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Lopresti M, Kurowski Ł, Palin L, Milanesio M, Siedzielnik M, Gutmańska K, Dobrenko A, Klimczuk T, Pawelczyk E, Dołęga A. New heterometallic Co/Zn, Ag/Co, and Ag/Zn imidazolates: structural characterization and catalytic activity in the oxidation of organic compounds. Dalton Trans 2024; 53:2833-2847. [PMID: 38230705 DOI: 10.1039/d3dt03211f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Nanocrystalline powders of monometallic and bimetallic imidazolates of Co, Zn and Ag were produced by a reaction carried out in water. The powders were characterized by powder X-ray diffraction and the crystal structures of the new compounds Ag2ZnIm4 and Ag2CoIm4 (Im = imidazolate) were solved. Heterometallic Co/Zn imidazolates showed the known Zn-zni crystal structure while Ag/Zn and Ag/Co systems were isostructural to the copper analogs. The powders were further characterized by EDX, UV-Vis and FTIR ATR spectroscopy in the solid state. The catalytic experiments indicated that out of the studied heterometallic compounds only Ag2Co(Im)4 exhibits some catalytic activity in the oxidation reaction of 1-phenylethanol with tert-butylhydroperoxide at elevated temperatures.
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Affiliation(s)
- Mattia Lopresti
- Dipartimento di Scienze e Innovazione Tecnologica and CrisDi Interdepartmental Center for Crystallography, Università del Piemonte Orientale Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Łukasz Kurowski
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
| | - Luca Palin
- Dipartimento di Scienze e Innovazione Tecnologica and CrisDi Interdepartmental Center for Crystallography, Università del Piemonte Orientale Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Marco Milanesio
- Dipartimento di Scienze e Innovazione Tecnologica and CrisDi Interdepartmental Center for Crystallography, Università del Piemonte Orientale Viale T. Michel 11, 15121 Alessandria, Italy.
| | - Magdalena Siedzielnik
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
| | - Karolina Gutmańska
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
| | - Adriana Dobrenko
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
| | - Tomasz Klimczuk
- Faculty of Applied Physics and Mathematics and Advanced Materials Centre, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland
| | - Ewelina Pawelczyk
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
- Department of Process Engineering and Chemical Technology, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland
| | - Anna Dołęga
- Department of Inorganic Chemistry, Chemical Faculty, Gdansk University of Technology, Narutowicza St. 11/12, 80-233, Gdańsk, Poland.
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Kumar N, Sharma A, Rajput K, Kataria R, Mehta S. Cobalt-based co-ordination complex-derived nanostructure for efficient oxygen evolution reaction in acidic and alkaline medium. Heliyon 2022; 8:e10939. [PMID: 36247167 PMCID: PMC9562245 DOI: 10.1016/j.heliyon.2022.e10939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 08/13/2022] [Accepted: 09/29/2022] [Indexed: 11/06/2022] Open
Abstract
Electrochemical water splitting is one of the most important method for energy conversion and storage. For this, the design and development of a low-cost robust electrocatalyst are highly desirable. In this study, Cobalt-based electrocatalyst for Oxygen Evolution Reaction was synthesized by thermal treatment of Cobalt-dehydroacetic acid (Co-DHA). The as-synthesized Co nanostructures and Co-DHA crystals were characterized with powder X-ray diffraction, X-ray photoelectron spectroscopy thermo-gravimetric analysis, and field emission scanning electron microscopy. The electrochemical O2 evolution study shows the overpotential (at 10 mV/cm−2) correspond to 294 mV vs reference hydrogen electrode (RHE) for K-300 (Co3O4@300), whereas K-500 (Co3O4@500) shows 170 mV vs RHE values in 1 M KOH solution, respectively. Similar trends have been observed for electrochemical O2 evolution studies in 0.5 M H2SO4, where K-300 and K-500 shows the overpotential (at 10mV/cm−2) of 234 mV vs RHE, and 199 mV vs RHE, respectively. The outcomes show better catalytic efficiency of K-500 as compared to K-300. Simple one pot synthesis for precursor of Co3O4. Enhanced activity for oxygen evolution reaction. Efficient performance and stability in both acidic and alkaline medium.
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Affiliation(s)
- Naveen Kumar
- Department of Chemistry, Panjab University, Sector-14, Chandigarh, India
| | - Aashima Sharma
- Department of Chemistry, Panjab University, Sector-14, Chandigarh, India
| | - Kritika Rajput
- Department of Physics, Panjab University, Sector-14, Chandigarh, India
| | - Ramesh Kataria
- Department of Chemistry, Panjab University, Sector-14, Chandigarh, India
| | - S.K. Mehta
- Department of Chemistry, Panjab University, Sector-14, Chandigarh, India,Corresponding author.
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Kristensen LG, Amdisen MB, Skov LN, Jensen TR. Fast magnesium ion conducting isopropylamine magnesium borohydride enhanced by hydrophobic interactions. Phys Chem Chem Phys 2022; 24:18185-18197. [PMID: 35861397 DOI: 10.1039/d1cp05063j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
New materials for the next generation of electrochemical energy storage devices such as batteries are of extreme importance. Here we investigate the structure, ionic conductivity and thermal properties of isopropylamine magnesium borohydride based composites with different compositions, Mg(BH4)2·x(CH3)2CHNH2, x = 0.5, 0.9, 1.25, 1.5, 1.75, 2.5, 3.1. Three new compounds are discovered, x = 1, 2, and 3 and the monoclinic structure of Mg(BH4)2·2(CH3)2CHNH2 (P21/c) is investigated in detail. This structure consists of neutral complexes [Mg(BH4)2((CH3)2CHNH2)2] di-hydrogen bonded to form layers and these layers are connected by hydrophobic interactions via the isopropyl moieties. The orthorhombic unit cell of Mg(BH4)2·(CH3)2CHNH2 was also determined, a = 9.78, b = 12.17 and c = 17.24 Å. In general, the samples are thermally stable up to 50 °C where they started to become softer, and at 70 °C isopropylamine release and melting started. The highest Mg2+ ionic conductivity was that of Mg(BH4)2·1.5(CH3)2CHNH2, σ(Mg2+) = 2.7 × 10-4 S cm-1 at 45 °C, with an activation energy of EA = 1.22 eV. Furthermore, reversible stripping/plating of Mg was displayed at 45 °C, with an oxidative stability of 1.2 V vs. Mg/Mg2+. The addition of MgO nanoparticles (75 wt%) improves the mechanical and thermal stability, and decreases the activation energy, to EA = 0.56 eV. Thereby the Mg2+ conductivity is increased at low temperature. This suggests that the hydrophobic interactions contribute to the high ionic conductivity in the solid state, which opens a new avenue for design and discovery of electrolyte materials.
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Affiliation(s)
- Lasse G Kristensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
| | - Mads B Amdisen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
| | - Lasse N Skov
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
| | - Torben R Jensen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
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Bala I, Singh K, Kataria R, Sindhu M. Exploration of structural, electrostatic and photophysical behaviour of novel Ni (II), Cu (II) and Zn (II) complexes, and their utility as potent antimicrobial agents. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Indu Bala
- Department of Chemistry Kurukshetra University Kurukshetra Haryana India
| | - Kiran Singh
- Department of Chemistry Kurukshetra University Kurukshetra Haryana India
| | - Ramesh Kataria
- Department of Chemistry and Center of Advanced Studies in Chemistry Panjab University Chandigarh India
| | - Meena Sindhu
- Department of Microbiology, COBS&H CCS Haryana Agricultural University Hisar India
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