Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

2019 ◽  
Author(s):  
Kent Griffith ◽  
Clare Grey
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Block Size ◽  
Lithium Intercalation ◽  
Resonance Spectroscopy ◽  
Complex Metal Oxides ◽  
Battery Electrode ◽  
Crystallographic Shear ◽  
Battery Material ◽  
First Time

Nb18W8O69 (9Nb2O5×8WO3) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (cs) structures within the Nb2O5–WO3 series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 ´ 5 units of corner-shared MO6 octahedra between the shear planes, giving rise to 2 nm ´ 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and 7Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity. In addition to its promising rate capability, Nb18W8O69 adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.

Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

2020 ◽  
Author(s):  
Kent Griffith ◽  
Clare Grey
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Block Size ◽  
Lithium Intercalation ◽  
Resonance Spectroscopy ◽  
Complex Metal Oxides ◽  
Battery Electrode ◽  
Crystallographic Shear ◽  
Battery Material ◽  
First Time

<p>Nb<sub>18</sub>W<sub>8</sub>O<sub>69</sub> (9Nb<sub>2</sub>O<sub>5</sub>×8WO<sub>3</sub>) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (<i>cs</i>) structures within the Nb<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub> series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 x 5 units of corner-shared MO<sub>6</sub> octahedra between the shear planes, giving rise to 2 nm x 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and <sup>7</sup>Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity with Li diffusivities at 298 K predominantly between 10<sup>–10</sup> and 10<sup>–12</sup> m<sup>2</sup>·s<sup>–1</sup>. In addition to its promising rate capability, Nb<sub>18</sub>W<sub>8</sub>O<sub>69</sub> adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.</p>

scholarly journals Superionic Lithium Intercalation through 2 nm x 2 nm Columns in the Crystallographic Shear Phase Nb18W8O69

2020 ◽  
Author(s):  
Kent Griffith ◽  
Clare Grey
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Block Size ◽  
Lithium Intercalation ◽  
Resonance Spectroscopy ◽  
Complex Metal Oxides ◽  
Battery Electrode ◽  
Crystallographic Shear ◽  
Battery Material ◽  
First Time

<p>Nb<sub>18</sub>W<sub>8</sub>O<sub>69</sub> (9Nb<sub>2</sub>O<sub>5</sub>×8WO<sub>3</sub>) is the tungsten-rich end-member of the Wadsley–Roth crystallographic shear (<i>cs</i>) structures within the Nb<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub> series. It has the largest block size of any known, stable Wadsley–Roth phase, comprising 5 x 5 units of corner-shared MO<sub>6</sub> octahedra between the shear planes, giving rise to 2 nm x 2 nm blocks. Rapid lithium intercalation is observed in this new candidate battery material and <sup>7</sup>Li pulsed field gradient nuclear magnetic resonance spectroscopy – measured in a battery electrode for the first time at room temperature – reveals superionic lithium conductivity with Li diffusivities at 298 K predominantly between 10<sup>–10</sup> and 10<sup>–12</sup> m<sup>2</sup>·s<sup>–1</sup>. In addition to its promising rate capability, Nb<sub>18</sub>W<sub>8</sub>O<sub>69</sub> adds a piece to the larger picture of our understanding of high-performance Wadsley–Roth complex metal oxides.</p>

A novel calendula-like MnNb2O6 anchored on graphene sheet as high-performance intercalation pseudocapacitive anode for lithium-ion capacitors

2019 ◽  
Vol 7 (6) ◽  
pp. 2855-2863 ◽  
Author(s):  
Xu Zhang ◽  
Jinyu Zhang ◽  
Shuying Kong ◽  
Kai Zhu ◽  
Jun Yan ◽  
...  
Keyword(s):  
Graphene Sheet ◽  
Anode Material ◽  
High Performance ◽  
Storage Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Charge Storage ◽  
First Time ◽  
Superior Cycling Stability

In this paper, for the first time, we investigated MnNb2O6 as a new rate capability type anode material for lithium-ion capacitors (LICs), which exhibit excellent charge storage capacity and reasonably superior cycling stability.

scholarly journals Glucose-Assisted One-Pot Hydrothermal Synthesis of Hierarchical-Structured MoS2/C Quasi-Hollow Microspheres for High-Performance Lithium Ion Battery

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 837
Author(s):  
Xingang Liu ◽  
Jiang Tan ◽  
Xi Li ◽  
Chuhong Zhang
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Hydrothermal Process ◽  
Rate Capability ◽  
Lithium Ion ◽  
Nucleating Agent ◽  
Hollow Microspheres ◽  
One Pot ◽  
Bulk Mos2 ◽  
First Time

In this work, hierarchical MoS2/C quasi-hollow microspheres are prepared by a one-pot hydrothermal process with the addition of glucose. The glucose is not only inclined to form the roundish sphere in the completion of the synthesis of MoS2, but at the same time the microspheres formed by the glucose can act as the nuclei on which the MoS2 grows. Glucose, acting as a nucleating agent, has the advantages of being low-cost and environmentally friendly, which can simplify the fabrication process. The interiors of the MoS2/C samples are multi-hole and quasi-hollow, which is beneficial for the insertion and extraction of lithium ions. For the first time, we demonstrate that hierarchical-structured MoS2/C quasi-hollow microspheres exhibit an excellent cycling stability and rate capability in lithium ion batteries (LIBs) and are significantly superior to the bulk MoS2. The method presented in this article may provide a simple, clean. and economical strategy for the preparation of MoS2/C microspheres as a feasible and promising anode material for LIBs.

A heterobimetallic single-source precursor enabled layered oxide cathode for sodium-ion batteries

2018 ◽  
Vol 54 (76) ◽  
pp. 10714-10717 ◽  
Author(s):  
Maofan Li ◽  
Kai Yang ◽  
Jiajie Liu ◽  
Xiaobing Hu ◽  
Defei Kong ◽  
...  
Keyword(s):  
High Performance ◽  
Rate Capability ◽  
Chain Structure ◽  
Sodium Ion ◽  
Single Source ◽  
Layered Oxide ◽  
Oxide Cathode ◽  
Single Source Precursor ◽  
1D Chain ◽  
First Time

A heterobimetallic single-source precursor, NaCo(acac)3, featuring a 1D chain structure was for the first time designed to achieve layered oxide P2-NaxCoO2 with superior rate capability for Na-ion batteries (SIBs). It opens a new avenue to synthesize high-performance layered oxide cathode materials for SIBs.

Facile synthesis of a metal–organic framework-derived Mn2O3 nanowire coated three-dimensional graphene network for high-performance free-standing supercapacitor electrodes

2016 ◽  
Vol 4 (21) ◽  
pp. 8283-8290 ◽  
Author(s):  
Dong Ji ◽  
Hu Zhou ◽  
Jian Zhang ◽  
Yuanyuan Dan ◽  
Hongxun Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Organic Framework ◽  
Three Dimensional ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Free Standing ◽  
Metal Organic ◽  
Oxide Composites ◽  
First Time ◽  
Good Rate Capability

3DGN and MOF-derived metal oxide composites as free-standing electrodes for supercapacitors have been reported for the first time which exhibit a high specific capacitance, good rate capability and excellent long cycle stability.

Degradation of Ciprofloxacin by Basidiomycetes and Identification of Metabolites Generated by the Brown Rot FungusGloeophyllum striatum

1999 ◽  
Vol 65 (4) ◽  
pp. 1556-1563 ◽  
Author(s):  
Heinz-Georg Wetzstein ◽  
Marc Stadler ◽  
Hans-Volker Tichy ◽  
Axel Dalhoff ◽  
Wolfgang Karl
Keyword(s):  
High Performance ◽  
Agricultural Soils ◽  
Brown Rot ◽  
Resonance Spectroscopy ◽  
Ionization Mass ◽  
Antibacterial Drug ◽  
Animal Dung ◽  
Serious Infections ◽  
New Type ◽  
First Time

ABSTRACT Ciprofloxacin (CIP), a fluoroquinolone antibacterial drug, is widely used in the treatment of serious infections in humans. Its degradation by basidiomycetous fungi was studied by monitoring14CO2 production from [14C]CIP in liquid cultures. Sixteen species inhabiting wood, soil, humus, or animal dung produced up to 35% 14CO2 during 8 weeks of incubation. Despite some low rates of14CO2 formation, all species tested had reduced the antibacterial activity of CIP in supernatants to between 0 and 33% after 13 weeks. Gloeophyllum striatum was used to identify the metabolites formed from CIP. After 8 weeks, mycelia had produced 17 and 10% 14CO2 from C-4 and the piperazinyl moiety, respectively, although more than half of CIP (applied at 10 ppm) had been transformed into metabolites already after 90 h. The structures of 11 metabolites were elucidated by high-performance liquid chromatography combined with electrospray ionization mass spectrometry and 1H nuclear magnetic resonance spectroscopy. They fell into four categories as follows: (i) monohydroxylated congeners, (ii) dihydroxylated congeners, (iii) an isatin-type compound, proving elimination of C-2, and (iv) metabolites indicating both elimination and degradation of the piperazinyl moiety. A metabolic scheme previously described for enrofloxacin degradation could be confirmed and extended. A new type of metabolite, 6-defluoro-6-hydroxy-deethylene-CIP, provided confirmatory evidence for the proposed network of congeners. This may result from sequential hydroxylation of CIP and its congeners by hydroxyl radicals. Our findings reveal for the first time the widespread potential for CIP degradation among basidiomycetes inhabiting various environments, including agricultural soils and animal dung.

scholarly journals Flower-Like Nanostructured ZnCo2O4/RuO2 Electrode Materials for High Performance Asymmetric Supercapacitors

2021 ◽  
Author(s):  
jinjin wang ◽  
Tianfeng Ye ◽  
Yanqun Shao ◽  
zhiyuan lu ◽  
yuting lin ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Electrode Materials ◽  
Rate Capability ◽  
High Rate ◽  
Density Of State ◽  
Asymmetric Supercapacitors ◽  
Redox Active ◽  
First Time

Abstract RuO2 is well known to be an active and expensive metal oxide. In the paper, ZnCo2O4/RuO2 nanocomposites had been synthesized by simple hydrothermal, impregnation and calcination methods. Due to the multifunctional bridge structure, RuO2 could not only effectively inhibit the volume change of ZnCo2O4 in long-term work but also provide more redox active sites. The forbidden bandwidth was reduced and the conductivity was improved after doping RuO2. Comparing with ZnCo2O4, the density of state of ZnCo2O4/RuO2 tended to a higher energy level. ZnCo2O4/3wt% RuO2 electrode exhibited the excellent specific capacitance (1346.56 F g−1), high rate capability and cyclic stability in 6 M KOH aqueous solution. For the first time, the electrochemical performance of ZnCo2O4/RuO2//IrO2-ZnO ASC has been evaluated in two-electrode configurations. The supercapacitor exhibited an excellent energy density of 40.89 W h kg-1 at the power density of 740 W kg-1 and a high capacitance retention of 87.5 % even after 7000 cycles at a scanning rate of 100 mV s-1. The ZnCo2O4/RuO2 was a promising electrode material for supercapacitors.

High performance electrochemical capacitors based on MnO2/activated-carbon-paper

2015 ◽  
Vol 3 (24) ◽  
pp. 6166-6171 ◽  
Author(s):  
Zhiyu Cheng ◽  
Guiping Tan ◽  
Yongfu Qiu ◽  
Bing Guo ◽  
Faliang Cheng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
High Performance ◽  
Electrochemical Capacitors ◽  
Rate Capability ◽  
Electrochemical Capacitor ◽  
High Specific Capacitance ◽  
Carbon Paper ◽  
First Time

The composite MnO2/activated-carbon-paper has been reported for the first time and it shows high specific capacitance and remarkable rate capability as an electrochemical capacitor.

Development of an HPLC-UV Method for Quantification of Stattic

2019 ◽  
Vol 15 (6) ◽  
pp. 568-573
Author(s):  
Soheil Sedaghat ◽  
Ommoleila Molavi ◽  
Akram Faridi ◽  
Ali Shayanfar ◽  
Mohammad Reza Rashidi
Keyword(s):  
High Performance ◽  
Accurate Method ◽  
Plasma Samples ◽  
Promising Target ◽  
Relative Standard ◽  
Dimerization Inhibitor ◽  
Oncogenic Protein ◽  
First Time ◽  
Transcription 3

Background: Signal transducer and activator of transcription 3 (STAT3), an oncogenic protein found constitutively active in many types of human malignancies, is considered to be a promising target for cancer therapy. Objective: In this study for the first time, a simple and accurate method has been developed for the determination of a STAT3 dimerization inhibitor called stattic in aqueous and plasma samples. Methods: A reverse-phase high-performance liquid chromatography (RP-HPLC) composed of C18 column as stationary phase, and the mixture of acetonitrile (60%) and water (40%) as mobile phase with a UV detection at 215 nm were applied for quantification of stattic. The developed method was validated by Food and Drug Administration (FDA) guideline. Results: The method provided a linear range between 1-40 and 2.5-40 µg mL-1 for aqueous and plasma samples, respectively, with a correlation coefficient of 0.999. The accuracy (as recovery) of the developed method was found to be between 95-105% for aqueous medium and 85-115% for plasma samples. The precision (as relative standard deviation) for aqueous and plasma samples was less than 6% and 15%, respectively. The sensitivity of the developed method based on FDA guideline was 1 µg mL-1 for aqueous and 2.5 µg mL-1 for plasma samples. Conclusion: These results show that the established method is a fast and accurate quantification for stattic in aqueous and plasma samples.

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