The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The ordered porous materials, developed using various templating materials, have generated huge interest among the electrochemist community due to their plenty of unique properties and functionalities that can be effectively applied in optoelectronic devices. Mesoporous materials possess excellent opportunities in energy storage and energy conversion applications due to their extraordinarily high...
Doped ceria-carbonate electrolytes have high ionic conductivity and shows good solid oxide fuel cell (SOFC) performance at low temperature (400–600 °C). Various compositions of unary, binary, and ternary gadolinium-doped ceria-carbonate electrolytes are prepared using (Na, Li, K, Sr)-CO3 and GDC. The electrolytes are physically and electrochemically characterized using X-ray diffraction, scanning...
As a key component of alkali anion exchange membrane fuel cells, the anion exchange membrane (AEM) needs to have high ionic conductivity and good stability. Herein, highly branched side chain grafted polysulfone AEMs are designed and fabricated via macromolecule-initiated atom transfer radical polymerization of chloromethyl styrene. The highly branched side chain results in increased free volume in...
(Ni0.8Mn0.1Co0.1)(OH)2 and Co(OH)2 secondly treated by LiNi0.8Mn0.1Co0.1O2 have been prepared via co-precipitation and high-temperature solid-state reaction. The residual lithium contents, XRD Rietveld refinement, XPS, TG-DSC, and electrochemical measurements are carried out. After secondly treating process, residual lithium contents decrease drastically, and occupancy of Ni in 3a site is much lower...
Li-S batteries are one of exciting new technologies in high energy density storage devices. But, their widespread commercialization has been limited by several obstacles. Elemental sulfur is not conductive electrically and electrochemical conversion during cycles causes intense change in volume. In this work, a sulfur/polyaniline/nitrogen-doped graphene aerogel (S@PANi-NGA) nanocomposite synthesized...
Modified micron-sized commercial polyacrylonitrile-based carbon fiber (PAN-CF) electrodes were prepared using an electrochemical method. Such modified electrodes exhibit remarkably improved catalytic activity together with outstanding stability for oxygen reduction reactions (ORR) in seawater batteries. The effects of three solutions, including sodium hydroxide, sulfuric acid, and sodium nitrate,...
Nanoporous carbon microspheres (NCMs) are prepared by a one-step carbonizing and activating resorcinol−formaldehyde polymer spheres (RFs) in inert and CO2 atmosphere for anode materials of lithium-ion batteries (LIBs). Compared with RFs carbon microspheres (RF-C), after activating with hot CO2, the NCMs with porous structure and high BET surface area of 2798.8 m2 g−1, which provides abundant lithium-ion...
Carbon-coated LiMnBO3/C is synthesized by a sol-gel method using polyethylene glycol 6000 (PEG-6000) as carbon source. The influences of different sintering temperatures on the crystal structure, morphology, and electrochemical performance of LiMnBO3/C composites are investigated. XRD results indicate that the samples consist of the monoclinic phase LiMnBO3 (m-LiMnBO3) and the hexagonal phase LiMnBO...
A flexible Co3O4 hollow microsphere/graphene/carbon nanotube hybrid film is successfully prepared through a facile filtration strategy and a subsequent thermally treated process. The composition, morphology, and structure of the as-prepared film are characterized by X-ray diffraction, X-ray photoelectron spectrometer, scanning electron microscopy, and transmission electron microscopy. Based on the...
Carbon-coated magnesium ferrite composite nanofibers (MFO/C) have been synthesized via a combination of electrospinning and carbonization process. The as-prepared MFO/C with uniform carbon layers were explored as anode material for lithium-ion batteries. Electrochemical results show that benefiting from its appropriate carbon coating, MFO/C-2 can deliver a reversible capacity of 743 mAh g−1 after...
Sodium-ion-conducting poly(ethylene oxide) (PEO)-based solid polymer electrolyte films mixed with salt sodium thiocyanate (NaSCN) have been prepared by solution-cast method. Films were characterized in detail using optical microscopy, differential scanning calorimetry, and impedance spectroscopy. The drop in ionic conductivity with increasing salt concentration is supported by a decrease in number...
The LiNi0.8Co0.1Mn0.1O2 with LiAlO2 coating was obtained by hydrolysis–hydrothermal method. The morphology of the composite was characterized by SEM, TEM, and EDS. The results showed that the LiAlO2 layer was almost completely covered on the surface of particle, and the thickness of coating was about 8–12 nm. The LiAlO2 coating suppressed side reaction between composite and electrolyte; thus, the...
In this work, an amorphous Ni-B alloy was synthesized by chemical reduction and used in a direct borohydride fuel cell (DBFC). Characterization of the catalyst structure, composition, and morphology was performed by XRD, EDX, TEM, and SEM. In addition, the results showed that Ni-B presents as amorphous nanoparticles. The particle diameters ranged from 22 to 25 nm. The cyclic voltammetry (CV) and chronoamperometry...
Al-doped Li2MnO3 (Li2Mn0.9Al0.1O3) lithium-rich layered oxide is prepared and investigated as cathode material for lithium-ion batteries (LIBs). X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) analyses reveal that the Al element is distributed in the sample homogenously. The Al-LMO sample exhibits a great improvement on the rate capability and cycling...
Bentonites are promising materials for electrochemical sensing because of their unique physicochemical properties. They have relatively high surface area, good adsorption and ion-exchange ability, highly tunable surface and interlayer composition, non-toxic nature, and excellent biocompatibility. Moreover, they are outstanding substrates for stable immobilization of different functional moieties....
The polypyrrole (PPy) nanowires are conducting 1D materials, which can significantly improve the electrical conductivity of the composites. A novel Li1.26Fe0.22Mn0.52O2 (LFMO) @ PPy nanowire composites were synthesized by simply ultrasonic dispersing LFMO and PPy nanowires in aqueous ethanol. The structure and morphology of pristine LFMO and LFMO@PPy are investigated by XRD, SEM, and TEM. The elemental...
Electrochemical potential determines types of redox products formed on electrically conducting minerals like galena, which might manipulate process efficiency applied on the target mineral. Therefore, electrochemical behavior of galena has utmost importance for flotation and hydrometallurgical applications. This study was performed to elucidate redox behavior of galena by cyclic voltammetry (CV) technique...
The Na superionic conductor (NASICON) NaNbAlP3O12 compound was prepared by the conventional solid-state reaction method. The formation of single-phase material was confirmed by X-ray diffraction studies, and it was found to be a hexagonal phase at room temperature. The electrical conductivity was measured in the frequency range from 200 Hz to 5 MHz and temperatures between 573 and 773 K using impedance...
Thickness changes associated with charging and discharging challenge the practical application of electrodes composed of high-capacity materials towards batteries of both high energy density and long life. The investigation on the electrode level has found that the red phosphorus composite electrodes experience reversible expansion and shrinkage during lithiation/delithiation, except for the first...
To settle the drawbacks of non-cost-effective and enhance the electrocatalytic performance of Pt/C, Fe@Pt core-shell nanoparticles supported by Vulcan XC-72 have been designed and synthetized successfully. The synthesized materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, whereas the electrochemical...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.