Manipulating Ion Concentration to Boost Two‐Electron Mn 4+ /Mn 2+ Redox Kinetics through a Colloid Electrolyte for High‐Capacity Zinc Batteries

2021 ◽  
pp. 2102393
Author(s):  
Xuesong Xie ◽  
Hongwei Fu ◽  
Yun Fang ◽  
Bingan Lu ◽  
Jiang Zhou ◽  
...  
Keyword(s):  
High Capacity ◽  
Ion Concentration ◽  
Redox Kinetics

Electrocatalytically Active Niobium Sulfide Modified Carbon Cloth for Lithium–Sulfur Batteries

2017 ◽  
Vol 15 (1) ◽  
Author(s):  
Leela Mohana Reddy Arava ◽  
Deepesh Gopalakrishnan ◽  
Andrew Lee
Keyword(s):  
High Capacity ◽  
High Conductivity ◽  
Capacity Fade ◽  
Carbon Cloth ◽  
Redox Kinetics ◽  
Lithium Sulfur Batteries ◽  
The Many ◽  
Niobium Sulfide ◽  
Microscopic Techniques ◽  
Lithium Sulfur

We report a simple novel annealing technique for the synthesis of NbS2 nanoflakes. The synthesized NbS2 flakes were characterized well with different spectroscopic and microscopic techniques and confirmed they are in 3R-NbS2 polymorph structure, which is semiconducting in nature. Later, they were successfully deposited onto carbon cloth (CC) and tested for Li–S cell. Lithium–sulfur batteries suffer from polysulfide (PS) shuttling effects which hinder the performance of the cell. High capacity fade, slow redox kinetics, and the low cyclability of cells are just some of the many problems caused by the shuttling effect that hinder the viability of the battery. Herein, we utilized the catalytic nature of NbS2 along with the high conductivity of CC for better PS adsorption, their liquid to solid conversion, fast PS redox kinetics which substantially enhanced the overall Li–S performance.

High-performance aqueous sodium-ion/sulfur battery using elemental sulfur

2021 ◽  
Author(s):  
Mukesh Kumar ◽  
Neha Thakur ◽  
Ankur Bordoloi ◽  
Ashok Yadav ◽  
Shambhunath Jha ◽  
...  
Keyword(s):  
High Performance ◽  
Large Scale ◽  
Elemental Sulfur ◽  
Electrode Materials ◽  
Chemical Interaction ◽  
High Capacity ◽  
Electrochemical Analysis ◽  
Sodium Ion ◽  
Redox Kinetics ◽  
Kinetics Of

Abstract Despite a promising outlook, the large-scale application of aqueous rechargeable sodium-ion batteries (ARSIBs) was impeded due to low-capacity electrode materials. Herein we report a high capacity elemental sulfur-based anode (S@NiVP/Pi-NCS) for aqueous rechargeable sodium ion-sulfur batteries using 70 % of elemental sulfur which deliver an outstanding capacity of 826 mA h/g at 0.5 C with an excellent cycling stability even at 10 C and a negligible capacity decay with 0.03 % sulfur loss per cycle even after 400 cycles. In-situ spectro-electrochemical analysis confirms good anchoring ability of the anode and a faster redox kinetics of polysulfide conversion. The chemical interaction with vanadium provides faster redox kinetics of polysulfide conversion and efficient anchoring as revealed by XPS and was further supported by XANES and EXAFS studies wherein the distortion at the V site and overlapping electronic states in NiVP/Pi catalyst was observed. Further, full cell battery using S@NiVP/Pi-NCS anode and Na0.44MnO2 cathode demonstrates an excellent initial capacity of 705 mA h/g based on S loading and 91.7 mAh/g w.r.t. total electrode weight at 0.5 C with 91 % of capacity retention after 400 cycles and two full cells connected in series able to power LED demonstrate its practical application.

scholarly journals Central composite design optimization of copper (ii) ions removal in aqueous solution using azadirachta indica (neem) leaf powder

2021 ◽  
Vol 12 (2) ◽  
pp. 49-56
Author(s):  
M.S. Sulaiman
Keyword(s):  
Aqueous Solution ◽  
Central Composite Design ◽  
Azadirachta Indica ◽  
Metal Ion ◽  
High Capacity ◽  
Freundlich Isotherm ◽  
Batch Process ◽  
Ion Concentration ◽  
Neem Leaves ◽  
Central Composite

Biosorption is considered as a potential method for the removal of heavy toxic metals from waste solution and as alternative to other conventional process such as precipitation, ion exchange, electrochemical treatment and evaporative recovery, especially, when the concentration of the heavy metal ion is low. In the present study, (Azadirachta indica) neem leaves Powder (NLP), was investigated for the removal of Cu(II) ions from aqueous solution based on modelling and optimization. Central composite design was successfully applied to develop a response surface to optimize medium conditions. Characterisations of the NLP was conducted, and the effects of contact time (0-180 minutes), Cu(II) ion concentration (10(298-318 K) and dosage (0.52.5 g/L) were studied in batch process. The optimal adsorption of copper obtained was found to be 308 K, 97.5min and 1.5g respectively resulting in 100% of adsorption of copper The analysis with FTIR indicated thyat possible hydroxyl and carboxyl functional groups are involved in metal CU(II) ions biosorption. Adsorption isotherms were modelled by the Langmuir and Freundlich isotherm equations, with the former providing a better fit for the data. Results obtained from this study indicate that NLP is a very promising candidate for the low-cost and high-capacity removal of Cu(II) ions from aqueous solution. 

Ratio imaging of intracellular ion concentration

1992 ◽  
Vol 50 (2) ◽  
pp. 1160-1161
Author(s):  
Stephen R. Bolsover
Keyword(s):  
Individual Cell ◽  
Video Camera ◽  
Field Of View ◽  
Ion Concentration ◽  
Fluorescence Signal ◽  
Ion Imaging ◽  
Ratiometric Fluorescence ◽  
Ratio Imaging ◽  
The Mean ◽  
The Many

The field of intracellular ion concentration measurement expanded greatly in the 1980's due primarily to the development by Roger Tsien of ratiometric fluorescence dyes. These dyes have many applications, and in particular they make possible to image ion concentrations: to produce maps of the ion concentration within living cells. Ion imagers comprise a fluorescence microscope, an imaging light detector such as a video camera, and a computer system to process the fluorescence signal and display the map of ion concentration.Ion imaging can be used for two distinct purposes. In the first, the imager looks at a field of cells, measuring the mean ion concentration in each cell of the many in the field of view. One can then, for instance, challenge the cells with an agonist and examine the response of each individual cell. Ion imagers are not necessary for this sort of experiment: one can instead use a system that measures the mean ion concentration in a just one cell at any one time. However, they are very much more convenient.

Confocal imaging of calcium in intact ventricular muscle provides a new view of excitation-contraction coupling

1996 ◽  
Vol 54 ◽  
pp. 738-739
Author(s):  
W.G. Wier
Keyword(s):  
Local Control ◽  
Cardiac Tissue ◽  
Cell Function ◽  
Isolated Heart ◽  
Cardiac Cells ◽  
Confocal Imaging ◽  
Ion Concentration ◽  
Heart Cell ◽  
Free Calcium ◽  
Heart Cells

A fundamentally new understanding of cardiac excitation-contraction (E-C) coupling is being developed from recent experimental work using confocal microscopy of single isolated heart cells. In particular, the transient change in intracellular free calcium ion concentration ([Ca2+]i transient) that activates muscle contraction is now viewed as resulting from the spatial and temporal summation of small (∼ 8 μm3), subcellular, stereotyped ‘local [Ca2+]i-transients' or, as they have been called, ‘calcium sparks'. This new understanding may be called ‘local control of E-C coupling'. The relevance to normal heart cell function of ‘local control, theory and the recent confocal data on spontaneous Ca2+ ‘sparks', and on electrically evoked local [Ca2+]i-transients has been unknown however, because the previous studies were all conducted on slack, internally perfused, single, enzymatically dissociated cardiac cells, at room temperature, usually with Cs+ replacing K+, and often in the presence of Ca2-channel blockers. The present work was undertaken to establish whether or not the concepts derived from these studies are in fact relevant to normal cardiac tissue under physiological conditions, by attempting to record local [Ca2+]i-transients, sparks (and Ca2+ waves) in intact, multi-cellular cardiac tissue.

CuS2 sheets: a hidden anode material with a high capacity for sodium-ion batteries

2021 ◽  
Author(s):  
Shaohua Lu ◽  
Weidong Hu ◽  
Xiaojun Hu
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Low Cost ◽  
High Capacity ◽  
Lithium Ion ◽  
Sodium Ion ◽  
Sodium Ion Batteries

Due to their low cost and improved safety compared to lithium-ion batteries, sodium-ion batteries have attracted worldwide attention in recent decades.

Receptor Mediated Binding of the Fibrinolytic Components, Plasminogen and Urokinase, to Peripheral Blood Cells

1987 ◽  
Vol 58 (03) ◽  
pp. 936-942 ◽  
Author(s):  
Lindsey A Miles ◽  
Edward F Plow
Keyword(s):  
T Cells ◽  
B Cell ◽  
Peripheral Blood ◽  
Binding Sites ◽  
Blood Cells ◽  
High Capacity ◽  
Red Cells ◽  
Peripheral Blood Cells ◽  
Cellular Functions ◽  
Fibrinolytic Proteins

SummaryGlu-plasminogen binds to platelets; the monocytoid line, U937, and the human fetal fibroblast line, GM1380 bind both plasminogen and its activator, urokinase. This study assesses the interaction of these fibrinolytic proteins with circulating human blood cells. Plasminogen bound minimally to red cells but bound saturably and reversibly to monocytes, granulocytes and lymphocytes with apparent Kd values of 0.9-1.4 μM. The interactions were of high capacity with 1.6 to 49 × 105 sites/cell and involved the lysine binding sites of plasminogen. Both T cells and non-rosetting lymphocytes and two B cell lines saturably bound plasminogen. Urokinase bound saturably to gianulocytes, monocytes, non-rosetting lymphocytes and a B cell line, but minimally to T cells, platelets and red cells. Therefore, plasminogen binding sites of high capacity, of similar affinities, and with common recognition specificities are expressed by many peripheral blood cells. Urokinase receptors are also widely distributed, but less so than plasminogen binding sites. The binding ol plasminogen and/ or urokinase to these cells may lead to generation of cell- associated proteolytic activity which contributes to a variety of cellular functions.

Abnormal Platelet Serotonin Uptake and Binding Sites in Myeloproliferative Disorders

1984 ◽  
Vol 51 (03) ◽  
pp. 349-353 ◽  
Author(s):  
C Caranobe ◽  
P Sié ◽  
F Fernandez ◽  
J Pris ◽  
S Moatti ◽  
...  
Keyword(s):  
Binding Sites ◽  
High Capacity ◽  
Specific Inhibitor ◽  
Myeloproliferative Disorders ◽  
Normal Subjects ◽  
Binding Data ◽  
Full Explanation ◽  
Number Of Binding Sites ◽  
5 Ht Uptake ◽  
Kinetics Of

SummaryA simultaneous investigation of the kinetics of serotonin (5 HT) uptake and of binding sites was carried out in the platelets of normal subjects and of 10 patients affected with various types of myeloproliferative disorders (MD). The 5 HT uptake was analysed according to the Lineweaver-Burk and the Eadie-Hofstee methods. With the two methods, the patient’s platelets exhibited a dramatic reduction of the Vi max and of the Km; in some patients the Eadie-Hofstee analysis revealed that a passive diffusion phenomenon is superimposed on the active 5 HT uptake at least for the higher concentration used. The binding data were analysed with the Scatchard method. Two classes of binding sites (high affinity - low capacity, low affinity - high capacity) were found in normal subjects and patients. Pharmacological studies with imipramine, a specific inhibitor of 5 HT uptake, suggested that both the sites are involved in 5 HT uptake. The number of both binding sites was significantly decreased in patient’s platelets while the affinity constants of these binding sites were not significantly reduced in comparison with those of the control subjects. No correlations were found between Vi max, Km and the number of binding sites. These results suggest that a reduction in the number of platelet membrane acceptors for 5 HT commonly occurs in myeloproliferative disorders but does not provide a full explanation of the uptake defect.

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