Electrocatalytic Polysulfide Traps for Controlling Redox Shuttle Process of Li–S Batteries

Salem, Hesham Al; Babu, Ganguli; Rao, Chitturi Venkateswara; Arava, Leela Mohana Reddy

doi:10.1021/jacs.5b04472

Cited by 684 publications

(477 citation statements)

References 32 publications

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“…The distinguishable positive shift in the reduction peaks and negative shift in the oxidation peaks of the VN/G cathode indicate the improved polysulfide redox kinetics by VN. According to recent reports, Pt as an electrocatalyst can help to convert polysulfide deposits back to soluble long-chain polysulfide and hence enhance reaction kinetics and retain high Coulombic efficiency, and the catalytic activities of VN resemble those of noble metal Pt3435. These results suggest that VN has similar catalytic activity to that of precious metals, which can improve the redox reaction kinetics.…”

Section: Resultsmentioning

confidence: 75%

Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries

et al. 2017

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Although the rechargeable lithium–sulfur battery is an advanced energy storage system, its practical implementation has been impeded by many issues, in particular the shuttle effect causing rapid capacity fade and low Coulombic efficiency. Herein, we report a conductive porous vanadium nitride nanoribbon/graphene composite accommodating the catholyte as the cathode of a lithium–sulfur battery. The vanadium nitride/graphene composite provides strong anchoring for polysulfides and fast polysulfide conversion. The anchoring effect of vanadium nitride is confirmed by experimental and theoretical results. Owing to the high conductivity of vanadium nitride, the composite cathode exhibits lower polarization and faster redox reaction kinetics than a reduced graphene oxide cathode, showing good rate and cycling performances. The initial capacity reaches 1,471 mAh g−1 and the capacity after 100 cycles is 1,252 mAh g−1 at 0.2 C, a loss of only 15%, offering a potential for use in high energy lithium–sulfur batteries.

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Section: Resultsmentioning

confidence: 75%

Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries

et al. 2017

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“…The synthesis of silver nanoparticles was indicated by the color change in the solution, from colorless to yellowish brown [15].…”

Section: Biosynthesis Of Silver Nanoparticlesmentioning

confidence: 99%

Enhancement of Antimicrobial Sensitivity of Salmonella and Escherichia coli Strains Isolated from Chickens Using Silver Nanoparticles in Assiut Governorate

Mohamed

Mohammed²,

El‐Said³

2017

Zagazig Veterinary Journal

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Before the era of complete resistance to antibiotics due to their extensive use in poultry farms, new strategies were discovered, one of them was the use of nanoparticles to enhance the action of antibiotics. Therefore, this study was carried out to find out the antibacterial effect of silver nanoparticles (AgNPs) either separately or in combination with antibiotics. The obtained data showed the antibacterial activity of AgNPs against the tested Escherichia coli and Salmonella strains with MIC level of 0.85 µg/mL. Synergistic effects of AgNPs with antibiotics against E. coli revealed two-fold drop in MIC of ciprofloxacin and amoxicillin. Meanwhile, there was three-fold drop in MIC of gentamicin, cefotaxime and neomycin. Significant finding was observed in the case of the synergism of AgNPs with amoxicillin and gentamicin, the examined E. coli O2 resistant to amoxicillin and gentamicin became sensitive when the antibiotics were combined with AgNPs. It could be concluded that AgNPs can be easily produced by Rosemary aqueous extracts as low-cost, eco-friendly method for generating AgNPs. New generations of bactericidal compounds containing AgNPs could be successfully used in poultry farms for prevention and treating E. coli infections.

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“…Li-S gravimetric capacity is quickly diminished to less than half of the initial capacity by the 10 th cycle, 5 which has resulted in a variety of strategies to address the technical challenges arising from the insulating nature of elemental sulfur, 6 2 the volume changes upon cycling, 7 and the polysulfide shuttle involving diffusion of Li n S x through the bulk electrolyte. [8][9][10][11][12][13] We have studied the use of amorphous transition metal polysulfides (chalcogels) as the active material in an electrode to overcome the poor kinetics of lithium diffusion and to prevent polysulfide shuttling experienced in Li-S batteries. Transition metal nitrides, oxides, fluorides, phosphides, and sulfides have been investigated as alternatives to S electrodes.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum Polysulfide Chalcogels as High-Capacity, Anion-Redox-Driven Electrode Materials for Li-Ion Batteries

Subrahmanyam²,

et al. 2016

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Sulfur cathodes in conversion reaction batteries offer high gravimetric capacity but suffer from parasitic polysulfide shuttling. We demonstrate here that transition metal chalcogels of approximate formula MoS 3.4 achieve high gravimetric capacity close to 600 mAh g −1 (close to 1000 mAh g −1 on a sulfur-basis), as electrode materials for lithium-ion batteries. Transition metal chalcogels are amorphous, and comprise polysulfide chains connected by inorganic linkers. The linkers appear to act as a "glue" in the electrode to prevent polysulfide shuttling. The Mo chalcogels function as electrodes in carbonate-as well as ether-based electrolytes, which further provides evidence for polysulfide solubility not being a limiting issue. We employ X-ray spectroscopy and operando pair distribution function techniques to elucidate the structural evolution of the electrode. Raman and X-ray photoelectron spectroscopy track the chemical moieties that arise during the anion-redox-driven processes. We find the redox state of Mo remains unchanged across the electrochemical cycling and correspondingly, the redox

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Electrocatalytic Polysulfide Traps for Controlling Redox Shuttle Process of Li–S Batteries

Cited by 684 publications

References 32 publications

Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries

Conductive porous vanadium nitride/graphene composite as chemical anchor of polysulfides for lithium-sulfur batteries

Enhancement of Antimicrobial Sensitivity of Salmonella and Escherichia coli Strains Isolated from Chickens Using Silver Nanoparticles in Assiut Governorate

Molybdenum Polysulfide Chalcogels as High-Capacity, Anion-Redox-Driven Electrode Materials for Li-Ion Batteries

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