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
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Sankar SS, Keerthana G, Manjula K, Sharad JH, Kundu S. Electrospun Fe-Incorporated ZIF-67 Nanofibers for Effective Electrocatalytic Water Splitting. Inorg Chem 2021; 60:4034-4046. [DOI: 10.1021/acs.inorgchem.1c00097] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Selvasundarasekar Sam Sankar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Electrochemical Process Engineering (EPE) Division, CSIR—Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India
| | - Govindaraj Keerthana
- Centre for Education (CFE), CSIR—Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India
| | - Karthikeyan Manjula
- Centre for Education (CFE), CSIR—Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India
| | | | - Subrata Kundu
- Electrochemical Process Engineering (EPE) Division, CSIR—Central Electrochemical Research Institute (CECRI), Karaikudi 630003, Tamil Nadu, India
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Badruzzaman A, Yuda A, Ashok A, Kumar A. Recent advances in cobalt based heterogeneous catalysts for oxygen evolution reaction. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119854] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Perovskites are currently on everyone’s lips and have made it in high-impact scientific journals because of the revolutionary hybrid organic–inorganic lead halide perovskite materials for solar cells [...]
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Tuning the Co Oxidation State in Ba0.5Sr0.5Co0.8Fe0.2O3-δ by Flame Spray Synthesis Towards High Oxygen Evolution Reaction Activity. Catalysts 2020. [DOI: 10.3390/catal10090984] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The perovskite-type oxide Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) is known as a highly active and stable oxygen evolution reaction (OER) electrocatalyst composited out of non-noble metals. The possibility of using the scalable flame spray synthesis (FSS) technique for the production of BSCF nanoparticles intensified the interest in this material for a future application in an alkaline water electrolyzer. A possible scale-up would require the optimization of the synthesis parameters to maximize the production rate. To further understand the influence of the synthesis parameters of the tunable FSS on the OER activity of BSCF, a systematic study was carried out by producing BSCF with different total metal concentrations (CTM), flow rates of the precursor solution (FRPS) and of the dispersion gas (FRDG). This study reveals that all three parameters have a direct impact on the OER activity of BSCF—measured in a rotating disc electrode (RDE) setup—due to the controllability of the initial Co and Fe oxidation state—indicated by X-ray absorption spectroscopy (XAS) measurements—and with that also of the oxygen vacancy concentration in the as-synthesized BSCF. This controllability enables the optimization of the OER activity of BSCF and emphasizes the importance of having Co in a lower initial oxidation state for reaching a high electrocatalytic performance.
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Li J, Chu D, Dong H, Baker DR, Jiang R. Boosted Oxygen Evolution Reactivity by Igniting Double Exchange Interaction in Spinel Oxides. J Am Chem Soc 2019; 142:50-54. [DOI: 10.1021/jacs.9b10882] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jiangtian Li
- U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - Deryn Chu
- U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - Hong Dong
- U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - David R. Baker
- U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
| | - Rongzhong Jiang
- U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, United States
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