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El-Refaei SM, Rauret DL, Manjón AG, Spanos I, Zeradjanin A, Dieckhöfer S, Arbiol J, Schuhmann W, Masa J. Ni-Xides (B, S, and P) for Alkaline OER: Shedding Light on Reconstruction Processes and Interplay with Incidental Fe Impurities as Synergistic Activity Drivers. ACS Appl Energy Mater 2024; 7:1369-1381. [PMID: 38425378 PMCID: PMC10900598 DOI: 10.1021/acsaem.3c03114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/10/2024] [Accepted: 01/18/2024] [Indexed: 03/02/2024]
Abstract
Ni-Xides (X = B, P, or S) exhibit intriguing properties that have endeared them for electrocatalytic water splitting. However, the role of B, P, and S, among others, in tailoring the catalytic performance of the Ni-Xides remains vaguely understood, especially if they are studied in unpurified KOH (Un-KOH) because of the renowned impact of incidental Fe impurities. Therefore, decoupling the effect induced by Fe impurities from inherent material reconstruction processes necessitates investigation of the materials in purified KOH solutions (P-KOH). Herein, studies of the OER on Ni2B, Ni2P, and Ni3S2 in P-KOH and Un-KOH coupled with in situ Raman spectroscopy, ex situ post-electrocatalysis, and online dissolution studies by ICP-OES are used to unveil the distinctive role of Ni-Xide reconstruction and the role of Fe impurities and their interplay on the electrocatalytic behavior of the three Ni-Xide precatalysts during the OER. There was essentially no difference in the OER activity and the electrochemical Ni2+/Ni3+ redox activation fingerprints of the three precatalysts via cyclic voltammetry in P-KOH, whereas their OER activity was considerably higher in Un-KOH with marked differences in the intrinsic activity and evolution of the Ni2+/Ni3+ fingerprint redox peaks. Thus, in the absence of Fe in the electrolyte (P-KOH), neither the nature of the guest element (B, P, and S) nor the underlying reconstruction processes are decisive activity drivers. This underscores the crucial role played by incidental Fe impurities on the OER activity of Ni-Xide precatalysts, which until now has been overlooked. In situ Raman spectroscopy revealed that the nickel hydroxide derived from Ni2B exhibits higher disorder than in the case of Ni2P and Ni3S2, both exhibiting a similar degree of disorder. The guest elements thus influence the degree of disorder of the formed nickel oxyhydroxides, which through their synergistic interaction with incidental Fe impurities concertedly realize high OER performance.
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Affiliation(s)
- Sayed Mahmoud El-Refaei
- Max-Planck-Institut
für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - David Llorens Rauret
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia Spain
| | - Alba G. Manjón
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia Spain
| | - Ioannis Spanos
- Max-Planck-Institut
für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Aleksandar Zeradjanin
- Max-Planck-Institut
für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Stefan Dieckhöfer
- Analytical
Chemistry, Center for Electrochemical Sciences (CES), Faculty of Chemistry
and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
| | - Jordi Arbiol
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Catalonia, Spain
| | - Wolfgang Schuhmann
- Analytical
Chemistry, Center for Electrochemical Sciences (CES), Faculty of Chemistry
and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
| | - Justus Masa
- Max-Planck-Institut
für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
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2
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Spanos I, Stevens CJ, Solymar L, Shamonina E. Tailoring the dispersion characteristics in planar arrays of discrete and coalesced split ring resonators. Sci Rep 2023; 13:19981. [PMID: 37968309 PMCID: PMC10652018 DOI: 10.1038/s41598-023-47216-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 11/10/2023] [Indexed: 11/17/2023] Open
Abstract
In this report, the coupling and dispersion characteristics of discrete and coalesced square resonators was investigated in the MHz regime. Resonators with one and three gaps were considered. When the resonators are not in direct contact, the number of gaps has little effect upon the total coupling, which is negative. When the resonators are connected so that they share one side, the coupling can change drastically depending on the number of gaps. In particular, when the shared side has a gap, the total coupling coefficient switches to positive values, making it possible for forward travelling waves to propagate on arrays. Experimental, numerical and analytical data verify this behaviour.
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Affiliation(s)
- Ioannis Spanos
- Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK.
| | | | - Laszlo Solymar
- Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK
| | - Ekaterina Shamonina
- Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK
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3
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Symeonidis PD, Tsatlidou M, Spanos I, Papageorgiou M, Kesisis G, Zarampouka K. Diffuse Tenosynovial Giant Cell Tumor Encircling the First Metatarsal Bone Remodeling after Resection. A Case Report. J Orthop Case Rep 2023; 13:89-93. [PMID: 37398543 PMCID: PMC10308984 DOI: 10.13107/jocr.2023.v13.i06.3708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 04/20/2023] [Indexed: 07/04/2023] Open
Abstract
Introduction The term tenosynovial giant cell tumor encompasses a group of rare soft-tissue tumors. A new classification divides the group in localized and diffuse type, depending on the involvement of the surrounding tissues. Due to the unclear origin and heterogeneity in extend of the diffuse-type giant cell tumors, there is only limited evidence on the tumor-specific treatment. Thus, every case report has an added value toward setting disease-specific guidelines. Case Report Presentation of a diffuse type tenosynovial giant cell tumor encircling the first metatarsal. The tumor had mechanically eroded the plantar aspect of the distal metaphysis, with no signs of tumor spread. After an open biopsy, resection of the mass was performed without debriding or resecting the first metatarsal. Repeat imaging postoperatively showed no recurrence at 4-year follow-up and a bony remodeling of the lesion. Conclusion Bone remodeling is possible after complete resection of diffuse tenosynovial giant cell tumor when the erosion is caused by mechanical pressure and no intraosseous expansion of the tumor is present.
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Affiliation(s)
- Panagiotis D Symeonidis
- Department of Orthopaedic, St Luke’s Hospital, Panorama, Thessaloniki, Greece, Thessaloniki, Greece
| | - Maria Tsatlidou
- Department of Orthopaedic, St Luke’s Hospital, Panorama, Thessaloniki, Greece, Thessaloniki, Greece
| | - Ioannis Spanos
- Department of Orthopaedic, St Luke’s Hospital, Panorama, Thessaloniki, Greece, Thessaloniki, Greece
| | | | - Georgios Kesisis
- Department of Orthopaedic, St Luke’s Hospital, Panorama, Thessaloniki, Greece, Thessaloniki, Greece
| | - Katerina Zarampouka
- Department of Pathology, Medical School of Aristotle University of Thessaloniki, Greece
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4
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Barrios Jiménez AM, Sichevych O, Spanos I, Altendorf SG, Ormeci A, Antonyshyn I. Al-Pt compounds catalyzing the oxygen evolution reaction. Dalton Trans 2023; 52:1433-1440. [PMID: 36645002 DOI: 10.1039/d2dt03234a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Al-Pt compounds have been systematically studied as electrocatalysts for the oxygen evolution reaction (OER). Considering the harsh oxidative conditions of the OER, all Al-Pt compounds undergo modifications during electrochemical experiments. However, the degree of changes strongly depends on the composition and crystal structure of a compound. In contrast to Al-rich compounds (Al4Pt and Al21Pt8), which reveal strong leaching of aluminum, changes in other compounds (Al2Pt, Al3Pt2, rt-AlPt, Al3Pt5, and rt-AlPt3) take place only on the surface or in the near-surface region. Furthermore, surface modification leads to a change in the electronic structure of Pt, giving rise to the in situ formation of catalytically more active surfaces, which are composed of intermetallic compounds, Pt-rich AlxPt1-x phases and Pt oxides. Forming a compromise between sufficient OER activity and stability, Al2Pt and Al3Pt2 can be considered as precursors for OER electrocatalysts.
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Affiliation(s)
| | - Olga Sichevych
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
| | - Ioannis Spanos
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Simone G Altendorf
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
| | - Alim Ormeci
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
| | - Iryna Antonyshyn
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany. .,Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
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5
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Kang S, Im C, Spanos I, Ham K, Lim A, Jacob T, Schlögl R, Lee J. Durable Nickel-Iron (Oxy)hydroxide Oxygen Evolution Electrocatalysts through Surface Functionalization with Tetraphenylporphyrin. Angew Chem Int Ed Engl 2022; 61:e202214541. [PMID: 36274053 DOI: 10.1002/anie.202214541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Indexed: 11/05/2022]
Abstract
NiFe-based oxides are one of the best-known active oxygen evolution electrocatalysts. Unfortunately, they rapidly lost performance in Fe-purified KOH during the reaction. Herein, tetraphenylporphyrin (TPP) was loaded on a catalyst/electrolyte interface to alleviate the destabilization of NiFe (oxy)hydroxide. We propose that the degradation occurs primarily due to the release of thermodynamically unstable Fe. TPP acts as a protective layer and suppresses the dissolution of hydrated metal at the catalyst/electrolyte interface. In the electric double layer, the nonpolar TPP layer on the NiFe surface also invigorates the redeposition of the active site, Fe, which leads to prolonging the lifetime of NiFe. The TPP-coated NiFe was demonstrated in anion exchange membrane water electrolysis, where hydrogen was generated at a rate of 126 L h-1 for 115 h at a 1.41 mV h-1 degradation rate. Consequently, TPP is a promising protective layer that could stabilize oxygen evolution electrocatalysts.
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Affiliation(s)
- Sinwoo Kang
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.,International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS), GIST, Gwangju, 61005, Republic of Korea
| | - Changbin Im
- Institute of Electrochemistry, Ulm University, Ulm, Germany
| | - Ioannis Spanos
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Kahyun Ham
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.,International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS), GIST, Gwangju, 61005, Republic of Korea.,Ertl Center for Electrochemistry and Catalysis, GIST, Gwangju, 61005, Republic of Korea
| | - Ahyoun Lim
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany
| | - Timo Jacob
- Institute of Electrochemistry, Ulm University, Ulm, Germany.,Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage, Ulm, Germany.,Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Robert Schlögl
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470, Mülheim an der Ruhr, Germany.,Department of Inorganic Chemistry, Fritz Haber Institut der Max-Planck-Gesselschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Jaeyoung Lee
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.,International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS), GIST, Gwangju, 61005, Republic of Korea.,Ertl Center for Electrochemistry and Catalysis, GIST, Gwangju, 61005, Republic of Korea
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Kang S, Im C, Spanos I, Ham K, Lim A, Jacob T, Schlögl R, Lee J. Durable Nickel‐Iron (Oxy)hydroxide Oxygen Evolution Electrocatalysts through Surface Functionalization with Tetraphenylporphyrin. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/anie.202216924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Sinwoo Kang
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
| | - Changbin Im
- Institute of Electrochemistry Ulm University Ulm Germany
| | - Ioannis Spanos
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Kahyun Ham
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
- Ertl Center for Electrochemical and Catalysis GIST Gwangju 61005 Republic of Korea
| | - Ahyoun Lim
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Timo Jacob
- Institute of Electrochemistry Ulm University Ulm Germany
- Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage Ulm Germany
- Karlsruhe Institute of Technology (KIT) Karlsruhe Germany
| | - Robert Schlögl
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- Department of Inorganic Chemistry Fritz Haber Institut der Max-Planck-Gesselschaft Faradayweg 4–6 14195 Berlin Germany
| | - Jaeyoung Lee
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
- Ertl Center for Electrochemical and Catalysis GIST Gwangju 61005 Republic of Korea
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7
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Kang S, Im C, Spanos I, Ham K, Lim A, Jacob T, Schlögl R, Lee J. Durable Nickel‐Iron (Oxy)hydroxide Oxygen Evolution Electrocatalysts through Surface Functionalization with Tetraphenylporphyrin. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202216924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Sinwoo Kang
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
| | - Changbin Im
- Institute of Electrochemistry Ulm University Ulm Germany
| | - Ioannis Spanos
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Kahyun Ham
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
- Ertl Center for Electrochemical and Catalysis GIST Gwangju 61005 Republic of Korea
| | - Ahyoun Lim
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Timo Jacob
- Institute of Electrochemistry Ulm University Ulm Germany
- Helmholtz-Institute Ulm (HIU) Electrochemical Energy Storage Ulm Germany
- Karlsruhe Institute of Technology (KIT) Karlsruhe Germany
| | - Robert Schlögl
- Department of Heterogeneous Reactions Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- Department of Inorganic Chemistry Fritz Haber Institut der Max-Planck-Gesselschaft Faradayweg 4–6 14195 Berlin Germany
| | - Jaeyoung Lee
- School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology (GIST) Gwangju 61005 Republic of Korea
- International Future Research Center of Chemical Energy Storage and Conversion Processes (ifRC-CHESS) GIST Gwangju 61005 Republic of Korea
- Ertl Center for Electrochemical and Catalysis GIST Gwangju 61005 Republic of Korea
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8
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Kang S, Im C, Spanos I, Ham K, Lim A, Jacob T, Schlögl R, Lee J. Durable Nickel‐Iron (Oxy)hydroxide Oxygen Evolution Electrocatalysts through Surface Functionalization with Tetraphenylporphyrin. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202214541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sinwoo Kang
- GIST: Gwangju Institute of Science and Technology School of Earth Sciences and Environmental Engineering KOREA, REPUBLIC OF
| | - Changbin Im
- University of Ulm: Universitat Ulm Institut fuer Electrochemie GERMANY
| | - Ioannis Spanos
- Max-Planck-Institute for Chemical Energy Conversion: Max-Planck-Institut fur chemische Energiekonversion Department of Heterogeneous Reactions GERMANY
| | - Kahyun Ham
- GIST: Gwangju Institute of Science and Technology School of Earth Sciences and Environmental Engineering KOREA, REPUBLIC OF
| | - Ahyoun Lim
- Max-Planck-Institute for Chemical Energy Conversion: Max-Planck-Institut fur chemische Energiekonversion Department of Heterogeneous Reactions GERMANY
| | - Timo Jacob
- Ulm University: Universitat Ulm Institut fuer Electrochemie GERMANY
| | - Robert Schlögl
- FHI der MPG: Fritz-Haber-Institut der Max-Planck-Gesellschaft Department of Inorganic Chemistry GERMANY
| | - Jaeyoung Lee
- Gwangju institute of science and technology 1Ertl Center for Electrochemistry & Catalysis, 2School of Environmental Science Buk-gu 500-712 Gwangju KOREA, REPUBLIC OF
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Haase FT, Rabe A, Schmidt FP, Herzog A, Jeon HS, Frandsen W, Narangoda PV, Spanos I, Friedel Ortega K, Timoshenko J, Lunkenbein T, Behrens M, Bergmann A, Schlögl R, Roldan Cuenya B. Role of Nanoscale Inhomogeneities in Co 2FeO 4 Catalysts during the Oxygen Evolution Reaction. J Am Chem Soc 2022; 144:12007-12019. [PMID: 35767719 PMCID: PMC9284556 DOI: 10.1021/jacs.2c00850] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Spinel-type catalysts are promising anode materials for the alkaline oxygen evolution reaction (OER), exhibiting low overpotentials and providing long-term stability. In this study, we compared two structurally equal Co2FeO4 spinels with nominally identical stoichiometry and substantially different OER activities. In particular, one of the samples, characterized by a metastable precatalyst state, was found to quickly achieve its steady-state optimum operation, while the other, which was initially closer to the ideal crystallographic spinel structure, never reached such a state and required 168 mV higher potential to achieve 1 mA/cm2. In addition, the enhanced OER activity was accompanied by a larger resistance to corrosion. More specifically, using various ex situ, quasi in situ, and operando methods, we could identify a correlation between the catalytic activity and compositional inhomogeneities resulting in an X-ray amorphous Co2+-rich minority phase linking the crystalline spinel domains in the as-prepared state. Operando X-ray absorption spectroscopy revealed that these Co2+-rich domains transform during OER to structurally different Co3+-rich domains. These domains appear to be crucial for enhancing OER kinetics while exhibiting distinctly different redox properties. Our work emphasizes the necessity of the operando methodology to gain fundamental insight into the activity-determining properties of OER catalysts and presents a promising catalyst concept in which a stable, crystalline structure hosts the disordered and active catalyst phase.
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Affiliation(s)
- Felix Thomas Haase
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Anna Rabe
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 7 Universitätsstr., Essen 45141, Germany.,Inorganic Chemistry, Christian Albrechts University, 2 Max-Eyth-Straße, Kiel 24118, Germany
| | - Franz-Philipp Schmidt
- Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany.,Max Planck Institute for Chemical Energy Conversion, 34-36 Stiftstrasse, Mülheim an der Ruhr 45470, Germany
| | - Antonia Herzog
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Hyo Sang Jeon
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Wiebke Frandsen
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Praveen Vidusha Narangoda
- Max Planck Institute for Chemical Energy Conversion, 34-36 Stiftstrasse, Mülheim an der Ruhr 45470, Germany
| | - Ioannis Spanos
- Max Planck Institute for Chemical Energy Conversion, 34-36 Stiftstrasse, Mülheim an der Ruhr 45470, Germany
| | - Klaus Friedel Ortega
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 7 Universitätsstr., Essen 45141, Germany
| | - Janis Timoshenko
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Thomas Lunkenbein
- Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Malte Behrens
- Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 7 Universitätsstr., Essen 45141, Germany.,Inorganic Chemistry, Christian Albrechts University, 2 Max-Eyth-Straße, Kiel 24118, Germany
| | - Arno Bergmann
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
| | - Robert Schlögl
- Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany.,Max Planck Institute for Chemical Energy Conversion, 34-36 Stiftstrasse, Mülheim an der Ruhr 45470, Germany
| | - Beatriz Roldan Cuenya
- Department of Interface Science, Fritz Haber Institute of the Max Planck Society, 4-6 Faradayweg, Berlin 14195, Germany
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Stevens CJ, Spanos I, Vallechi A, McGhee J, Whittow W. 3D Printing of Functional Metal and Dielectric Composite Meta-Atoms. Small 2022; 18:e2105368. [PMID: 34989120 DOI: 10.1002/smll.202105368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/17/2021] [Indexed: 06/14/2023]
Abstract
In this report, a novel fabrication method, based on casting Field's metal inside dielectric molds made via fused deposition modeling, is presented. Fused deposition modeling (FDM) has become one of the most common rapid prototyping methods. Whilst it generally produces good quality mechanical structures in thermoplastics, few reliable methods have been demonstrated that produce good quality 3D electrically conductive structures. By using Field's metal to transform dielectric molds into conductive structures, nearly any continuous metal geometry buried within the polymer can be created, allowing for the realization of complex 3D architectures. A wide range of thermoplastic materials used in fused deposition modeling have been investigated, to identify the best candidates in terms of processing temperature, relative permittivity, and loss tangent. Experimental measurements and X-ray computer tomography scans are used to determine the quality of structures fabricated using this method. Based on these findings, functional metamaterials devices operating at 600-700 MHz with high Q-factors have been produced. This method shows potential to be incorporated into standard FDM setups and could be utilized for the fabrication of curved and 3D geometries.
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Affiliation(s)
| | - Ioannis Spanos
- Department of Engineering Science, Oxford University, Parks Road, Oxford, OX13 1PJ, UK
| | - Andrea Vallechi
- Department of Engineering Science, Oxford University, Parks Road, Oxford, OX13 1PJ, UK
| | - Jack McGhee
- School of Electronic, Electrical and Systems Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK
| | - William Whittow
- School of Electronic, Electrical and Systems Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK
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11
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Narangoda P, Spanos I, Masa J, Schlögl R, Zeradjanin AR. Electrocatalysis Beyond 2020: How to Tune the Preexponential Frequency Factor. ChemElectroChem 2022. [DOI: 10.1002/celc.202200008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Praveen Narangoda
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Ioannis Spanos
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Justus Masa
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Robert Schlögl
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- Fritz-Haber-Institut der Max-Planck Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Aleksandar R. Zeradjanin
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
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12
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Narangoda P, Spanos I, Masa J, Schlögl R, Zeradjanin AR. Electrocatalysis Beyond 2020: How to Tune the Preexponential Frequency Factor. ChemElectroChem 2022. [DOI: 10.1002/celc.202200021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Praveen Narangoda
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Ioannis Spanos
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Justus Masa
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Robert Schlögl
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- Fritz-Haber-Institut der Max-Planck Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Aleksandar R. Zeradjanin
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
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13
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Papakonstantinou G, Spanos I, Dam AP, Schloegl R, Sundmacher K. Electrochemical evaluation of the de-/re-activation of oxygen evolving Ir oxide. Phys Chem Chem Phys 2022; 24:14579-14591. [DOI: 10.1039/d2cp00828a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the influence of dynamic and stationary polarization on the deactivation of state-of-the-art IrOx catalysts is imperative for the design and operation of robust and efficient proton exchange membrane water...
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Affiliation(s)
- Praveen Narangoda
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Ioannis Spanos
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Justus Masa
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Robert Schlögl
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- Fritz-Haber-Institut der Max-Planck Gesellschaft Faradayweg 4–6 14195 Berlin Germany
| | - Aleksandar R. Zeradjanin
- Max Planck Institute for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
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15
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Zeradjanin AR, Narangoda P, Spanos I, Masa J, Schlögl R. Expanding the frontiers of hydrogen evolution electrocatalysis–searching for the origins of electrocatalytic activity in the anomalies of the conventional model. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138583] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Ding Y, Zhang L, Gu Q, Spanos I, Pfänder N, Wu KH, Schlögl R, Heumann S. Tuning of Reciprocal Carbon-Electrode Properties for an Optimized Hydrogen Evolution. ChemSusChem 2021; 14:2547-2553. [PMID: 33882184 PMCID: PMC8252440 DOI: 10.1002/cssc.202100654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/21/2021] [Indexed: 06/12/2023]
Abstract
Closing the material cycle for harmful and rare resources is a key criterion for sustainable and green energy systems. The concept of using scalable biomass-derived carbon electrodes to produce hydrogen from water was proposed here, satisfying the need for sustainability in the field of chemical energy conversion. The carbon electrodes exhibited not only water oxidation activity but also a strong self-oxidation when being used as anode for water splitting. The carbon oxidation, which is more energy-favorable, was intentionally allowed to occur for an improvement of the total current, thus enhancing the hydrogen production on the cathode side. By introducing different earth-abundant metals, the electrode could be well adjusted to achieve an optimized water/carbon oxidation ratio and an appreciable reactivity for practical applications. This promising methodology may become a very large driver for carbon chemistry when waste organic materials or biomass can be converted using its intrinsic energy content of carbon. Such a process could open a safe path for sub-zero CO2 emission control. The concept of how and which parameter of a carbon-based electrode can be optimized was presented and discussed in this paper.
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Affiliation(s)
- Yuxiao Ding
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Liyun Zhang
- Qufu Normal University57 Jingxuan West RoadQufu273165P. R. China
| | - Qingqing Gu
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Ioannis Spanos
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Norbert Pfänder
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Kuang Hsu Wu
- School of Chemical EngineeringUniversity of New South Wales KensingtonSydneyNSW2052Australia
| | - Robert Schlögl
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
- Fritz-Haber-Institut der Max-Planck GesellschaftFaradayweg 4–614195BerlinGermany
| | - Saskia Heumann
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
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17
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Spanos I, Vangelatos Z, Grigoropoulos C, Farsari M. Design and Characterization of Microscale Auxetic and Anisotropic Structures Fabricated by Multiphoton Lithography. Nanomaterials (Basel) 2021; 11:446. [PMID: 33578774 PMCID: PMC7916458 DOI: 10.3390/nano11020446] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/03/2021] [Accepted: 02/07/2021] [Indexed: 12/31/2022]
Abstract
The need for control of the elastic properties of architected materials has been accentuated due to the advances in modelling and characterization. Among the plethora of unconventional mechanical responses, controlled anisotropy and auxeticity have been promulgated as a new avenue in bioengineering applications. This paper aims to delineate the mechanical performance of characteristic auxetic and anisotropic designs fabricated by multiphoton lithography. Through finite element analysis the distinct responses of representative topologies are conveyed. In addition, nanoindentation experiments observed in-situ through scanning electron microscopy enable the validation of the modeling and the observation of the anisotropic or auxetic phenomena. Our results herald how these categories of architected materials can be investigated at the microscale.
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Affiliation(s)
- Ioannis Spanos
- Department of Engineering Science, University of Oxford, Oxford OX1 4BH, UK;
- Nonlinear Lithography Laboratory, Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), 70013 Heraklion, Crete, Greece
| | - Zacharias Vangelatos
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA; (Z.V.); (C.G.)
| | - Costas Grigoropoulos
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA; (Z.V.); (C.G.)
| | - Maria Farsari
- Nonlinear Lithography Laboratory, Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology, Hellas (FORTH), 70013 Heraklion, Crete, Greece
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18
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Spanos I, Masa J, Zeradjanin A, Schlögl R. The Effect of Iron Impurities on Transition Metal Catalysts for the Oxygen Evolution Reaction in Alkaline Environment: Activity Mediators or Active Sites? Catal Letters 2020. [DOI: 10.1007/s10562-020-03478-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractThere is an ongoing debate on elucidating the actual role of Fe impurities in alkaline water electrolysis, acting either as reactivity mediators or as co-catalysts through synergistic interaction with the main catalyst material. This perspective summarizes the most prominent oxygen evolution reaction (OER) mechanisms mostly for Ni-based oxides as model transition metal catalysts and highlights the effect of Fe incorporation on the catalyst surface in the form of impurities originating from the electrolyte or co-precipitated in the catalyst lattice, in modulating the OER reaction kinetics, mechanism and stability.
Graphic Abstract
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19
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Ruiz Esquius J, Algara-Siller G, Spanos I, Freakley SJ, Schlögl R, Hutchings GJ. Preparation of Solid Solution and Layered IrOx–Ni(OH)2 Oxygen Evolution Catalysts: Toward Optimizing Iridium Efficiency for OER. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03866] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan Ruiz Esquius
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Gerardo Algara-Siller
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Ioannis Spanos
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mulheim an der Ruhr, Germany
| | - Simon J. Freakley
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 2AY, U.K
| | - Robert Schlögl
- Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mulheim an der Ruhr, Germany
| | - Graham J. Hutchings
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
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Antonyshyn I, Barrios Jiménez AM, Sichevych O, Burkhardt U, Veremchuk I, Schmidt M, Ormeci A, Spanos I, Tarasov A, Teschner D, Algara‐Siller G, Schlögl R, Grin Y. Al 2 Pt for Oxygen Evolution in Water Splitting: A Strategy for Creating Multifunctionality in Electrocatalysis. Angew Chem Int Ed Engl 2020; 59:16770-16776. [PMID: 32441451 PMCID: PMC7539922 DOI: 10.1002/anie.202005445] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/12/2020] [Indexed: 01/08/2023]
Abstract
The production of hydrogen via water electrolysis is feasible only if effective and stable catalysts for the oxygen evolution reaction (OER) are available. Intermetallic compounds with well-defined crystal and electronic structures as well as particular chemical bonding features are suggested here to act as precursors for new composite materials with attractive catalytic properties. Al2 Pt combines a characteristic inorganic crystal structure (anti-fluorite type) and a strongly polar chemical bonding with the advantage of elemental platinum in terms of stability against dissolution under OER conditions. We describe here the unforeseen performance of a surface nanocomposite architecture resulting from the self-organized transformation of the bulk intermetallic precursor Al2 Pt in OER.
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Affiliation(s)
- Iryna Antonyshyn
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Ana M. Barrios Jiménez
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Olga Sichevych
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Igor Veremchuk
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Alim Ormeci
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
| | - Ioannis Spanos
- Max-Planck-Institut für Chemische EnergiekonversionStiftstraße 34–3645470Mülheim an der RuhrGermany
| | - Andrey Tarasov
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614195BerlinGermany
| | - Detre Teschner
- Max-Planck-Institut für Chemische EnergiekonversionStiftstraße 34–3645470Mülheim an der RuhrGermany
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614195BerlinGermany
| | | | - Robert Schlögl
- Max-Planck-Institut für Chemische EnergiekonversionStiftstraße 34–3645470Mülheim an der RuhrGermany
- Fritz-Haber-Institut der Max-Planck-GesellschaftFaradayweg 4–614195BerlinGermany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester StoffeNöthnitzer Str. 4001187DresdenGermany
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Zeradjanin AR, Spanos I, Masa J, Rohwerder M, Schlögl R. Perspective on experimental evaluation of adsorption energies at solid/liquid interfaces. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04815-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractAlmost 15 years ago, first papers appeared, in which the density functional theory (DFT) was used to predict activity trends of electrocatalytic reactions. That was a major contribution of computational chemistry in building the theory of electrocatalysis. The possibility of computational electrocatalyst design had a massive impact on the way of thinking in modern electrocatalysis. At the same time, substantial criticism towards popular DFT models was developed during the years, due to the oversimplified view on electrified interfaces. Having this in mind, this work proposes an experimental methodology for quantitative description of adsorption energies at solid/liquid interfaces based on the Kelvin probe technique. The introduced approach already gives valuable trends in adsorption energies while in the future should evolve into an additional source of robust values that could complement existing DFT results. The pillars of the new methodology are established and verified experimentally with very promising initial results.
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22
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Antonyshyn I, Barrios Jiménez AM, Sichevych O, Burkhardt U, Veremchuk I, Schmidt M, Ormeci A, Spanos I, Tarasov A, Teschner D, Algara‐Siller G, Schlögl R, Grin Y. Al
2
Pt für die Sauerstoffentwicklungsreaktion bei der Wasserspaltung: eine Strategie zur Erzeugung von Multifunktionalität in der Elektrokatalyse. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Iryna Antonyshyn
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Ana M. Barrios Jiménez
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Olga Sichevych
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Ulrich Burkhardt
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Igor Veremchuk
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Marcus Schmidt
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Alim Ormeci
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
| | - Ioannis Spanos
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
| | - Andrey Tarasov
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Detre Teschner
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Gerardo Algara‐Siller
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Robert Schlögl
- Max-Planck-Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe Nöthnitzer Straße 40 01187 Dresden Deutschland
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Spanos I, Tesch MF, Yu M, Tüysüz H, Zhang J, Feng X, Müllen K, Schlögl R, Mechler AK. Facile Protocol for Alkaline Electrolyte Purification and Its Influence on a Ni–Co Oxide Catalyst for the Oxygen Evolution Reaction. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01940] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ioannis Spanos
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Marc F. Tesch
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Mingquan Yu
- Department of Heterogeneous Catalysis and Sustainable Energy, Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Harun Tüysüz
- Department of Heterogeneous Catalysis and Sustainable Energy, Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Jian Zhang
- Department of Chemistry and Food Chemistry, Center for Advancing Electronics, Zellescher Weg 19, 01069 Dresden, Germany
| | - Xinliang Feng
- Department of Chemistry and Food Chemistry, Center for Advancing Electronics, Zellescher Weg 19, 01069 Dresden, Germany
| | - Klaus Müllen
- Department of Synthetic Chemistry, Max Planck Institute for Polymer Research Ackermannweg 10, 55128 Mainz, Germany
| | - Robert Schlögl
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
- Department of Inorganic Chemistry, Fritz-Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
| | - Anna K. Mechler
- Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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Spanos I, Auer AA, Neugebauer S, Deng X, Tüysüz H, Schlögl R. Standardized Benchmarking of Water Splitting Catalysts in a Combined Electrochemical Flow Cell/Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES) Setup. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00632] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ioannis Spanos
- Department
of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, Muelheim
an der Ruhr, 45470, Germany
| | - Alexander A. Auer
- Department
of Molecular Theory and Spectroscopy, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, Muelheim an der Ruhr, 45470, Germany
| | - Sebastian Neugebauer
- Department
of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, Muelheim
an der Ruhr, 45470, Germany
| | - Xiaohui Deng
- Department
of Heterogeneous Catalysis and Sustainable Energy, Max Planck Institute für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Muelheim an der Ruhr, 45470, Germany
| | - Harun Tüysüz
- Department
of Heterogeneous Catalysis and Sustainable Energy, Max Planck Institute für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Muelheim an der Ruhr, 45470, Germany
| | - Robert Schlögl
- Department
of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, Muelheim
an der Ruhr, 45470, Germany
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Metochis CP, Spanos I, Auchinachie N, Crampton VO, Bell JG, Adams A, Thompson KD. The effects of increasing dietary levels of soy protein concentrate (SPC) on the immune responses and disease resistance (furunculosis) of vaccinated and non-vaccinated Atlantic salmon (Salmo salar L.) parr. Fish Shellfish Immunol 2016; 59:83-94. [PMID: 27742588 DOI: 10.1016/j.fsi.2016.10.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 09/26/2016] [Accepted: 10/10/2016] [Indexed: 06/06/2023]
Abstract
Juvenile salmon, with an initial weight of 9 g, were fed three experimental diets, formulated to replace 35 (SPC35), 58 (SPC58) and 80 (SPC80) of high quality fishmeal (FM) with soy protein concentrate (SPC) in quadruplicate tanks. Higher dietary SPC inclusion was combined with increased supplementation of methionine, lysine, threonine and phosphorus. The experiment was carried out for 177 days. On day 92 salmon in each tank were bulk weighed. Post weighing eighty salmon from each tank were redistributed in two sets of 12 tanks. Salmon from the first set of tanks were vaccinated, while the second group was injected with phosphate buffer saline (PBS). Salmon were sampled on day 92 (pre-vaccination), day 94 (2 days post vaccination [dpv]/PBS injection [dpPBSinj]) and day 154 (62 dpv/dpPBSinj) of the trial for the assessment of their immune responses, prior to the performance of salmon bulk weights for each tank. On day 154, fish from each tank were again bulk weighed and then seventeen salmon per tank were redistributed in two sets of twelve tanks and intra-peritoneally infected with Aeromonas salmonicida. At Day 154, SPC80 demonstrated lower performance (weight gain, specific growth rate and thermal growth coefficient and feed conversion ratio) compared to SPC35 salmon. Reduced classical and total complement activities for salmon fed diets with over 58% of protein from SPC, were demonstrated prior to vaccination. Reduced alternative complement activity was detected for both SPC58 and SPC80 salmon at 2 dpv and for the SPC80 group at 62 dpv. Total and classical complement activities demonstrated no differences among the dietary groups after vaccination. Numerical increases in classical complement activity were apparent upon increased dietary SPC levels. Increased phagocytic activity (% phagocytosis and phagocytic index) was exhibited for the SPC58 group compared to SPC35 salmon at 62 dpPBSinj. No differences in serum lysozyme activity, total IgM, specific antibodies, protein, glucose and HKM respiratory burst were detected among the dietary groups at any timepoint or state. Mortalities as a result of the experimental infection only occurred in PBS-injected fish. No differences in mortality levels were demonstrated among the dietary groups. SPC58 diet supported both good growth and health in juvenile Atlantic salmon while SPC80 diet did not compromise salmon' immunity or resistance to intraperitoneally inflicted furunculosis.
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Affiliation(s)
- Christoforos P Metochis
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK.
| | - I Spanos
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK
| | - N Auchinachie
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK
| | | | - J G Bell
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK
| | - A Adams
- Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, Scotland, UK
| | - K D Thompson
- Moredun Research Institute, Pentlands Science Park, Bush Loan, Penicuik, UK
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Spanos I, Dideriksen K, Kirkensgaard JJK, Jelavic S, Arenz M. Structural disordering of de-alloyed Pt bimetallic nanocatalysts: the effect on oxygen reduction reaction activity and stability. Phys Chem Chem Phys 2015; 17:28044-53. [DOI: 10.1039/c4cp04264f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We show how alloying and excessive de-alloying affect ORR activity and the structural integrity of PEMFC nanocatalysts.
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Affiliation(s)
- Ioannis Spanos
- Nano-science Center
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Knud Dideriksen
- Nano-science Center
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | | | - Stanislav Jelavic
- Nano-science Center
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
| | - Matthias Arenz
- Nano-science Center
- Department of Chemistry
- University of Copenhagen
- DK-2100 Copenhagen Ø
- Denmark
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Speder J, Zana A, Spanos I, Kirkensgaard JJ, Mortensen K, Arenz M. On the influence of the Pt to carbon ratio on the degradation of high surface area carbon supported PEM fuel cell electrocatalysts. Electrochem commun 2013. [DOI: 10.1016/j.elecom.2013.06.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Kwon Y, Birdja Y, Spanos I, Rodriguez P, Koper MTM. Highly Selective Electro-Oxidation of Glycerol to Dihydroxyacetone on Platinum in the Presence of Bismuth. ACS Catal 2012. [DOI: 10.1021/cs200599g] [Citation(s) in RCA: 212] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Youngkook Kwon
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Yuvraj Birdja
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Ioannis Spanos
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Paramaconi Rodriguez
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Marc T. M. Koper
- Leiden Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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Agalias A, Magiatis P, Skaltsounis AL, Mikros E, Tsarbopoulos A, Gikas E, Spanos I, Manios T. A new process for the management of olive oil mill waste water and recovery of natural antioxidants. J Agric Food Chem 2007; 55:2671-6. [PMID: 17348673 DOI: 10.1021/jf063091d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The high polyphenol content of the wastewater is the major environmental problem caused by the olive mills. A pilot scale system for the treatment of the olive oil mills wastewater was developed aiming at the recovery of high added value-contained polyphenols and the reduction of the environmental problems. The treatment system consists of three main successive sections: The first one includes successive filtration stages aiming at the gradual reduction of the wastewater suspended solids up to a limit of 25 microm. The second section includes passing of the filtered wastewater through a series of adsorbent resins (XAD16 and XAD7HP) in order to achieve the de-odoring and decolorization of the wastewater and the removal/ recovery of the polyphenol and lactone content. The third section of the procedure includes the thermal evaporation and recovery of the organic solvents mixture, which has been used in the resin regeneration process, and finally the separation of the polyphenols and other organic substance contents using fast centrifuge partition chromatography. The final outcome of the whole procedure is (i) an odorless yellowish wastewater with a 99.99% reduced content in polyphenols and 98% reduced COD, (ii) an extract rich in polyphenols and lactones with high antioxidant activity and high added value, (iii) an extract containing the coloring substances of the olive fruit, and (iv) pure hydroxytyrosol.
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Affiliation(s)
- Apostolis Agalias
- Laboratories of Pharmacognosy and Pharmaceutical Chemistry, School of Pharmacy, University of Athens, Panepistimiopolis Zografou, 157 71 Athens, Greece
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Kitsiou-Tzeli S, Giannatou E, Spanos I, Nicolaidou P, Fretzayas A, Tzetis M, Lazaris D, Kanavakis E, Tsezou A. Steroid hormones polymorphisms and cholelithiasis in Greek population. Liver Int 2007; 27:61-8. [PMID: 17241382 DOI: 10.1111/j.1478-3231.2006.01385.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND Genetic variation in genes involved in steroid biosynthesis, metabolism and signal transduction have been suggested to play a role in gallstone disease. METHODS To elucidate the possible role of genetic variation in the estrogen receptors alpha and beta (ER-alpha, ER-beta) and androgen receptor (AR) genes in breast cancer risk, the -1174(TA)n, c.1092+3607(CA)(n) and c.172(CAG)n repeat polymorphisms of the three genes were studied. A case-control cohort of 99 patients with cholelithiasis and 179 controls were used. RESULTS No significant difference was observed in the frequency distribution of -1174(TA)(0-26) in the ER-alpha gene between patients and controls, while a significant difference was observed in the frequency distribution of repeat polymorphism c.1092+3607(CA)5-27 and c.172(CAG)5-32 in the ER-beta gene and AR gene, respectively (P< or =0.001 and P=0.05, respectively). A significant difference was observed in the repeat genotype distribution (SS, SL, LL) in the (CA)n of the ER-beta gene (P<0.0001) and in the (CAG)n of the AR gene (P< or =0.0001). A significantly decreased odds ratio for cholelithiasis risk was observed in individuals having the SL and LL genotype for ER-beta gene compared with SS genotype (OR=0.212; 95% CI 0.105-0.426; P<0.0001 and OR=0.042; 95% CI 0.018-0.097, respectively) and LL genotype for AR gene (OR=0.622; 95% CI 0.345-1.121; P=0.114 and OR=0.287; 95% CI 0.151-0.543, P<0.0001, respectively). This protective effect of SL and LL genotypes for ER-beta and LL for AR gene remained evident (P<0.0001 for all of them) even after adjustment for various risk factors. CONCLUSIONS In conclusion an association for cholelithiasis risk between short alleles for both c.1092+3607(CA)5-27 and c.172(CAG)5-32 repeat polymorphisms of the ER-beta and AR was found in individuals of Greek descent.
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Affiliation(s)
- S Kitsiou-Tzeli
- Medical School, Department of Medical Genetics, Athens, University of Athens, Greece.
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