Dielectric relaxation, complex impedance and modulus spectroscopic studies of mix phase rod like cobalt sulfide nanoparticles
TL;DR: In this paper, the authors synthesize cobalt sulfide (CoS) nano-particles using microwave assisted route and the impedance spectra were recorded in the range from 10-Hz to 10-MHz at various temperatures from 323-K to 373-K.
About: This article is published in Materials Research Bulletin.The article was published on 2017-09-01. It has received 199 citations till now. The article focuses on the topics: Cobalt sulfide & Cobalt.
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TL;DR: Graphene nanosheet-supported hollow cobalt sulfide nanocrystals (Co3S4@GN, CoS@GN) were fabricated via a facile ligand exchange route using metal-organic frameworks (MOFs) as self-templates as mentioned in this paper.
Abstract: Graphene nanosheet-supported hollow cobalt sulfide nanocrystals (Co3S4@GN, CoS@GN) were fabricated via a facile ligand exchange route using metal-organic frameworks (MOFs) as self-templates. Subsequent thermal annealing induced the phase transformation of Co3S4 to CoS. This synthesis strategy drove the cobalt ions inside zeolitic imidazolate frameworks (ZIF-67) to migrate outwards, forming a highly reactive shell composed of abundant exposed active sites to activate peroxymonosulfate (PMS) in the sulfate radical (SO4 −)-based advanced oxidation process (SR-AOP). The graphene support exhibited excellent efficiencies in the enrichment of targeted pollutant as well as the charge transfer between absorbed molecules and radicals. The nanocatalysts were fully characterized and applied to the catalytic degradation of bisphenol A (BPA). Benefitting from the unique structure characteristic, the as-synthesized nanocomposites showed superior catalytic activities over a broad pH range. The degradation efficiency of BPA reached ∼100% within 8 min by using CoS@GN, and the kinetic constant (0.62 min-1) was higher than those of most reported heterogeneous catalysts by 1–2 orders of magnitude. Furthermore, the critical roles of graphene support in regulating the variety and action site of radicals were addressed for the first time. The adsorptive and conductive graphene made the SO4 − once produced was consumed immediately, which limited the diffusion of SO4 − out of catalyst surface and the generation of OH. The catalyst served as a surface-bound SO4 − sink for the in-situ degradation of adsorbed BPA. Catalyst characterizations and the Density-Functional-Theory (DFT) calculation confirmed the excellent activity of CoS@GN in yielding SO4 − with Co(II) as the active center. A CoS@GN-coated membrane reactor was constructed to avoid catalyst loss and worked well in consecutive 3 cycles, suggesting the satisfactory catalyst reusability and system robustness. Overall, this work paved a new way for MOFs in the environmental application and provided a novel family of Co-based nanocatalysts to produce surface-bound radicals for recalcitrant contaminant degradation by SR-AOP.
166 citations
TL;DR: In this article, the authors have shown that Amino acids have properties like molecular chirality and zwitter ionic nature helps to improve NLO properties of ADP.
59 citations
TL;DR: In this article, the Pb 0.8-y La y Co 0.2 TiO 3 (y = 0.2-0.8) (PLCT) nanoparticles were prepared by sol-gel method and further subjected to microwave heating.
53 citations
TL;DR: In this article, the effect of La-substitution on structural and functional properties of lead cobalt titanate (PCT) perovskite structure as a function of variation of Co-content was reported.
52 citations
TL;DR: In this paper, structure-modified CoS-nanoboxes (CoS-NBs) scaffold as a multifunctional Supporting material has been developed by using a template-consumption method for nanoconfinement of MgH2 particles within its mesoporous structure.
49 citations
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TL;DR: In this paper, the authors used a Geiger counter spectrometer to measure the changes in intensity distribution in the spectra of cold worked aluminium and wolfram and found that the line breadths may be attributed to simultaneous small particle size and strain broadening, the latter predominating at the higher Bragg angles.
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TL;DR: A review of dielectric data for a wide range of solids proves the existence of a remarkable "universality" of frequency and time responses which is essentially incompatible with the multiplicity of currently accepted detailed interpretations as discussed by the authors.
Abstract: A review of dielectric data for a wide range of solids proves the existence of a remarkable ‘universality’ of frequency and time responses which is essentially incompatible with the multiplicity of currently accepted detailed interpretations. Certain unique features of the universal behaviour strongly suggest the dominant role of many-body interactions.
4,234 citations
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01 Jan 1979TL;DR: In this article, a brief description is given of the various manifestations of the universal fractional power law relaxation processes, which are contrasted with the classical or Debye law, and a novel very general approach based on the so-called energy criterion is introduced.
Abstract: A brief description is given of the various manifestations of the universal fractional power law relaxation processes, which are contrasted with the classical or Debye law. It is shown that the universal law is indeed found in a remarkable variety of physical and chemical situations, and this is deemed to merit a special attempt at finding a suitably general theoretical model. Several such models are briefly described, and a novel very general approach based on the so-called energy criterion is introduced. It is concluded that it is not yet possible to establish with certainty the validity of any of the models. >
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TL;DR: A unique ammonia-assisted strategy to exfoliate bulk vanadium disulfide flakes into ultrathin VS(2) nanosheets stacked with less than five S-V-S single layers is developed, representing a brand new two-dimensional material having metallic behavior aside from graphene.
Abstract: With the rapid development of portable electronics, such as e-paper and other flexible devices, practical power sources with ultrathin geometries become an important prerequisite, in which supercapacitors with in-plane configurations are recently emerging as a favorable and competitive candidate. As is known, electrode materials with two-dimensional (2D) permeable channels, high-conductivity structural scaffolds, and high specific surface areas are the indispensible requirements for the development of in-plane supercapacitors with superior performance, while it is difficult for the presently available inorganic materials to make the best in all aspects. In this sense, vanadium disulfide (VS2) presents an ideal material platform due to its synergic properties of metallic nature and exfoliative characteristic brought by the conducting S–V–S layers stacked up by weak van der Waals interlayer interactions, offering great potential as high-performance in-plane supercapacitor electrodes. Herein, we developed a ...
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