A5056110743- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Nanoporous metals and alloys
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Anodic Oxide Films and Nanostructures
- Nanoparticles: synthesis and applications
- Advanced Battery Technologies Research
- Pickering emulsions and particle stabilization
- Metallic Glasses and Amorphous Alloys
- Extraction and Separation Processes
- Ammonia Synthesis and Nitrogen Reduction
- Laser-Ablation Synthesis of Nanoparticles
- Hydrogen Storage and Materials
- Aerogels and thermal insulation
- Field-Flow Fractionation Techniques
- Nanocluster Synthesis and Applications
- Coagulation and Flocculation Studies
- Heat and Mass Transfer in Porous Media
- Nanomaterials for catalytic reactions
- Magnetic Properties of Alloys
- Magnesium Oxide Properties and Applications
- Lanthanide and Transition Metal Complexes
- nanoparticles nucleation surface interactions
Sofia University "St. Kliment Ohridski"
2015-2024
Agrobioinstitute
2015
Sodium-deficient nickel-manganese oxides exhibit a layered structure, which is flexible enough to acquire different layer stacking. The effect of stacking on the intercalation properties P3-Nax Ni0.5 Mn0.5 O2 (x=0.50, 0.67) and P2-Na2/3 Ni1/3 Mn2/3 , for use as cathodes in sodium- lithium-ion batteries, examined. For P3-Na0.67 large trigonal superstructure with 2√3 a×2√3 a×2 c observed, whereas there reduced lattice parameters. In sodium cells, P3 P2 phases intercalate reversibly at...
The study demonstrates unusual capabilities of phospho-olivine NaMnPO<sub>4</sub> to intercalate lithium and sodium reversibly, which makes it attractive electrode material instead the conventional analogue LiMnPO<sub>4</sub>.
The development of lithium and sodium ion batteries without using metal as anodes gives the impetus for elaboration low-cost environmentally friendly energy storage devices. In this contribution we demonstrate design construction a new type hybrid sodium-lithium cell by unique electrode combination (Li4Ti5O12 spinel negative layered Na3/4Co1/3Ni1/3Mn1/3O2 positive electrode) conventional electrolyte (LiPF6 salt dissolved in EC/DMC). operates at an average potential 2.35 V delivering...
Sodium-deficient nickel–manganese oxides with a layered type of structure are, nowadays, great interest as electrode materials for both lithium- and sodium-ion batteries since they are able to intercalate lithium sodium ions reversibly within broad concentration range. Herein, we report new data on the effects particle sizes electrolyte salt intercalation properties Na2/3Ni0.5Mn0.5O2 P3-type structure. The morphology has been varied by changing precursor used: from Na–Ni–Mn acetates mixed...
This review presents existing results on the formation of porous metal structures by selective dissolution metallic glasses. The compositions initial amorphous alloys, conditions chemical and electrochemical dissolution, morphology microstructure resulting structures, their main applications are included discussed. examined have allowed to make some generalizations concerning influence precursor alloy composition, type concentration electrolytes, temperature, time phase shape size pores...
Gold nanoparticles (AuNPs) exhibit strong X-ray absorption, making them promising candidates for enhancing medical diagnostics and imaging. However, understanding their behaviour under ionizing radiation is crucial safe effective clinical translation. This study examines the impact of varying irradiation doses on morphology physicochemical properties AuNPs. AuNPs synthesized via classical Turkevich method were characterized using UV-Vis spectroscopy, atomic force microscopy (AFM)...
Hydriding/dehydriding properties of a series LaNi5 based alloys were compared by applying both hydrogen gas phase and electrochemical charge/discharge methods. The highest absorption capacity 1.4 wt.% H2 was found for LaNi4.3Co0.4Al0.3, although LaNi4.8Sn0.2 also reveals comparable (>1.3%). A significant difference in the hydriding kinetics observed all studied before after activation. activated (5 cycles at 65 °C, 40 atm. H2) reach their maximum capacities less than minute, whereas pure...
Preparation of particle-loaded foams, followed by drying, sintering and/or cross-linking are widely explored routes for developing lightweight ceramics with high mechanical strength. The non-sintered dry ceramic foams less studied due to their intricate production and the assumed poor strength obtained "green" materials. Here we produce from foamed particle suspensions containing spherical silica particles radii varied between 4.5 nm 7 µm. wet prepared in presence cationic surfactant were...
Silver nanoparticles have been the subjects of research interest because their unique properties and extensive use in modern-day applications. A variety preparation techniques reported for synthesis but among them mostly recognized is a modified version Turkevich citrate method. In this study, we also chose method silver nanoparticle synthesis. The synthesized were characterized first, traditionally with UV-Visible spectroscopy then sizes shapes identified employing Atomic Force Microscopy...
A new strategy for the fabrication of binder- and carbon-free electrodes lithium ion batteries is demonstrated. The based on employment a nanoporous metallic structure as mechanically stable conductive scaffold inside which an active material directly grown. porous structures with pore size nanometric scale were obtained by de-alloying microcrystalline Cu60Ag30Al10, applying method selective dissolution less noble metals from alloy. choice LiMnPO4-olivine, displays higher energy density in...
A new binder- and carbon-free electrode for lithium-ion batteries was prepared using a hierarchically porous Ag-based current collector. The latter produced by applying the method of selective dissolution less noble metals from Cu60Ag30Al10 master alloy tape. collector reaction-coated with an electrochemically active Ag2S-CuxS coating. metallic structure provided mechanically stable conductive scaffold on walls which skin material directly deposited. ordered porosity - hierarchical...
In the course of our studies on synthesis porous metals by de-alloying amorphous precursors present work was devoted to influence alloy composition and conditions selective dissolution palladium based glasses microstructure final material. More pronounced three-dimensional ligament structure found at chemically de-alloyed compared those treated electrochemically. Noticeable difference in size pores ligaments between electrochemically partially dissolved...