A5103168757- Advanced battery technologies research
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Conducting polymers and applications
- Advanced Battery Technologies Research
- Fuel Cells and Related Materials
- Multiferroics and related materials
- Electrocatalysts for Energy Conversion
- Seismic Waves and Analysis
- Hydrogen Storage and Materials
- Electrodeposition and Electroless Coatings
- Hybrid Renewable Energy Systems
- Ferroelectric and Piezoelectric Materials
- Molecular Junctions and Nanostructures
- Advanced Battery Materials and Technologies
Holon Institute of Technology
2024
Bar-Ilan University
2012-2021
Laboratoire Matériaux et Phénomènes Quantiques
2007
Université Paris Cité
2007
Laboratoire de physique des Solides
2007
Centre National de la Recherche Scientifique
2007
Micro-Raman spectroscopy has been used to study lattice dynamics associated with the ferroelectric domains of a BiFeO$_3$ single crystal at low temperature. The phonon assignment shows large frequency splitting between transverse and longitudinal components A$_1$ mode related Bi-O bonds in contrast thin films where is negligible. Applying an external electric field induces shifts energy modes bonds. These softenings are due tensile stress via piezoelectric effect. We give estimates...
Chemically prepared manganese dioxide (CMD), which is traditionally used as a cathode material for Li-ion batteries, was tested and characterized the first time positive electrode hybrid supercapacitors with two different aqueous electrolyte solutions (6 M KOH 0.5 K2SO4). The CMD electrodes exhibit distinct electrochemical characteristics that depend on solution used. show higher specific capacitance in basic solution, 137 F/g, at current density of 0.1 A/g. Asymmetric comprising activated...
Electrochemical capacitors, also called supercapacitors, are high power devices that exhibit moderate energy density. One interesting strategy to improve this latter parameter is the use of additional redox reactions can enhance double layer capacity carbon electrodes while maintaining rate capability. Diazonium chemistry a powerful tool for synthesizing carbonaceous materials with active sites over surface. Grafting 2-aminoanthraquinone on Kynol fibers was successfully achieved by reduction...
Diazonium chemistry was used to enrich Kynol carbon cloth with catechol (dihydroxybenzene) moieties as redox agents. Comprehensive surface analyses (combining BET, SEM, TGA, and TGA-GC/MS) were carried out evaluate the effect of molecules grafted over surface. Electrochemical deprotection 3,4-dimethoxyaniline electrochemically active catechol, followed by electrochemical assessment in a three-electrode cell, shows faradaic contribution due reactions from catechol-grafted moieties....
This article describes the design and tests of aqueous hybrid energy‐storage devices based on activated carbon‐negative electrode LiMn 2 O 4 (spinel) positive electrode. For this study, carbons from two different sources are selected further improved by grafting with electroactive anthraquinone molecules. The electrolyte solution is 1 m Li SO pH = 7.5. performances balanced characterized cyclic voltammetry galvanostatic measurements. It possible to charge cells up 1.5 V cycle them current...
The specific capacity of activated carbon electrodes for supercapacitors may be enhanced with additional faradaic redox reactions by grafting electroactive aromatic molecules heteroatoms that act as centers. Such enrichment was demonstrated recently anthraquinone and catechol using diazonium chemistry. Here, trihydroxybenzene, which has obvious advantages, successfully grafted, yielding a mass 25%. Electrochemical characterization in acidic aqueous solution after situ methoxy deprotection an...