Exploring the high-voltage Mg2+/Na+ co-intercalation reaction of Na3VCr(PO4)3 in Mg-ion batteries

2019 ◽  
Vol 7 (30) ◽  
pp. 18081-18091 ◽  
Author(s):  
Saúl Rubio ◽  
Rui Liu ◽  
Xiangsi Liu ◽  
Pedro Lavela ◽  
José L. Tirado ◽  
...  
Keyword(s):  
High Voltage ◽  
Intercalation Reaction ◽  
Redox Couples

A Na3VCr(PO4)3 cathode facilitates a high voltage Mg2+/Na+ co-intercalation reaction entailing V3+/V4+ and V4+/V5+ redox couples at 1.7–2.3 V vs. Mg2+/Mg.

Development of Transparent and High-Voltage Electrolyte Using Binary Redox Couples for Dye-Sensitized Solar Cells

2020 ◽  
Vol MA2020-02 (27) ◽  
pp. 1888-1888
Author(s):  
Kicheon Yoo ◽  
Hyeong Cheol Kang ◽  
Narayan Chandra Deb Nath ◽  
Jung Jae Lee ◽  
Jae-Joon Lee
Keyword(s):  
Solar Cells ◽  
High Voltage ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Redox Couples ◽  
Sensitized Solar Cells

Binary Redox Couples for Highly Transparent and High-Voltage Dye-Sensitized Solar Cells

2021 ◽  
Vol 10 (2) ◽  
pp. 025007
Author(s):  
Kicheon Yoo ◽  
Narayan Chandra Deb Nath ◽  
Hyeong Cheol Kang ◽  
Senthilkumar Muthu ◽  
Jae-Joon Lee
Keyword(s):  
Solar Cells ◽  
High Voltage ◽  
Dye Sensitized Solar Cells ◽  
Dye Sensitized ◽  
Redox Couples ◽  
Sensitized Solar Cells

A High Voltage Organic Redox Flow Battery with Redox Couples O2/Tetrabutylammonium Complex and Tris(4-bromophenyl)amine as Redox Active Species

2018 ◽  
Vol 165 (11) ◽  
pp. A2696-A2702 ◽  
Author(s):  
Vasudevarao Pasala ◽  
Chinmaya Ramachandra ◽  
Sankararaman Sethuraman ◽  
Kothandaraman Ramanujam
Keyword(s):  
High Voltage ◽  
Active Species ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Redox Couples ◽  
Redox Active

scholarly journals Towards Reversible High-Voltage Multi-Electron Reactions in Alkali-Ion Batteries Using Vanadium Phosphate Positive Electrode Materials

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1428
Author(s):  
Edouard Boivin ◽  
Jean-Noël Chotard ◽  
Christian Masquelier ◽  
Laurence Croguennec
Keyword(s):  
High Voltage ◽  
Electrode Materials ◽  
Positive Electrode ◽  
Vanadium Phosphate ◽  
Voltage Range ◽  
Redox Couples ◽  
Vanadium Phosphates ◽  
Vanadium Redox ◽  
Alkali Ion ◽  
Positive Electrode Materials

Vanadium phosphate positive electrode materials attract great interest in the field of Alkali-ion (Li, Na and K-ion) batteries due to their ability to store several electrons per transition metal. These multi-electron reactions (from V2+ to V5+) combined with the high voltage of corresponding redox couples (e.g., 4.0 V vs. for V3+/V4+ in Na3V2(PO4)2F3) could allow the achievement the 1 kWh/kg milestone at the positive electrode level in Alkali-ion batteries. However, a massive divergence in the voltage reported for the V3+/V4+ and V4+/V5+ redox couples as a function of crystal structure is noticed. Moreover, vanadium phosphates that operate at high V3+/V4+ voltages are usually unable to reversibly exchange several electrons in a narrow enough voltage range. Here, through the review of redox mechanisms and structural evolutions upon electrochemical operation of selected widely studied materials, we identify the crystallographic origin of this trend: the distribution of PO4 groups around vanadium octahedra, that allows or prevents the formation of the vanadyl distortion (O…V4+=O or O…V5+=O). While the vanadyl entity massively lowers the voltage of the V3+/V4+ and V4+/V5+ couples, it considerably improves the reversibility of these redox reactions. Therefore, anionic substitutions, mainly O2− by F−, have been identified as a strategy allowing for combining the beneficial effect of the vanadyl distortion on the reversibility with the high voltage of vanadium redox couples in fluorine rich environments.

High Voltage Electron Microscopy of Ion-Milled Dental Enamel

1974 ◽  
Vol 32 ◽  
pp. 60-61
Author(s):  
L. D. Ackerman ◽  
S. H. Y. Wei
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Third Molar ◽  
Polarized Light ◽  
Dental Enamel ◽  
Longitudinal Section ◽  
Ion Milling ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron

Mature human dental enamel has presented investigators with several difficulties in ultramicrotomy of specimens for electron microscopy due to its high degree of mineralization. This study explores the possibility of combining ion-milling and high voltage electron microscopy as a means of circumventing the problems of ultramicrotomy.A longitudinal section of an extracted human third molar was ground to a thickness of about 30 um and polarized light micrographs were taken. The specimen was attached to a single hole grid and thinned by argon-ion bombardment at 15° incidence while rotating at 15 rpm. The beam current in each of two guns was 50 μA with an accelerating voltage of 4 kV. A 20 nm carbon coating was evaporated onto the specimen to prevent an electron charge from building up during electron microscopy.

Three-Dimensional Visualization of the T-System of Frog Muscle Using High Voltage Electron Microscopy and a Lanthanum Stain

1977 ◽  
Vol 35 ◽  
pp. 570-571 ◽  
Author(s):  
Lee D. Peachey ◽  
Clara Franzini-Armstrong
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Three Dimensional ◽  
Biological Tissues ◽  
High Voltage Electron Microscopy ◽  
Transverse Tubular System ◽  
Peroxidase Reaction ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
T System

The effective study of biological tissues in thick slices of embedded material by high voltage electron microscopy (HVEM) requires highly selective staining of those structures to be visualized so that they are not hidden or obscured by other structures in the image. A tilt pair of micrographs with subsequent stereoscopic viewing can be an important aid in three-dimensional visualization of these images, once an appropriate stain has been found. The peroxidase reaction has been used for this purpose in visualizing the T-system (transverse tubular system) of frog skeletal muscle by HVEM (1). We have found infiltration with lanthanum hydroxide to be particularly useful for three-dimensional visualization of certain aspects of the structure of the T- system in skeletal muscles of the frog. Specifically, lanthanum more completely fills the lumen of the tubules and is denser than the peroxidase reaction product.

Resolution, Contrast and Interpretation of HVEM Images of Crystals

1973 ◽  
Vol 31 ◽  
pp. 228-229
Author(s):  
L. E. Thomas ◽  
J. S. Lally ◽  
R. M. Fisher
Keyword(s):  
High Voltage ◽  
Chromatic Aberration ◽  
Crystalline Materials ◽  
Resolution Parameter ◽  
Instrument Resolution ◽  
Imaging Conditions ◽  
Beam Excitation ◽  
Optimum Imaging

In addition to improved penetration at high voltage, the characteristics of HVEM images of crystalline materials are changed markedly as a result of many-beam excitation effects. This leads to changes in optimum imaging conditions for dislocations, planar faults, precipitates and other features.Resolution - Because of longer focal lengths and correspondingly larger aberrations, the usual instrument resolution parameter, CS174 λ 374 changes by only a factor of 2 from 100 kV to 1 MV. Since 90% of this change occurs below 500 kV any improvement in “classical” resolution in the MVEM is insignificant. However, as is widely recognized, an improvement in resolution for “thick” specimens (i.e. more than 1000 Å) due to reduced chromatic aberration is very large.

Radiation-Induced Precipitation at Thin Foil Surfaces in Ni-Be Alloys

1982 ◽  
Vol 40 ◽  
pp. 598-599
Author(s):  
T. Mukai ◽  
T. E. Mitchell
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Electron Irradiation ◽  
High Vacuum ◽  
Thin Foil ◽  
Homogeneous Precipitation ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
Radiation Induced

Radiation-induced homogeneous precipitation in Ni-Be alloys was recently observed by high voltage electron microscopy. A coupling of interstitial flux with solute Be atoms is responsible for the precipitation. The present investigation further shows that precipitation is also induced at thin foil surfaces by electron irradiation under a high vacuum.

Sign in / Sign up

Export Citation Format

Share Document