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New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa...
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New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 12570

Special Issue Editors

Prof. Dr. Enrique Rodríguez-Castellón

E-Mail Website
Guest Editor
Departamento de Química Inorgánica, Universidad de Málaga, 29016 Málaga, Spain
Interests: nanoporous materials; combustion of VOCs; hydrodesulfurization (HDS); hydrodenitrogenation (HDN); hydrodeoxygenation (HDO)
Special Issues, Collections and Topics in MDPI journals
Prof. María Luisa López

E-Mail Website
Guest Editor
Universidad Complutense de Madrid, Madrid, Spain

Special Issue Information

Dear Colleagues,

This Special Issue is a tribute to the retired professors and researchers Prof. M. Luisa Veiga and Prof. Carlos Pico from the Universidad Complutense of Madrid, Spain. Both researchers have been dedicated to teaching and research in the field of Inorganic Materials.

They have both played an important role in Chemistry in Spain, and in this sense, Prof. Pico has been president of the Spanish Royal Society of Chemistry (RSEQ) and both Prof. Pico and Prof. Veiga were founding members of the Inorganic Chemistry Division, being part of the board of directors. Both professors have been active in both basic and applied research in the field of Inorganic Materials. Thus, the aim of this Special Issue, entitled “New and Old Inorganic Materials”, is to describe the most outstanding advances within this group of materials and their applications for energy, catalysis, adsorption, environmental chemistry, and other fields in which they are involved.

Prof. Dr. Enrique Rodríguez-Castellón
Prof. María Luisa López
Guest Editors

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Keywords

  • inorganic compounds
  • nanomaterials
  • advanced materials
  • nanostructured materials

Published Papers (6 papers)

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Research

18 pages, 7800 KiB  
Article
Revisiting the Decomposition Process of Tetrahydrate Co(II) Acetate: A Sample’s Journey through Temperature
by Daniel Gutiérrez-Martín, Aurea Varela, José M. González-Calbet, Emilio Matesanz and Marina Parras
Appl. Sci. 2022, 12(13), 6786; https://doi.org/10.3390/app12136786 - 04 Jul 2022
Cited by 5 | Viewed by 2278
Abstract
Cobalt oxides, CoO and Co3O4, were obtained from Co (II) acetate tetrahydrate. The thermal decomposition pathway of the starting product was followed by combining thermogravimetric analysis and in situ X-ray thermodiffraction. Under a nitrogen atmosphere, cobalt monoxide with Zn-blende [...] Read more.
Cobalt oxides, CoO and Co3O4, were obtained from Co (II) acetate tetrahydrate. The thermal decomposition pathway of the starting product was followed by combining thermogravimetric analysis and in situ X-ray thermodiffraction. Under a nitrogen atmosphere, cobalt monoxide with Zn-blende and rocksalt polymorphs could be obtained almost as single phases at 330 and 400 °C, respectively. In addition to these oxides, a Co (II) oxyacetate, Co3O(CH3COO)4, was stabilized as an intermediate phase. Under an air atmosphere, Co3O4 (spinel structure type) was obtained as the only final product. The involved phases in this thermal decomposition process were characterized with scanning and transmission electron microscopy (SEM and TEM, respectively). Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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11 pages, 1707 KiB  
Article
Effects of Tin and Sulfur Chemical Substitution on the Structural and Electrical Properties of CuCr2Se4 Selenospinel
by Paulina Valencia-Gálvez, Daniel Aravena, Patricia Barahona, Silvana Moris and Antonio Galdámez
Appl. Sci. 2022, 12(3), 1586; https://doi.org/10.3390/app12031586 - 01 Feb 2022
Viewed by 1364
Abstract
A series of CuCr2-xSnxS2.3Se1.7 and CuCr2-xSnxS1.7Se2.3 (x = 0.4, 0.6, and 1.0) compounds were prepared by solid-state reaction [...] Read more.
A series of CuCr2-xSnxS2.3Se1.7 and CuCr2-xSnxS1.7Se2.3 (x = 0.4, 0.6, and 1.0) compounds were prepared by solid-state reaction at a high temperature. Single-crystal X-ray diffraction analysis showed that CuCr1.1Sn0.9S2.3Se1.7 crystallizes in a spinel-type structure (cubic Fd3¯m space group). The others samples were also consistent with a spinel-type structure but through powder X-ray diffraction patterns and Rietveld refinements. The systems studies showed p-type semiconductor behavior with a carrier concentration per volume of approximately ~+1020 cm−3. The electrical conductivity, σ, showed tin-content dependence. The conductivity of CuCr2-xSnxS1.7Se2.3 increased from ~9.0 to ~17.0 S·cm−1 at room temperature (RT) for x = 0.4 and 0.6, respectively, and the magneto-resistance average value determined for CuCr2-xSnxS2.3Se1.7 and CuCr2-xSnxS1.7Se2.3 was approximately ~10−4 Ω (0.566 T, external magnetic field). DFT calculations revealed that the Cr centers concentrated most of the spin density. A smaller spin polarization featuring the opposite spin was observed for S/Se atoms. Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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13 pages, 4572 KiB  
Article
Influence of MnO2-Birnessite Microstructure on the Electrochemical Performance of Aqueous Zinc Ion Batteries
by María Luisa López, Inmaculada Álvarez-Serrano, David Agustin Giraldo, Paloma Almodóvar, Elena Rodríguez-Aguado and Enrique Rodríguez-Castellón
Appl. Sci. 2022, 12(3), 1176; https://doi.org/10.3390/app12031176 - 23 Jan 2022
Cited by 5 | Viewed by 1942
Abstract
KxMnO2 materials with birnessite-type structure are synthetized by two different methods which make it possible to obtain manganese oxides with different degrees of crystallinity. The XPS results indicate that the sample obtained at high temperature (KMn8) exhibits a lower oxidation [...] Read more.
KxMnO2 materials with birnessite-type structure are synthetized by two different methods which make it possible to obtain manganese oxides with different degrees of crystallinity. The XPS results indicate that the sample obtained at high temperature (KMn8) exhibits a lower oxidation state for manganese ions as well as a denser morphology. Both characteristics could explain the lower capacity value obtained for this electrode. In contrast, the sample obtained at low temperature (KMn4) or by hydrothermal method presents a manganese oxidation state close to 4 and a more porous morphology. Indeed, in this case higher capacity values are obtained. At current density of 30 mA g−1, the KMn8, KMn4, and HKMn samples display a capacity retention of 88, 82, and 68%, respectively. The higher capacity loss obtained for the HKMn compound could be explained considering that the incorporation of Zn2+ in the structure gives rise to the stabilization of a ZnMn2O4 spinel-type phase. This compound is obtained in the discharge process but remains in the charge stage. Thus, when this spinel-type phase is obtained the capacity loss increases. Moreover, the stabilization of this phase is more favorable at low current rates where 100% of retention for all samples, before 50 cycles, was observed. Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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14 pages, 1965 KiB  
Article
Steric, Activation Method and Solvent Effects on the Structure of Paddlewheel Diruthenium Complexes
by Patricia Delgado-Martínez, Luis Moreno-Martínez, Rodrigo González-Prieto, Santiago Herrero, José L. Priego and Reyes Jiménez-Aparicio
Appl. Sci. 2022, 12(3), 1000; https://doi.org/10.3390/app12031000 - 19 Jan 2022
Cited by 3 | Viewed by 1914
Abstract
Conventional heating and solvothermal synthetic methods (with or without microwave activation) have been used to study the reaction of o-, m- and p-methoxybenzoic acid with [Ru2Cl(μ-O2CMe)4]. The tetrasubstituted series [Ru2Cl(µ-O2CC [...] Read more.
Conventional heating and solvothermal synthetic methods (with or without microwave activation) have been used to study the reaction of o-, m- and p-methoxybenzoic acid with [Ru2Cl(μ-O2CMe)4]. The tetrasubstituted series [Ru2Cl(µ-O2CC6H4-R)4], with R = o-OMe, m-OMe and p-OMe, has been prepared by the three procedures. Depending on the synthetic method and the experimental conditions, three compounds have been isolated (1a, 1b, 1c) with the o-methoxybenzoate ligand. However, with the m- and p-methoxybenzoate ligands, only the complexes 2 and 3 have been obtained, respectively. Compound 1a, with stoichiometry [Ru2Cl(µ-O2CC6H4-o-OMe)4]n, shows a polymeric structure with the chloride ions bridging the diruthenium units to form linear chains. Compounds 2 and 3, with the same stoichiometry, predictably form zig-zag chains in accordance with their insolubility and their magnetic measurements. Compound 1b, [Ru2Cl(µ-O2CC6H4-o-OMe)4(EtOH)], is a discrete molecular species with a chloride ion and one ethanol molecule occupying the axial positions of the dimetallic unit. Compound 1c is a cation-anion complex, [Ru2(µ-O2CC6H4-o-OMe)4(MeOH)2][Ru2Cl2(µ-O2CC6H4-o-OMe)4]. The cationic complex has two solvent molecules at the axial positions whereas the anionic complex has two chloride ligands at these positions. Complexes have been characterized by elemental analyses, mass spectrometry and IR and UV-vis-NIR spectroscopies. A magnetic study of complexes 1a, 1b, 2 and 3 have also been carried out. The crystal structure of compounds 1b and 1c have been solved by single X-ray crystal methods. Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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13 pages, 5435 KiB  
Article
Assessing the Electrochemical Performance of Different Nanostructured CeO2 Samples as Anodes for Lithium-Ion Batteries
by Farah Lamara, Nedjemeddine Bounar, Benjamín Solsona, Francisco J. Llopis, María Pilar Pico, Daniel Alonso-Domínguez, María Luisa López and Inmaculada Álvarez-Serrano
Appl. Sci. 2022, 12(1), 22; https://doi.org/10.3390/app12010022 - 21 Dec 2021
Cited by 1 | Viewed by 2027
Abstract
In this work, six samples of CeO2 are successfully prepared by diverse synthesis routes leading to different microstructures regarding both morphology and particle size. The structural and microstructural characteristics presented by the samples and their influence on the electrochemical response of the [...] Read more.
In this work, six samples of CeO2 are successfully prepared by diverse synthesis routes leading to different microstructures regarding both morphology and particle size. The structural and microstructural characteristics presented by the samples and their influence on the electrochemical response of the prepared anodes are analyzed. In particular, the Ce-CMK3 sample, synthesized from a mesoporous carbon obtained through a CMK3 silica template, displays an enhanced electrochemical response. Thus, capacity values of ~220 mA h g−1 are obtained at a current rate of 0.155 A g−1 after 50 cycles and an excellent cyclability at intermediate current densities. On the other hand, it is observed that the capacity values are satisfactorily recovered at 0.31 A g−1, displaying ~100 mA h g−1 after 550 cycles and efficiencies close to 100%. The electrochemical performance is interpreted considering the microstructural peculiarities of this anode, which are deeply analyzed. Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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15 pages, 3936 KiB  
Article
Advantages of the Incorporation of Luffa-Based Activated Carbon to Titania for Improving the Removal of Methylene Blue from Aqueous Solution
by Souad Boumad, Antonia Infantes-Molina, Isabel Barroso-Martín, Elisa Moretti, Enrique Rodríguez-Castellón, María del Carmen Román-Martínez, María Ángeles Lillo-Ródenas and Naima Bouchenafa-Saib
Appl. Sci. 2021, 11(16), 7607; https://doi.org/10.3390/app11167607 - 19 Aug 2021
Cited by 5 | Viewed by 2106
Abstract
This research aims to study the possible improvement of methylene blue (MB) removal from aqueous solution by hybrid adsorbent-catalysts (AdsCats) prepared through the incorporation of activated carbon derived from Luffa cylindrica fibers (LAC) to TiO2 photocatalysts. LAC with a specific surface area [...] Read more.
This research aims to study the possible improvement of methylene blue (MB) removal from aqueous solution by hybrid adsorbent-catalysts (AdsCats) prepared through the incorporation of activated carbon derived from Luffa cylindrica fibers (LAC) to TiO2 photocatalysts. LAC with a specific surface area of 1170 m2/g was prepared by chemical activation with phosphoric acid at 500 °C. TiO2/LAC composites with 70 and 90 wt.% Degussa P25 titania content were prepared. The materials were characterized by N2 physical adsorption, XRD, FTIR, and XPS. The AdsCats displayed a very good dispersion of TiO2 over LAC, a surface area of close to 200 or 400 m2/g, depending on the composition, and high crystallinity, showing the presence of anatase and rutile phases. MB removal was studied in two different scenarios: under UV-light after reaching adsorption equilibrium, and under UV-light once the liquid effluent and the AdsCats were in contact. The MB removal by LAC has proved to be very efficient, highlighting the predominant role of adsorption over photodegradation. The prepared AdsCats have also been compared with their components. The results showed that TiLAC hybrids have superior photocatalytic performance than P25, showing TiLAC-7/3 90% MB removal with respect to the initial concentration just after 30 min of UV light irradiation for both studied scenarios. Full article
(This article belongs to the Special Issue New and Old Inorganic Materials, Prof Carlos Pico and M.Luisa Veiga Festschrifts)
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