Renato Gonçalves

Renato Gonçalves
University of Minho · Centro de Química

Phd

About

84
Publications
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1,676
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Publications

Publications (84)
Article
In order to improve the multifunctionality of polymer composites for advanced applications a novel tri-composite material is presented based on the inclusion of MFI zeolite and the ionic liquid (IL) 1-butyl-3-methylimidazolium thiocyanate ([BMIM][SCN]) in an electroactive poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) polymer matrix. T...
Article
Aiming to improve the sustainability of materials for lithium‐ion batteries (LIBs), this work reports on the development of novel membranes based on iota‐carrageenan biopolymer and their suitability as separator in LIBs applications. The membranes are prepared by freeze‐drying and its morphology, thermal, mechanical, and electrochemical properties...
Article
Lithium ion‐batteries (LIBs) are the most widely used devices in the area of electrical energy storage. However, several limitations regarding durability and safety are holding them back when it comes to larger applications, such as electric mobility. In this context, solid polymer electrolytes (SPEs) represent one of the most suitable options to o...
Article
Full-text available
Lithium-ion batteries (LIBs) are the most widely used energy storage system because of their high energy density and power, robustness, and reversibility, but they typically include an electrolyte solution composed of flammable organic solvents, leading to safety risks and reliability concerns for high-energy-density batteries. A step forward in Li...
Article
The use of metal-organic frameworks in the separator membrane of lithium-ion batteries is an interesting subject of study for the next generation of energy storage devices. In this work, different poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) / metal-organic framework (MOF) based separators were prepared using three distinct MOFs, and...
Article
Materials science is increasingly relying on sustainable methods for the synthesis of advanced materials. This work demonstrates the first template-free approach for the crystallization of tavorite, LiFePO4(OH), in the form of hollow microspheres and unique core (single crystal)–shell (aggregated particles) cross-like dendrites. The different morph...
Article
Full-text available
In order to address the environmental issues related to lithium-ion batteries, environmentally friendlier separators based on poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) membranes were prepared by electrospinning. Cobalt ferrite (CFO) fillers can be incorporated to improve the electrochemical properties of the membranes. It is shown that fiber...
Article
Lithium-ion batteries (LIBs) are the main energy storage system used in portable devices. Their outstanding characteristics allied to the growing market of portable devices and electric vehicles provides batteries an increasing trend over the next years. During the past decade, improved materials for LIBs have been developed, with less attention be...
Article
Natural polymers are a promising alternative for reducing the environmental impact of batteries. For this reason, it is still necessary to study their behavior and implement its use in these devices, especially in separator membranes. This work reports on new separator membranes based on silk fibroin (SF) and silk sericin (SS) prepared by salt leac...
Article
Energy and environmental issue are among the most relevant challenges to be solved in the near future. Electric vehicles (EVs) will play a key role in the solution by positively contribute to these two issues. The growth of the EV market both in Europe and the rest of the World in last years, arose a relevant question: to what extent are electric v...
Article
Considering the high levels of materials used in the fields of electronics and energy storage systems, it is increasingly necessary to take into consideration environmental impact. Thus, it is important to develop devices based on environmentally friendlier materials and/or processes, such as additive manufacturing techniques. In this work, poly(vi...
Article
Full-text available
Circular Economy In the context of circular economy concepts, the use/re-use of multifunctional materials emerges as a needed approach for a sustainable future. In article number 2100046, Carlos M. Costa, Senentxu Lanceros-Mendez, and co-workers, report on the development of hybrid PVDF-TrFE/TiO2 membranes for lithium-ion battery and photocatalytic...
Article
Full-text available
Lithium-ion batteries (LIBs) are currently the fastest growing segment of the global battery market, and the preferred electrochemical energy storage system for portable applications. Magnetism is one of the forces that can be applied improve performance, since the application of magnetic fields influences electrochemical reactions through variatio...
Article
Full-text available
Environmental issues related to energy consumption are mainly associated with the strong dependence on fossil fuels. To solve these issues, renewable energy sources systems have been developed as well as advanced energy storage systems. Batteries are the main storage system related to mobility, and they are applied in devices such as laptops, cell...
Article
Full-text available
Circular economy paradigms will benefit materials with multifunctional properties allowing to be implemented in more than one application, after processed, or in one application after already being used in another. In this context, membranes based on TiO2/Poly(vinylidene fluoride‐co‐trifluoroethylene) (PVDF‐TrFE) with different filler contents were...
Article
In order to improve battery performance by tuning battery separator membranes, this work reports on porous poly(vinylidene fluoride-co-trifluoroethylene) - P(VDF-TrFE)- membranes with surface pillar microstructures. Separators with tailored pillar diameter, height and bulk thickness were fabricated by template patterning and computer simulations, a...
Article
The increased demand of electronic devices promotes the development of advanced and more efficient energy storage devices, such as batteries. Lithium-ion batteries (LIBs) are the most studied battery systems due to their high performance. Among the different battery components, the separator allows the control of lithium ion diffusion between the e...
Article
Lithium-ion batteries, LIBs are ubiquitous through mobile phones, tablets, laptop computers and many other consumer electronic devices. Their increasing demand, mainly driven by the implementation of the electric vehicles, brings several environmental issues related to the mining, extraction and purification of scarce materials such as cobalt, nick...
Article
Full-text available
Increasing mobility, sensing, and interconnection needs is driving the need for low cost and environmental friendly energy storage systems, and therefore, printed batteries represent one of the most appealing solutions. To identify materials‐processing conditions–performance relationships to design improved screen‐printed batteries, the effects of...
Article
Metronidazole (MNZ) is a recalcitrant antibiotic with toxic and carcinogenic effects in aquatic environments. In this work, Fe5(PO4)4(OH)3·2H2O (giniite) particles were synthesised with three different alkaline cations (Li⁺, Na⁺ and K⁺) and used as Fenton catalysts for MNZ removal. It is shown that the addition of different cations during the hydro...
Article
The efforts to decarbonize the economies, with particular focus on renewable energies, must be accompanied by the development of more efficient and environmentally friendlier energy storage systems. In this context,...
Article
Poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene), P(VDF-TrFE-CFE), samples were prepared by solvent casting by varying polymer concentration and solvent evaporation temperature. Different sample morphologies were obtained depending on the processing conditions, as well as different physical-chemical properties such as degree of crys...
Conference Paper
A 3D cone separator geometry for lithium-ion batteries has been optimized taking into account the increase of radius size of one side. Theoretical simulations have been carried out for evaluating the influence of radius size in the cone structure at different discharge rates (1 C and 60 C) in which it was also determined the produced ohmic heat. Th...
Conference Paper
The battery separator is an essential component of batteries and affects their cycling performance. In this work, the effect of different 3D geometries of the battery separator on battery performance was studied keeping the same volume. It was observed that the different geometries affect the cycling performance, the best geometry being the perfora...
Article
Poly(vinylidene fluoride) (PVDF) and MOF-808-based separators for lithium-ion batteries (LIBs) have been prepared and fully characterized in terms of morphological and thermal properties, electrolyte uptake, and retention, and surface hydrophilic characteristics. The effect of PVDF/MOF-808 separators on the electrochemical performance of LIBs has b...
Article
Sustainable materials are increasingly needed in lithium ion batteries in order to reduce their environmental impact and improve their recyclability. This work reports on the production of separators using poly (L-lactic acid) (PLLA) for lithium ion battery applications. PLLA separators were obtained by solvent casting technique, by varying polymer...
Article
Electrospun poly(vinylidene fluoride) (PVDF) fiber membranes doped with different ionic liquids (ILs) and sharing the same anion were produced and their potential as separator membranes for battery applications was evaluated. Different types of ILs containing the same anion, bis(trifluoromethylsulfonyl)imide [TFSI]⁻, were used with IL concentration...
Article
Composite materials based on ionic liquids (ILs) / poly(vinylidene fluoride) (PVDF) and their copolymers have emerged as an interesting approach to develop high ionic conductivity solid polymer electrolytes (SPEs) for lithium-ion battery application. This work reports the development of SPEs based on fluoropolymers, PVDF and poly(vinylidene fluorid...
Article
The success of lithium ion batteries (LIBs) and their unique advantages for electrochemical energy storage have speed up research in this field. A critical component of LIBs is the separator. Here, Bombyx mori silk cocoon separators have been treated with oxygen (O2) and nitrogen (N2) plasmas at different exposure times. The goal was to improve the...
Article
The continuous advances in smart and multifunctional materials and the corresponding growth of the Internet of Things require novel battery concepts with improved integration in different substrates and devices, leading to more efficient energy storage devices with higher power and energy density. These new batteries can be obtained through printin...
Article
The search of natural materials for their application in energy storage systems in general and batteries in particular is growing due to their promising properties and the need of environmental sustainability. Silk fibroin (SF) is one of those materials due to their mechanical and thermal properties, non-toxicity and biocompatibility. Further, SF e...
Article
Cellulose emerges as a promising sustainable alternative to traditional polyolefin-based lithium-ion battery (LIB) separators thanks to its good mechanical properties and inherent hydrophilic character. Therefore, in this work we fabricate high specific surface area mesoporous cellulose nanocrystal (MCNC) membranes with different pore-morphology as...
Article
The increasing demand on electronic and portable devices requires battery system with improved energy storage capacity. Thus, studies in all battery components are being carried out to increase their performance. One of those battery components in the separator membrane. The present work reports on porous poly(vinylidene fluoride-co-trifluoroethyle...
Chapter
Energy resources, consumption, and management are among the most important issues of this century. Our dependence on fossil fuels should be changed by eco-friendlier renewable energies. Further, the generated electrical energy should be stored for improving mobile applications, being batteries the most used system for this purpose. Lithium-ion batt...
Article
The increasing use of electronic portable systems and the consequent energy demand, leads to the need to improve energy storage systems. According to that and due to safety issues, high-performance non-flammable electrolytes and solid polymer electrolytes (SPE) are needed. SPE containing different amounts of lithium bis(trifluoromethanesulfonyl)imi...
Article
In article number 1800098, Rui F. P. Pereira, Carlos M. Costa, Verónica de Zea Bermudez, Senentxu Lanceros‐Mendez, and co‐workers demonstrate the use of Bombyx mori silkworm cocoons as separators for the development of more sustainable advanced lithium‐ion batteries, supporting the next generation of environmentally friendly and safe energy storage...
Article
In the quest for solutions to enhance the safety and sustainability of energy storage devices, Bombyx mori silkworm cocoons are proposed as separators for lithium (Li)‐ion batteries obtained literally from nature, and employed directly in a device. The suitability of the cocoons is evaluated in Li‐ion batteries using two different electrolytes: a m...
Article
Printed electrodes were developed by screen-printing from ink formulation developed from a green solvent, a new polymer binder and a graphite (anode) or C-LiFePO4 (cathode). The morphological and electrochemical properties of the electrodes were investigated and compared to electrodes prepared with poly(vinylidene fluoride), PVDF, as a binder. The...
Article
Poly(vinylidene fluoride-trifluoroethylene), P(VDF-TrFE), microstructures have been produced using different solvents, including green ones, by different techniques, such as solvent casting, screen-printing, replica molding, electropray and electrospinning. The obtained microstructures span from simple porous and dense films, to spheres, fibers and...
Article
Poly(vinylidene fluoride) (PVDF) and its copolymers are the polymers with the highest dielectric constants and electroactive responses, including piezoelectric, pyroelectric and ferroelectric effects. This semicrystalline polymer can crystallize in five different forms, each related to a different chain conformation. Of these different phases, the...
Article
Battery separators based on silk fibroin (SF) have been prepared aiming at improving the environmental issues of lithium-ion batteries. SF materials with three different morphologies were produced: membrane films (SF-F), sponges prepared by lyophilization (SF-L) and electrospun membranes (SF-E). The latter materials presented a suitable porous thre...
Article
LiMn1.5Ni0.5O4 with spinel type of structure was synthesized by sol-gel method and doped by different rare-earth elements (Nd, Gd and Dy). It was found that the inclusion of rare-earth element preserves the cubic spinel structure, leads to smaller particle size and improves the cyclic performance of the produced batteries. The best battery performa...
Article
The synthetic analogue of the mineral giniite is a promising material for capture of phosphopeptides from complex tryptic digests, photocatalysis and cathode for lithium battery applications. In all these applications, the crystal morphology of giniite shows to be extremely important, however, the reported synthesis and crystal morphologies are sca...
Chapter
Polymer-based, low-scale magnetoelectric (ME) materials have been attracting increasing attention not only for novel phenomena associated with fundamental physics but also due to exciting application potential in micro- and nanoelectronic devices and in the biomedical field. Currently, most ME nanocomposite films and low-dimensional materials show...
Article
Lithium iron phosphate (LiFePO4) with olivine structure was prepared by mild hydrothermal method at variable time, temperature, source of lithium and sucrose content. The relations between synthesis parameters and the characteristics (phase purity, lattice volume and morphological relations) of the obtained iron olivine samples were studied by powd...
Article
β-Poly(vinylidene fluoride) (PVDF) is of large technological relevance due to its piezoelectric, pyroelectric and/ferroelectric properties. In this way, a variety of methods have been developed to obtain such electroactive β-phase, being the addition of fillers one of the most popular, upscalable and innovative methods. The electrostatic interactio...
Article
This work shows that it is possible to synthesize, chemically tailor and optimize the magnetostriction of ferrite nanoparticles and improve the magnetoelectric (ME) response of their multiferroic composites. Thus, Fe3O4 nanoparticles with different sizes have been synthesized by a solvothermal procedure and an oxidative hydrolysis method. The first...
Article
A drug release system is developed capable to modulate the drug release kinetics by the application of a magnetic field. Thus, this work reports on the production, characterization, and release kinetics of a poly(l-lactic acid) (PLLA) microporous membrane containing a zeolite (Faujasite) and a magnetic stimuli-sensitive component, magnetostrictive...
Article
Polymer composite membranes based on poly(vinylidene fluoride-hexafluoropropylene), PVDF-HFP, with different aluminum hydroxide filler content, bayerite polymorph, were prepared by solvent casting for arsenic removal from water by filtration and adsorption. Morphological, structural and mechanical characterization of the membranes were performed. T...
Article
Abstract Novel multifunctional porous films have been developed by the integration of magnetic CoFe2O4 (CFO) nanoparticles into poly(vinylidene fluoride)-Trifuoroethylene (P(VDF-TrFE)), taking advantage of the synergies of the magnetostrictive filler and the piezoelectric polymer. The porous films show a piezoelectric response with an effective d33...
Article
Full-text available
In the last years the fabrication of multifunctional composite materials like the mixture of piezoelectric polymers with magnetic/magnetostrictive nanoparticles to give as result magnetoelectric (ME) composites has received great effort [1]. P(VDF-TrFE), in the poled ferroelectric phase, exhibits one of the highest piezoelectric responses among pol...
Article
Magnetoelectric microspheres based on piezoelectric poly(vinylidene fluoride) and magnetrostrictive CoFe2O4 (CFO), a novel morphology for polymer-based ME material, have been developed by an electrospray process. The CFO nanoparticles content in the (3-7 µm diameter) microspheres reaches values up to 27 wt.%. The multiferroic microspeheres show a m...
Article
Magnetoelectric 0-1 composites comprising CoFe2O4 (CFO) nanoparticles in a polyvinylidene fluoride (PVDF) polymer-fibre matrix have been prepared by electrospinning. The average diameter of the electrospun composite fibres is ∼325 nm, independent of the nanoparticle content, and the amount of the crystalline polar β phase is strongly enhanced when...
Article
The use of polymer based magnetoelectric materials for sensing and actuation applications has been the subject of increasing scientific and technological interest. One of the drawbacks to be overcome in this field is to increase the temperature range of application above 100 °C. In this way, a nanocomposite material composed by a mixture of two aro...
Article
The development of new thermoplastic polymer-based piezoelectric sensors with filament geometry is described. These filaments are appropriate for integration into textiles and provide new possibilities in the design and development of low-cost flexible sensors produced at high rates. The developed three-layered piezoelectric monofilaments have been...
Article
Full-text available
Poly(vinylidene fluoride) (PVDF) microparticles have been produced by electrospraying as a suitable substrate for tissue engineering applications. The influence of the polymer solution concentration and processing parameters, such as electric field, flow rate and inner needle diameter, on microparticle size and distribution has been studied. Polyme...
Article
Different solvents were used for the preparation of poly(vinylidene fluoride), PVDF, and NaY zeolite composites by solvent casting and melt crystallization. Solvents like N,N-dimethylformamide (DMF), dimethylsulphoxide (DMSO) and triethyl phosphate (TEP) were chosen as they present different dielectric constants and can be encapsulated in the porou...
Article
Iron oxide magnetic nanoparticles (IOMNPs) with average size of ~ 15 nm, synthesized by a co-precipitation technique were included in a poly(vinylidene fluoride) (PVDF) matrix with the objective to produce IOMNPs/PVDF multiferroic nanocomposites by solvent casting and melt processing.Increasing concentration of the IOMNPs nucleates the piezoelectri...
Article
Polymer based composites of a-PVDF doped with different NaY zeolite (Na53Al53Si139O384) content were investigated. A good dispersion of NaY zeolite within the polymer matrix is achieved. The introduction of NaY nanoparticles enhance the storage modulus and the dielectric constant at room temperature. The dielectric constant at room temperature incr...
Article
The electroactive β-phase of poly(vinylidene fluoride) (PVDF) can be nucleated by introducing CoFe2O4 nanoparticles within the polymer matrix, leading to electroactive materials with large potential for sensor and actuator applications. The effects of the CoFe2O4 nanoparticle electrostatic charge on the phase crystallization of PVDF polymer is repo...