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de Oliveira Neto JG, Viana JR, Lima ADDSG, Lopes JBO, Ayala AP, Lage MR, Stoyanov SR, dos Santos AO, Lang R. Assessing the Novel Mixed Tutton Salts K 2Mn 0.03Ni 0.97(SO 4) 2(H 2O) 6 and K 2Mn 0.18Cu 0.82(SO 4) 2(H 2O) 6 for Thermochemical Heat Storage Applications: An Experimental-Theoretical Study. Molecules 2023; 28:8058. [PMID: 38138548 PMCID: PMC10745892 DOI: 10.3390/molecules28248058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/17/2023] [Accepted: 11/19/2023] [Indexed: 12/24/2023] Open
Abstract
In this paper, novel mixed Tutton salts with the chemical formulas K2Mn0.03Ni0.97(SO4)2(H2O)6 and K2Mn0.18Cu0.82(SO4)2(H2O)6 were synthesized and studied as compounds for thermochemical heat storage potential. The crystallographic structures of single crystals were determined by X-ray diffraction. Additionally, a comprehensive computational study, based on density functional theory (DFT) calculations and Hirshfeld surface analysis, was performed to calculate structural, electronic, and thermodynamic properties of the coordination complexes [MII(H2O)6]2+ (MII = Mn, Ni, and Cu), as well as to investigate intermolecular interactions and voids in the framework. The axial compressions relative to octahedral coordination geometry observed in the crystal structures were correlated and elucidated using DFT investigations regarding Jahn-Teller effects arising from complexes with different spin multiplicities. The spatial distributions of the frontier molecular orbital and spin densities, as well as energy gaps, provided further insights into the stability of these complexes. Thermogravimetry, differential thermal analysis, and differential scanning calorimetry techniques were also applied to identify the thermal stability and physicochemical properties of the mixed crystals. Values of dehydration enthalpy and storage energy density per volume were also estimated. The two mixed sulfate hydrates reported here have low dehydration temperatures and high energy densities. Both have promising thermal properties for residential heat storage systems, superior to the Tutton salts previously reported.
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Affiliation(s)
- João G. de Oliveira Neto
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Jailton R. Viana
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Antonio D. da S. G. Lima
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Jardel B. O. Lopes
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Alejandro P. Ayala
- Department of Physics, Federal University of Ceará—UFC, Fortaleza 65455-900, CE, Brazil
| | - Mateus R. Lage
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
- Coordination of the Science and Technology Course, Federal University of Maranhão (UFMA), Campus Balsas, MA-140, km 04, Balsas 65800-000, MA, Brazil
| | - Stanislav R. Stoyanov
- Natural Resources Canada, CanmetENERGY Devon, 1 Oil Patch Drive, Devon, AB T9G 1A8, Canada
| | - Adenilson O. dos Santos
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Rossano Lang
- Institute of Science and Technology, Federal University of São Paulo—UNIFESP, São José dos Campos 12231-280, SP, Brazil
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Pacheco TS, Ludwig ZM, Oliveira VH, Barcelos ID, de Souza RL, Paiva EC, Martins MD, Marques FC, Andrade GFS, Ghosh S. Synthesis, Thermal Analysis, Spectroscopic Properties, and Degradation Process of Tutton Salts Doped with AgNO 3 or H 3BO 3. ACS OMEGA 2023; 8:17800-17808. [PMID: 37251174 PMCID: PMC10210023 DOI: 10.1021/acsomega.3c00622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 04/27/2023] [Indexed: 05/31/2023]
Abstract
In this work, we synthesized and studied the spectroscopic properties of (NH4)2(SO4)2Y(H2O)6 (Y = Ni, Mg) crystals doped with AgNO3 or H3BO3. These crystals constitute a series of hexahydrated salts known as Tutton salts. We investigated the influence of dopants on the vibrational modes of the tetrahedral ligands NH4 and SO4, octahedral complexes Mg(H2O)6 and Ni(H2O)6, and H2O molecules present in these crystals through Raman and infrared spectroscopies. We were able to identify bands that are attributed to the presence of Ag and B dopants, as well as band shifts caused by the presence of these dopants in the crystal lattice. A detailed study of the crystal degradation processes was performed by thermogravimetric measurements, where there was an increase in the initial temperature of crystal degradation due to the presence of dopants in the crystal lattice. Raman spectroscopy of the crystal residues after the thermogravimetric measurements helped us to elucidate the degradation processes occurring after the crystal pyrolysis process.
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Affiliation(s)
- Tiago S. Pacheco
- Department
of Physics, Federal University of Juiz de
Fora, Juiz de
Fora 36036-330, MG, Brazil
- Centro
Federal de Educação Tecnológica de Minas Gerais—Unidade
Curvelo, Curvelo 35790-636, MG, Brasil
| | - Zélia M.
C. Ludwig
- Department
of Physics, Federal University of Juiz de
Fora, Juiz de
Fora 36036-330, MG, Brazil
| | - Victor H. Oliveira
- Department
of Physics, Federal University of Juiz de
Fora, Juiz de
Fora 36036-330, MG, Brazil
| | - Ingrid D. Barcelos
- Brazilian
Synchrotron Light Laboratory (LNLS), Brazilian
Center for Research in Energy and Materials (CNPEM), Campinas 13083-970, SP, Brazil
| | - Rafael L. de Souza
- Centro
de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte 31270-901, MG, Brazil
- Federal
University of Vales do Jequitinhonha e Mucuri, Janaúba 39440-000, MG, Brazil
| | - Edinei C. Paiva
- Centro
de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte 31270-901, MG, Brazil
- Instituto
Federal do Norte de Minas Gerais-Campus Januária, Januária 39480-000, MG, Brazil
| | | | - Flavia C. Marques
- Department
of Chemistry, Federal University of Juiz
de Fora, Juiz de Fora 36036-330, MG, Brazil
| | - Gustavo F. S. Andrade
- Department
of Chemistry, Federal University of Juiz
de Fora, Juiz de Fora 36036-330, MG, Brazil
| | - Santunu Ghosh
- Brazilian
Center for Physical Research, CBPF, Rio de Janeiro 22290-180, RJ, Brazil
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