Fullerene‐like Mo(W)1−xRexS2 Nanoparticles

Deepak, Francis Leonard; Popovitz‐Biro, Ronit; Feldman, Yishay; Cohen, Hagai; Enyashin, Andrey N.; Seifert, Gotthard; Tenne, Reshef

doi:10.1002/asia.200800083

Cited by 35 publications

(27 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(Figure 3b and c). First, the substitution of Mo with Re in the MoS 2 structure serves as n-type doping, [9] which results in improved electrical conductivity owing to the increased number of charge carriers,a llowing facile conduction. Previously, Tiong et al reported ad ramatic decrease in electrical re- sistivity with increasing rhenium doping concentration of bulk MoS 2 crystals.…”

Section: R Esults and Discussionmentioning

confidence: 99%

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

Woo

Yadgarov

Rosentsveig

et al. 2015

Israel Journal of Chemistry

Self Cite

View full text Add to dashboard Cite

[a] 1I ntroductionSodium ion batteries (SIBs) have been regarded as an attractive category among next-generation batteries.[1] Since lithium and sodium have similar electronic configurations, belonging to Group 1, they share similar physical and chemical properties.T hus,t he well-developed synthetic protocols and characterization methods of lithium ion batteries (LIBs) have been efficiently applied to construct sodium-based analogues.[2] However, thermodynamic and kinetic dissimilarities are also observed. Ther adius of Na + ion (102 pm) is about 1.34 times larger than that of Li + ion (76 pm). Thet wo alkali metals have different redox potentials (À3.04 and À2.71 Vv s. standard hydrogen electrode (SHE) for lithium and sodium, respectively). Moreover, they show different bonding energies.F or example,t he formation energy of Li 2 O( À 599 kJ/mol) is much greater than that of Na 2 O( À418 kJ/mol).Recently,t he group of Ceder investigated alkali-metalion-based insertion chemistry in terms of diffusion barrier, phase stability,a nd voltage difference.[1b] Va rious transition-metal-based compounds were examined, including layered AMO 2 and AMS 2 (A = Li, Na;M = Co,N i, Ti), olivines,m aricites, as well as sodium superionic conductors (NASICONs). Surprisingly,t hey demonstrated that sodium ion migration barriers could be lower than that for lithium ion migration by utilizing the layered compounds as host materials.A lthough various metal sulfides have been examined as hosts of lithium-ion intercalation for rechargeable batteries, [3] there have been few reports on sodium-ion rechargeable batteries with transition metal sulfides (TMS) as electrode materials.[4]Herein, we first compare inorganic fullerene-like MoS 2 (IF-MoS 2 )a nd Re-doped MoS 2 (Re:IF-MoS 2 )n anopartiAbstract:S odium ion batteries (SIBs) are considered as ap romising alternative to threaten the reign of lithium ion batteries (LIBs) among various next-generation rechargeable energy storage systems, including magnesium ion, metalÀ air,a nd metalÀsulfur batteries. Since both sodium and lithium are located in Group 1o ft he periodic table, they share similar (electro)chemical properties with regard to ionization pattern, electronegativity,a nd electronic configuration; thus the vast number of compounds developed from LIBs can provide guidance to design electrode materials for SIBs. However,t he larger ionic radius of the sodium cation and unique (de)sodiation processes may also lead to uncertainties in terms of thermodynamic or kinetic properties. Herein, we present the first construction of SIBs based on inorganic fullerene-like (IF) MoS 2 nanoparticles. Closedshell-type structures, represented by C 60 fullerene, have largely been neglected for studies of alkali-metal hosting materials due to their inaccessibility for intercalating ions into the inner spaces. However,I F-MoS 2 ,w ith faceted surfaces, can diffuse sodium ions through the defective channels, thereby allowing reversible sodium ion intercalation/deintercalation. Interestingly,R e-doped MoS...

show abstract

Section: R Esults and Discussionmentioning

confidence: 99%

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

Woo

Yadgarov

Rosentsveig

et al. 2015

Israel Journal of Chemistry

Self Cite

View full text Add to dashboard Cite

show abstract

“…A detailed account of the synthesis of the undoped and doped IF-MoS 2 NP can be found in Refs. [10][11][12], respectively. In brief, small amount of ReO 3 was mixed with MoO 3 powder and annealed at 750°C.…”

Section: Methodsmentioning

confidence: 98%

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

et al. 2011

View full text Add to dashboard Cite

The electrostatic effects in tribological systems have been studied in the past, especially with regards to data storage media. Nanoparticles (NP) of WS 2 and MoS 2 with fullerene-like structure (IF) have been studied in the past and showed very good tribological behavior. Being semiconductors, their electrical properties can be controlled by, e.g., substituting the lattice Mo (W) atoms with Re (n-type conductivity) and Nb (p-type conductivity) atoms. In this study doping of IF-MoS 2 , and to a lesser degree IF-WS 2 , NP with small amounts (\ 1 at.%) of rhenium atoms has been studied. For this purpose two new synthetic approaches have been pursued. The doped nanoparticles were characterized by various techniques. In particular, the doping density was determined by ICP-MS technique. The resistivity of the nanoparticles was shown to decrease significantly with increasing doping level. In contrast to the undoped nanoparticles, the doped NP were shown to exhibit reduced agglomeration and produce stable suspensions in PAO-4 and PAO-6 oils. Extensive tribological measurements with these PAO oils formulated with 1 wt % of the doped NP showed friction coefficients as low as 0.01 in mixed lubrication conditions and negligible wear. Microscopy analysis of the tribological surfaces reveal very smooth but discontinuous and dense film of the doped NP on the tribological surfaces. It is proposed that the doped NP are negatively charged at their surface eliciting mutual repulsion, which has a remarkable influence on their rheological properties and their tribological behavior.

show abstract

“…A recent trend in the synthesis of the fullerenes is to prepare faulted and strained IF nanostructures to facilitate their exfoliation in the tribological contact and thus to optimize the tribological properties of the lubricant [8]. Recently, some metal-doped fullerenes were also prepared [9,10]. The strain resulting from the metal defects in the lattice might lead to interesting tribological effects.…”

Section: Introductionmentioning

confidence: 98%

Understanding the Tribochemical Mechanisms of IF-MoS2 Nanoparticles Under Boundary Lubrication

et al. 2010

View full text Add to dashboard Cite

Inorganic fullerene-(IF)-like nanoparticles made of metal dichalcogenides (IF-MoS 2 , IF-WS 2 ) have been known to be effective as anti-wear and friction modifier additives under boundary lubrication. The lubrication mechanism of these nanoparticles has been widely investigated in the past and it is now admitted that their lubrication properties are attributed to a gradual exfoliation of the external sheets of the particles during the friction process leading to their transfer onto the asperities of the reciprocating surfaces. However, the chemical interaction between these molecular sheets and the rubbing surfaces has so far never been investigated in detail. In this study, the tribochemistry of the IF nanoparticles was carefully investigated. A series of friction test experiments on different rubbing surfaces (Steel, Alumina, Diamond-Like Carbon) were performed with IF-MoS 2 nanoparticles. High-resolution transmission electron microscopy, scanning electron microscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the tribostressed areas on rubbing surfaces. A tribofilm composed of hexagonal 2H-MoS 2 nanosheets was only observed on the steel surface. This transfer film was found to be incorporated into an iron oxide layer. A tribochemical reaction between the 2H-MoS 2 nanolayers and the iron/iron oxide has been proposed as an explanation for the adhesion of this tribofilm. The tribochemical mechanism of the IF-MoS 2 nanoparticles is discussed in this article.

show abstract

Fullerene‐like Mo(W)_1−xRe_xS₂ Nanoparticles

Cited by 35 publications

References 59 publications

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

Understanding the Tribochemical Mechanisms of IF-MoS2 Nanoparticles Under Boundary Lubrication

Contact Info

Product

Resources

About

Fullerene‐like Mo(W)1−xRexS2 Nanoparticles

Cited by 35 publications

References 59 publications

Fullerene‐like Re‐Doped MoS2 Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

Fullerene‐like Re‐Doped MoS2 Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

High Lubricity of Re-Doped Fullerene-Like MoS2 Nanoparticles

Understanding the Tribochemical Mechanisms of IF-MoS2 Nanoparticles Under Boundary Lubrication

Contact Info

Product

Resources

About

Fullerene‐like Mo(W)_1−xRe_xS₂ Nanoparticles

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries

Fullerene‐like Re‐Doped MoS₂ Nanoparticles as an Intercalation Host with Fast Kinetics for Sodium Ion Batteries