A5037715958- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Graphene research and applications
- Carbon Nanotubes in Composites
- Ionic liquids properties and applications
- Advanced battery technologies research
- biodegradable polymer synthesis and properties
- Nanopore and Nanochannel Transport Studies
- Polydiacetylene-based materials and applications
- Polyoxometalates: Synthesis and Applications
- Ocular Surface and Contact Lens
- Adsorption and biosorption for pollutant removal
- Catalytic Processes in Materials Science
- Electrospun Nanofibers in Biomedical Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Graphene and Nanomaterials Applications
- Electrochemical Analysis and Applications
- Antimicrobial Peptides and Activities
- Iron oxide chemistry and applications
- Advanced Nanomaterials in Catalysis
- Extraction and Separation Processes
- Fiber-reinforced polymer composites
- Catalysis and Oxidation Reactions
Universidade Federal de Viçosa
2017-2024
Federal Center for Technological Education of Minas Gerais
2015-2023
Universidade Federal de Minas Gerais
2015-2018
This study aims to increase the knowledge on interactions that occur at electrode/electrolyte interface in carbon-based electric double-layer capacitors (EDLCs) when solvent-free ionic liquids are used as electrolytes. Many previous studies found literature conducted using theoretical approaches, and they unable model all variables complexity of an actual device with a complex carbon surface liquid (IL). Here, compatibility between imidazolium different materials—an activated (AC),...
In this article, a thermodynamic study of the methylene blue (MB) adsorption on carbon nanotubes (CNT), known model system, was carried out by using simple and rigorous experimental approach based isothermal titration calorimetry (ITC) experiments. Considering thermodynamics process, classical van't Hoff approximation provided endothermic values for ΔadsH0 while ITC measurements revealed that MB both unmodified acid-modified CNTs is an exothermic process. The parameters systems were obtained...
A hybrid SC prepared with mesoporous carbon as the negative electrode, LiFePO4 positive and a LiTFSI/imidazolium ionic liquid solution electrolyte is presented. The cell was conceived on basis that it offers all of safety features liquids (IL) LiFePO4, in addition to advantages high energy density device. Most performance hybrids so far reported literature employ aqueous or organic electrolytes, whereas studies cells based IL are still rare. Here, fundamental study conducted understand how...
In this article, we explore electrical double-layer capacitors (EDLCs) based on ionic liquids (IL), focusing their stability and efficiencies (Coulombic energetic). We analyze the conventional voltammetric methods to determine electrochemical window, pointing out that a simple analysis of Coulombic efficiency, under different current voltage conditions in galvanostatic experiments, has advantage being more representative for real cells, especially when studied together with energy...
Although traditionally high-surface area carbon materials have been considered as rigid structures with a disordered three dimensional (3D) network of graphite microdomains associated limited electrical conductivity (highly depending on the porous structure and surface chemistry), here we show for first time that this is not case activated prepared using harsh activation conditions (e.g., KOH activation). In these specific samples clear structural re-orientation can be observed upon...
In this work, we evaluate the effect of Ni-doping LiMn2O4 spinels, LiNixMn2–xO4 (0.01 ≤ x 0.10) on performance lithium-ion hybrid supercapacitors (Li-HSCs) based a mixture 1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMITFSI) ionic liquid (IL) as electrolyte mesoporous carbon anode. Although positive contribution metal doping insertion materials in electrochemical properties is known for Li-ion batteries, little...
The mechanism of operation a supercapacitor based on methylene blue (MB) as redox shuttle in cells containing activated carbon electrodes and aqueous electrolyte has been studied. Attention is focused the instability these molecules which can undergo secondary reactions that impact negatively cell, generating fluctuations its performance reducing cycling life. It demonstrated MB interacts strongly with carbons modifies their structure, decreasing resistance increasing energy density cell by...
Herein, we describe the synthesis, crystal structure, and electronic properties of {[K2(dmso)(H2O)5][Ni2(H2mpba)3]·dmso·2H2O}n (1) [Ni(H2O)6][Ni2(H2mpba)3]·3CH3OH·4H2O (2) [dmso = dimethyl sulfoxide; CH3OH methanol; H4mpba 1,3-phenylenebis(oxamic acid)] bearing [Ni2(H2mpba)3]2- helicate, hereafter referred to as {NiII2}. SHAPE software calculations indicate that coordination geometry all NiII atoms in 1 2 is a distorted octahedron (Oh) whereas environments for K1 K2 are Snub disphenoid J84...