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Zhang H, Wang MH, Ma KR, Li K, Misko VR, Yang W. First-principles Study of Point Defect Diffusion in CoMn2O4 Crystal. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Poojitha B, Shaji A, Badola S, Saha S. Spin–phonon coupling in ferrimagnet spinel CoMn 2O 4. J Chem Phys 2022; 156:184701. [DOI: 10.1063/5.0087770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Coupling of material properties provides new fundamental insights and possibilities toward multifunctional devices. The spinel structures display strong coupling between different order parameters, as a consequence, exhibiting many fascinating properties, such as multiferroicity and superconductivity. Here, we have investigated the structural, magnetic, and vibrational properties of mixed-spinel CoMn2O4 stabilized in distorted tetragonal structures as evidenced from x-ray diffraction measurements. Magnetization measurements reveal two ferrimagnetic phase transitions at 185 and 90 K. Raman scattering measurements reveal the renormalization of phonon parameters for a few phonon modes at low temperatures, arising from spin–phonon coupling. The obtained value for λS2 is ∼2 cm−1. The strength of spin–phonon coupling ( λ) is estimated according to the spins involved in the corresponding lattice vibrations and discussed.
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Affiliation(s)
- Bommareddy Poojitha
- Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India
| | - Aswin Shaji
- Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India
| | - Shalini Badola
- Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India
| | - Surajit Saha
- Department of Physics, Indian Institute of Science Education and Research, Bhopal 462066, India
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Blanchet MD, Heath JJ, Kaspar TC, Matthews BE, Spurgeon SR, Bowden ME, Heald SM, Issacs-Smith T, Kuroda MA, Comes RB. Electronic and structural properties of single-crystal Jahn-Teller active Co 1+x Mn 2-x O 4 thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:124002. [PMID: 33438585 DOI: 10.1088/1361-648x/abd573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Recent investigations on spinel CoMn2O4 have shown its potential for applications in water splitting and fuel cell technologies as it exhibits strong catalytic behavior through oxygen reduction reactivity. To further understand this material, we report for the first time the synthesis of single-crystalline Co1+x Mn2-x O4 thin films using molecular beam epitaxy. By varying sample composition, we establish links between cation stoichiometry and material properties using in-situ x-ray photoelectron spectroscopy, x-ray diffraction, scanning transmission electron microscopy, x-ray absorption spectroscopy, and spectroscopic ellipsometry. Our results indicate that excess Co ions occupy tetrahedral interstitial sites at lower excess Co stoichiometries, and become substitutional for octahedrally-coordinated Mn at higher Co levels. We compare these results with density functional theory models of stoichiometric CoMn2O4 to understand how the Jahn-Teller distortion and hybridization in Mn-O bonds impact the ability to hole dope the material with excess Co. The findings provide important insights into CoMn2O4 and related spinel oxides that are promising candidates for inexpensive oxygen reduction reaction catalysts.
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Affiliation(s)
- Miles D Blanchet
- Department of Physics, Auburn University, Auburn, AL 36849, United States of America
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Zaki A, Carrasco J, Bielsa D, Faik A. Tunable Redox Temperature of a Co 3-xMn xO 4 (0 ≤ x ≤ 3) Continuous Solid Solution for Thermochemical Energy Storage. ACS APPLIED MATERIALS & INTERFACES 2020; 12:7010-7020. [PMID: 31927944 DOI: 10.1021/acsami.9b14369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Heat-storage technologies are well suited to improve the energy efficiency of power plants and the recovery of process heat. A good option for high storage capacities, especially at high temperatures, is storing thermal energy by reversible thermochemical reactions. In particular, the Co3O4/CoO and Mn2O3/Mn3O4 redox-active couples are known to be very promising systems. However, cost and toxicity issues for Co oxides and the sluggish oxidation rate (leading to poor reversibility) for Mn oxide hinder the applicability of these single oxides. Considering, instead, binary Co-Mn oxide mixtures could mitigate the above-mentioned shortcomings. To examine this in detail, here, we combine first-principles atomistic calculations and experiments to provide a structural characterization and observe the thermal behavior of novel mixed-metal oxides based on cobalt/manganese metals with the spinel structure Co3-xMnxO4. We show that novel Co3-xMnxO4 phases indeed enhance the enthalpy of the redox reactions, facilitate reversibility, and mitigate energy losses when compared to pure metal oxide systems. Our results expand therefore the limited list of currently available thermochemical heat-storage materials and pave the way toward the implementation of tunable redox temperature materials for practical applications.
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Affiliation(s)
- Abdelali Zaki
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Javier Carrasco
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Daniel Bielsa
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
| | - Abdessamad Faik
- CIC Energigune , Albert Einstein 48 , 01510 Miñano , Álava , Spain
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Balasubramanian P, Balamurugan TST, Chen SM, Chen TW. Simplistic synthesis of ultrafine CoMnO 3 nanosheets: An excellent electrocatalyst for highly sensitive detection of toxic 4-nitrophenol in environmental water samples. JOURNAL OF HAZARDOUS MATERIALS 2019; 361:123-133. [PMID: 30176410 DOI: 10.1016/j.jhazmat.2018.08.070] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 08/18/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
Design and fabrication of cost effective analytical tools to monitor toxic organic emissions in eco system is of a great necessity. Nitrophenols are a class of widespread toxic organic pollutant lead to serious adverse effects in biosphere on its consumption. This article reports a high sensitive, cost effective, robust electrochemical sensor for 4-nitrophenol (4-NP) in environmental water samples. A novel sheet like CoMnO3 (CMO Ns) nanocatalyst was synthesized via oxalic acid assisted co-precipitation technique and employed as electrocatalyst for the high sensitive detection of 4-NP. The physiochemical properties of CMO Ns are studied in detail via XRD, FTIR, TEM, TGA, and XPS. TEM results reviled the protocol is an excellent way for synthesis of a uniformly distributed CMO Ns with lathery surface. Evident to the surface and other physiochemical studies the CMO Ns based sensor holds superior electrocatalytic activity towards 4-NP detection with excellent sensitivity (2.458 μA μM-1 cm-2) coupled with nanomolar detection (10 nm) limits. Moreover, the constructed sensor holds reliable long-term durability, good reproducibility, and excellent working stability. The practical applicability of the developed sensor was evaluated by determination of 4-NP in samples acquired from water resources with RSD ± 3.3%.
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Affiliation(s)
- Paramasivam Balasubramanian
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, ROC
| | - T S T Balamurugan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, ROC; Institute of Biochemical and Biomedical Engineering, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, ROC
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, ROC.
| | - Tse-Wei Chen
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Section 3, Chung-Hsiao East Road, Taipei, 106, Taiwan, ROC; Research and Development Center for Smart Textile Technology, National Taipei University of Technology, No. 1, Section 3, Zhongxiao East Road, Taipei, 106, Taiwan, ROC
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Kanižaj L, Androš Dubraja L, Torić F, Pajić D, Molčanov K, Wenger E, Jurić M. Dimensionality controlled by light exposure: 1D versus 3D oxalate-bridged [CuFe] coordination polymers based on an [Fe(C2O4)3]3− metallotecton. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00926d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The studied heterometallic [CuFe] compounds, based on an [Fe(C2O4)3]3− building block and containing a 3D network or 1D ladder-like chains, were synthesized depending on whether the test tube with the same reaction layers was exposed to daylight or not.
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Affiliation(s)
| | | | - Filip Torić
- Department of Physics
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | - Damir Pajić
- Department of Physics
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | | | - Emmanuel Wenger
- CRM2 CNRS
- UMR 7036
- Institut Jean Barriol
- Université de Lorraine
- Vandoeuvre-lès-Nancy
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Androš Dubraja L, Jurić M, Popović J, Pajić D, Krupskaya Y, Kataev V, Bűchner B, Žilić D. Magneto-structural correlations in oxalate-bridged Sr(ii)Cr(iii) coordination polymers: structure, magnetization, X-band, and high-field ESR studies. Dalton Trans 2018; 47:3992-4000. [DOI: 10.1039/c7dt04655c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Magneto-structural correlations in 1D oxalate-bridged Sr(ii)Cr(iii) coordination polymers with two crystallographically and magnetically non-equivalent Cr(iii) ions are studied by HF-ESR spectroscopy.
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Affiliation(s)
| | - M. Jurić
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
| | - J. Popović
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
| | - D. Pajić
- University of Zagreb
- Faculty of Science
- Department of Physics
- 10000 Zagreb
- Croatia
| | - Y. Krupskaya
- IFW Dresden
- Institute for Solid State Research
- D-01069 Dresden
- Germany
| | - V. Kataev
- IFW Dresden
- Institute for Solid State Research
- D-01069 Dresden
- Germany
| | - B. Bűchner
- IFW Dresden
- Institute for Solid State Research
- D-01069 Dresden
- Germany
| | - D. Žilić
- Ruđer Bošković Institute
- 10000 Zagreb
- Croatia
- IFW Dresden
- Institute for Solid State Research
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