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Contribution to the understanding of the performance differences between commercial current collectors in Li–S batteries

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Journal of Energy Chemistry 2021年第11期30卷 295-306,I0007页

作者： A.Benitez F.Luna-Lama ACaballero E.Rodriguez-Castellon J.Morales dpto.química inorgánica e Ingeniería química Instituto Universitario de Nanoquímica(IUNAN)Universidad de Córdoba14071 CórdobaSpain dpto.de química inorgánica Cristalografía y MineralogíaFacultad de CienciasUniversidad de Málaga29071 MálagaSpain

Lithium–sulfur batteries have been recognised as highly promising next-generation batteries, due to their low cost and high theoretical energy density. despite numerous advances in this technology over the last decade, its commercialisation is still a challenge that has not yet been achieved. Many efforts have been made to improve the problems that these batteries present, mainly by investigating different cathode manufacturing strategies, testing novel Li anodes, new additives in the electrolytes, and modified separators or interlayers. However, the characteristics of the current collectors used in the preparation of the electrodes have been rarely addressed. Three commercial collectors are commonly used in basic research on Li–S batteries: Al foil, carbon coated Al foil (Al-C), and carbon paper (gas diffusion layer, GDL). In this work, a detailed study of the electrochemical response of these commercial collectors has been carried out. The tests were carried out on two S composites formed by carbons of a different natures, commercial carbon black and synthetic N-doped graphene. In addition, the S impregnation method was different, using either melt diffusion at 155 ℃ or ethylenediamine as S solvent, respectively. In both systems, the results were similar – the electrodes supported on GDL delivered higher specific capacities than those supported on Al and Al-C, with minimal differences between the two. Of the different collector properties examined to explain this behaviour, namely Al corrosion, electrical conductivities, surface-level composition, and surface texture, only the latter had a significant effect in the performance of GDL-based electrodes. SEM images revealed a rough and cracked surface formed by the agglomerated carbon particles that give rise to a complex pore system, predominantly consisting of macropores. All of these features are beneficial for a better anchoring of the active material on the collector surface, in addition to enhancing the wettabi

关键词： Current collector Carbon paper Aluminum foil Lithium–sulfur battery

Highly graphitized carbon nanosheets with embedded Ni nanocrystals as anode for Li-ion batteries

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Nano Research 2020年第1期13卷 86-94页

作者： Francisco Javier Soler-Piña Celia Hernández-Rentero Alvaro Caballero Julián Morales Enrique Rodríguez-Castellón Jesús Canales-Vázquez dpto.química inorgánica e Ingeniería química Instituto de Química Fina y NanoquímicaUniversidad de Córdoba14071CórdobaSpain dpto.química inorgánica Cristalografía y MineralogíaFacultad de CienciasUniversidad de Málaga29071MálagaSpain Instituto de Energías Renovables Universidad de Castilla-La ManchaPaseo de La Investigación 102071AlbaceteSpain

A C/Ni composite was prepared via thermal decomposition of a nickel oleate complex at 700℃,yielding disperse Ni nanocrystals with an average size of 20 nm,encapsulated by carbon nanosheets as deduced from transmission electron microscopy(TEM)images and confirmed from X-ray photoelectron spectroscopy(XPS).Furthermore,the X-ray diffraction pattern revealed a good ordering of the carbon layers,forced by the Ni encapsulation to adopt a bending *** the close interaction between the graphitized framework and the metallic nanoparticles we have studied the properties of the composite as an anode for Li-ion *** with other nanostructured synthetic carbons,this carbon composite has a low voltage hysteresis and a modest irreversible capacity value,properties that play a significant role in its behaviour as electrodes in full cell *** moderate rate values,0.25 C,the electrode delivers an average capacity value around 723 mAh·g^−1 on cycling,among the highest values so far reported for this carbon *** higher rate values,1 C,the average capacity values delivered by the cell on cycling decrease,around 205 mAh·g^−1,but it maintains good capacity retention,a coulombic efficiency close to 100%after the first cycles and recovery of the capacity values when the rate is restored from 3 to 0.1 C.

关键词： carbon nanosheets nickel nanoparticles anode lithium batteries

A new series of environment-friendly reddish inorganic pigments based on AFeO_(3)(A=Ln,y) with high NIR solar reflectance

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Journal of Materiomics 2021年第5期7卷 1061-1073页

作者： Maria Fortuño-Morte Pablo Serna-Gallén Héctor Beltrán-Mir Eloísa Cordoncillo departamento de química inorgánica y orgánica Universitat Jaume IAv.Sos Baynat s/n12071Castellóde la PlanaSpain

Environment-friendly pigments based on AFeO_(3)(A=La,Pr,Nd,Sm,Gd,Tb,y or yb)with high nearinfrared(NIR)reflectance were synthesised by a coprecipitation method at 1200℃.The Rietveld refinement analysis showed single-phase orthorhombic perovskite for all *** pigments,which showed reddish hues,offered good colour stability after mixing these pigments in powder form with siloxane transparent paint and two different *** powderepaint mixtures produced with GdFeO_(3),TbFeO_(3) and yFeO_(3) pigments have the highest NIR solar reflectance,reaching values of R=50%.The temperature shielding studies conducted using TbFeO_(3) pigmentepaint mixture for a roof coating yielded a reduction of 3.2℃ in comparison to a commercial ***,the glazes that were pigmented using GdFeO_(3),TbFeO_(3) and yFeO_(3) compositions also presented the most intense reddish colours.A study of the thermal and chemical stability of the pigment with the highest NIR solar reflectance showed good stability in both *** reddish pigments that were prepared can therefore be good candidates for use in different applications such as cool pigments or pigments for ceramic glazes at high temperatures.

关键词： High NIR reflectance Cool pigment Reddish pigment Environment-friendly Coprecipitation

Improvement in varistor properties of CaCu_(3)Ti_(1)O_(12) ceramics by chromium addition

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Journal of Materials Science & Technology 2020年第6期41卷 12-20页

作者： Edson Cezar Grzebielucka Joao Frederico Haas Leandro Monteiro Eder Carlos Ferreira de Souza Christiane Philippini Ferreira Borges AndréVitor Chaves de Andrade Eloísa Cordoncillo Héctor Beltrán-Mir Sandra Regina Masetto Antunes Programa Pós-Graduacao em química Aplicada Universidade Estadual de Ponta GrossaAv.Gen.Carlos Cavalcanti 474884.030-000Ponta GrossaParanáBrazil Programa de Pós-Graduacao em Ciências/Física Universidade Estadual de Ponta GrossaAv.Gen.Carlos Cavalcanti 474884.030-000Ponta GrossaParanáBrazil dpto.de química inorgánica y orgánica Universitat Jaume IAv.de Vicent Sos Baynats/n12071Castellón de la PlanaSpain

The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is *** based on the formula CaCu3Ti4-xCrxO12-σ(x = 0, 0.025, 0.050 and 0.075 mol%) are prepared by solid-state reaction. Pellets sintered at 1070℃ for 12 h are characterised by X-ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and impedance spectroscopy. Current densityelectric field, dielectric loss and permittivity measurements are also carried out. Rietveld refinement showed the substitution of Cr(Ⅲ) on the Ti(Ⅳ) site, with the maximum substitution for x = 0.025 mol%.The generation of electrical defects in the grain boundary region by chromium doping is responsible for increasing the electric breakdown field strength and nonlinearity coefficient at room temperature from 1723 V/cm and 5.29 for x = 0 mol% to 3431 V/cm and 8.16 for x = 0.025 mol%. This composition shows the greatest improvement in ceramic varistor parameters.

关键词： CCTO Structural analysis Impedance Varistor Rietveld

Robust hybrid bismuth perovskites as potential photocatalysts for overall water splitting

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Nano Research 2024年第5期17卷 4593-4601页

作者： Antonio J.Chacón-García Herme G.Baldovi Artem A.Babaryk Antonio Rodríguez-Diéguez Sergio Navalón yolanda Pérez Hermenegildo García Patricia Horcajada Advanced Porous Materials Unit IMDEA Energy InstituteAvda.Ramón y Cajal 328935 MóstolesMadridSpain departamento de química Universitat Politècnica de València46022 ValènciaSpain departamento química inorgánica Universidad de Granada1807GranadaSpain departamento de Biología y Geología Física y Química Inorgánica.ESCET.Universidad Rey Juan Carlos28933 MóstolesMadridSpain Instituto de tecnología química CSIC-UPV Universitat Politècnica de València(UPV)46022Spain

organic-inorganic hybrid perovskites have gained great attention as promising photocatalysts for hydrogen ***,due to their poor stability in water,the use of aqueous hydrohalic acid solutions is specifically required for an efficient hydrogen ***,three novel photoactive lead-free hybrid perovskites based on bismuth and triazolium cations(denoted as IEF-15,IEF-16,and IEF-17(IEF stands for IMdeA energy frameworks))were synthesized and fully characterized(structural,compositional,optical,etc.).Further,these solids were proposed as photocatalysts for the challenging gas phase overall water splitting(OWS)***,IEF-16 thin films exhibited a remarkable photocatalytic activity in both H_(2) and O_(2) evolution,as a consequence of its appropriate bandgap and energy-band alignment,achieving hydrogen evolution rates ofμmol·g_(H_(2))^(-)1846 and 360 after 24 h under ultraviolet-visible(UV-vis)irradiation or simulated solar irradiation,*** study additionally highlights the remarkable structural and photochemical stability of IEF-16 under different operational conditions(*** volume,irradiation and temperature),paving the way for green hydrogen production from OWS using perovskite-based photocatalysts.

关键词： bismuth-based hybrid perovskites thin films photocatalysis overall water splitting green hydrogen

Regulatory effects of miR-19a on MAD2 expression and tumorigenesis in gastric cancer

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Genes & Diseases 2023年第4期10卷 1180-1182页

作者： J.Bargiela-Iparraguirre J.M.Herrero N.Pajuelo-Lozano M.Perez R.Perona A.G.quiroga C.Calés I.Sanchez-Perez dpto.de Bioquímica.Fac.Medicina UAMMadrid 28029Spain Biomedical Research Institute of Madrid CSIC/UAMMadrid 28029Spain Cancer Stem Cell and Fibroinflammatory Microenvironment Group Chronic Diseases and Cancer Area 3-Instituto Ramón y Cajal de Investigación Sanitaria(IRYCIS)Madrid 28034Spain Unidad Asociada de Biomedicina UCLM-CSIC Madrid 28029 Spain CIBER for Rare Diseases(CIBERER) Instituto de Salud CarlosⅢ Madrid 28029Spain dpto.de Anatomía Histología y Neurociencia.Fac.Medicina UAMMadrid 28029Spain g Dpto.de Química Inorgánica Fac.Ciencias UAMMadrid 28049Spain

Gastric cancer(GC)is worldwide the sixth most diagnosed and third leading cause of cancer deaths,with poor and late prognosis,probably due to post-surgery adjuvant treatment resistance and lack of a thorough panel of prognostic *** have previously shown that mitotic arrest deficient 2(MAD2,encoded by MAD2L1),a key protein of the spindle assembly checkpoint,is relevant in GC cells;its interference impairs migration and growth,while its overexpression cor-relates with tumorigenesis.

关键词： MAD2 tumorigenesis Gastric

Changes in the redox status of the brain in an experimental glaucoma model

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BIOCELL 2016年第1期40卷 51-53页

作者： CLAUDIA G.REIdeS ROMINA M.LASAGNI VITAR AGUSTINA PEVERINI NATASHA S.JANEZIC AILEN G.HVOZDA ARANA SANDRA M.FERREIRA SUSANA F.LLESUy química General e inorgánica Facultad de Farmacia y Bioquímica.Universidad de Buenos AiresBuenos Aires Argentina Instituto de Bioquímica y Medicina Molecular(IBIMOL) Universidad de Buenos Aires-CONICETBuenos AiresArgentina

The purpose of this study was to evaluate the redox status changes of primary visual targets in the rat brain of a high pressure-induced glaucoma *** animal model consisted of inducing ocular hypertension by cauterizing two episcleral veins on the left *** markers of oxidative damage and the oxidative balance evaluated in the brain seven days postoperative were:nitrites concentration,levels of non-enzymatic antioxidants and antiox-idant enzymes *** increase in the nitrite content,which could be the result of the enhancement in the production of nitrogen species,and in the activity of NADPH oxidase in the glaucoma group could lead to an increase on lipid and protein *** decrease on the non-enzymatic antioxidants and the compensatory increase of the superoxide dismutase and glutathione peroxidase activities could be a consequence of the increase of oxidative *** decrease in the activity of glutathione reductase leads to a decrease in the recycling of thiol *** suggest that oxidative stress can possibly acts as a risk factor for neurodegeneration in the ***-tic strategies to stop the progression of the disease in glaucoma should also be considered the central neuronal degeneration beyond the retina and the optic nerve.

关键词： oxidative damage antioxidants central nervous system neurodegenerative diseases

Low-cost disordered carbons for Li/S batteries： A high- performance carbon with dual porosity derived from cherry pits

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Nano Research 2018年第1期11卷 89-100页

作者： Celia Hernandez-Rentero Rafael Cordoba Noelia Moreno Alvaro Caballero Julian Morales Mara Olivares-Marin Vicente Gomez-Serrano dpto. Ouimica inorgdnica e Ingenierfa quimica Instituto de Quimica Fina y Nanoqufmica Universidad de C6rdoba 14071 C6rdoba Spain dpto. quimica inorg6nica Facultad de Ciencias Universidad de Extremadura 06006 Badajoz Spain

A micro- and mesoporous carbon obtained from cherry pit waste and activated with HBPO4 acid has been studied as the sulfur host for Li/S batteries. The carbon has a high specific surface area of 1,662 m2·g-1 （SBET） and micropore and mesopore volumes of 0.57 and 0.40 cm3·g-1, respectively. The S/C composite, with a sulfur content of 57% deposited by the disproportionate reaction of a SaO2- solution in an acid medium without an additional heating step above the S melting point, delivers an initial specific capacity of 1,148 mah·g-1 at a current of C/16. It also has a high capacity retention of 915 mAh·g-1 after 100 cycles and a Coulombic efficiency close to 100%. The good performance of the composite was also observed under higher current rates and long-term cycling tests. The capacities delivered by the cell after 200 cycles were 707 and 410 mAh·g-1 at C/2 and 1C （1C = 1,675 mA·g-1）, respectively, maintaining the high Coulombic efficiency. The overall electrochemical response of this carbon as the sulfur matrix is among the best reported so far among the other biomass-derived carbons, probably because of the micro- and mesopore system formed upon activation.

关键词： activated carbon agricultural waste cherry stone sulfur composite lithium-sulfur batteries

Ca-based materials derived from calcined cigarette butts for CO_(2)capture and thermochemical energy storage

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Journal of Environmental Sciences 2024年第6期140卷 230-241页

作者： Nabil Amghar Virginia Moreno Pedro E.Sánchez-Jiménez Antonio Perejón Luis A.Pérez-Maqueda Instituto de Ciencia de Materiales de Sevilla C.S.I.C.-Universidad de SevillaC.Américo Vespucio4941092 SevillaSpain Instituto de Tecnología de Materiales(ITM) Universitat Politècnica de València(UPV)Plaza Ferrándiz y Carbonell 1AlcoyAlicante 03801Spain departamento de química inorgánica Facultad de QuímicaUniversidad de Sevilla41012 SevillaSpain

Cigarette butts(CBs)are one of the most common types of litter in the *** to the toxic substances they contain,the waste generated poses a harmful risk to the environment,and therefore there is an urgent need for alternative solutions to landfill ***,this work presents a possible revalorization of this waste material,which implies interesting environmental *** were used as sacrificial templates for the preparation of CaO-based materials by impregnation with calcium and magnesium nitrates followed by flaming *** materials presented enhanced porosity for their use in the Calcium Looping process applied either to thermochemical energy storage or CO_(2)capture *** influence of the concentration of Ca and Mg in the impregnating solutions on the multicycle reactivity of the samples was *** improved multicycle performance was obtained in terms of conversion for both applications.

关键词： Cigarette butts Calcium-Looping CO_(2)Capture Thermochemical energy storage