Resonant photoemission at the L3absorption edge of Mn and Ti and the electronic structure of 1T-Mn0.2TiSe2

Yablonskikh, M. V.; Shkvarin, A. S.; Yarmoshenko, Yu. M.; Skorikov, N. A.; Titov, A. N.

doi:10.1088/0953-8984/24/4/045504

Cited by 13 publications

(9 citation statements)

References 40 publications

(76 reference statements)

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“…[ 47–49 ] These modifications may be responsible for the enhanced synergistic adsorption of CTAB–MXene substrate for the polyselenides. The XPS spectrum of Ti 2p in Figure S9 in the Supporting Information further suggests that the CCNT/MXene/PP separator shows stronger Ti–Se binding energy (455 eV) [ 50 ] compared to that of MXene/PP separator after the first cycle, which is consistent with the calculation results.…”

Section: Resultssupporting

confidence: 81%

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

Zhang

Guo

Xiong

et al. 2020

Advanced Energy Materials

108

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However, the development of metal-Se batteries has been blocked by the severe shuttle effect of polyselenides, particularly in ether-based electrolyte, where the polyselenides diffuse across the separator and react with the metal anode. [12,13] Tremendous efforts have been devoted to the design of advanced cathode host materials to mitigate the shuttle effect. [14,15] These designed cathode strategies include: employing porous carbon materials as the hosts; [7,[16][17][18][19] coating the cathode materials with graphene, metal oxide, or conductive polymers; [20][21][22][23][24] and heteroatoms doping. [25][26][27] However, these cathode engineering would inevitably reduce the mass ratio of selenium by introducing additional components, leading to decreased energy density. [28] Recently, functional separators have been prepared to inhibit the shuttle effect in Se-or S-based batteries. [17,[29][30][31][32][33][34] For example, MXenes (M n+1 X n T x , where M = transition metal, X = carbon/nitrogen, n = 1, 2, and 3, and T x represents surface functional groups) modified separators have been proved to be effective in suppressing the shuttle effect due to their anisotropic shape and large 2D dimensions that increases the diffusion pathway of polysulfide/polyselenide species. [35][36][37] In addition, MXene shows strong adsorption to polysulfides due to the Lewis acid-base interaction between polysulfides and Ti sites, [38,39] which may also work for polyselenides. Nazar and co-workers have shown that the surface environment on MXene enhances such Lewis acid-base chemisorption via thiosulfate formation. [38] However, this enhanced adsorption undergoes a two-step process with sluggish kinetics. Although the shuttle effect can be mitigated, the battery showed slow redox reaction, especially under high current densities. In addition, the MXene nanosheets also suffer from restacking and poor electrolyte affinities due to the van der Waals (vdW) forces and rich hydrophilic surface groups (OH and F), respectively. [40,41] It is well known that the hydrophilic groups on MXene have low compatibility to organic electrolyte. [42] The inferior separator-electrolyte contact will lead to a poor solid-electrolyte interface (SEI) and slow electrolyte infiltration process. [43] Herein, we developed a novel self-assembled cetrimonium bromide (CTAB)/carbon nanotube (CNT)/Ti 3 C 2 T x MXene Selenium (Se), due to its high electronic conductivity and high energy density, has recently attracted considerable interest as a cathode material for rechargeable Li/Na batteries. However, the poor cycling stability originating from the severe shuttle effect of polyselenides hinders their practical applications. Herein, highly stable Li/Na-Se batteries are developed using ultrathin (≈270 nm, loading of 0.09 mg cm −2 ) cetrimonium bromide (CTAB)/carbon nanotube (CNT)/Ti 3 C 2 T x MXene hybrid modified polypropylene (PP) (CCNT/ MXene/PP) separators. The hybrid separator can immobilize the polyselenides via enhanced Lewis acid-base interactions betwee...

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Section: Resultssupporting

confidence: 81%

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

Zhang

Guo

Xiong

et al. 2020

Advanced Energy Materials

108

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“…It is shown previously that a chemical bond between Mn-atoms and host lattice in this compound is partially ionic as follows from the calculations 16 and experimental data. 11 In Cu 0.58 TiSe 2 , Cr 0.33 TiSe 2 , and Cr 0.5 TiTe 2 , the charge transfer probability has an intermediate value…”

Section: Resultsmentioning

confidence: 99%

“…18) in contrast to spectrum of Mn x TiSe 2 , which demonstrates drastically changes. 11 Cu XAS in Cu x TiSe 2 (x ¼ 0.05-0.33) are previously investigated.…”

Section: Resultsmentioning

confidence: 99%

Localization of charge carriers in layered crystals MexTiSe2 (Me = Cr, Mn, Cu) studied by the resonant photoemission

Yarmoshenko

Shkvarin

Yablonskikh

et al. 2013

Journal of Applied Physics

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The probability of charge transfer in layered titanium diselenide between monolayers containing Cr, Mn, and Cu with different concentrations and host lattice TiSe 2 is estimated according to the resonant photoemission data. For this purpose, the Raman-Auger contributions and narrow bands just below the Fermi energy were separated in the valence band spectra. These contributions provide the information about charge transfer. It is shown that the localization of the 3d electrons is typical for Cr and Cu atoms and strongly depends on theirs concentration. In Mn x TiSe 2 , Mn 3d electrons are delocalized and the probability of the charge transfer is the greatest as compared with other compounds under investigation. V C 2013 AIP Publishing LLC.

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“…The cause for the observed increase in the unit cell parameter c(x) can be either the ionic nature of the intercalant-lattice chemical bond, as is observed in materials intercalated with alkali metals [12,13], or the formation of hybrid states between the 3d states of the intercalant and the chalcogen, which is observed in the Mn x TiSe 2 system [14]. However, for the Fe x TiTe 2 system, the experi mental data on resonance photoemission spectros copy [1] clearly indicate a hybrid nature of the Fe3d/Ti3d states of the dispersionless bands.…”

Section: Crystal Structurementioning

confidence: 99%

Structure and properties of the intercalation compound Fe x TiTe2

et al. 2013

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Abstract-The Fe x TiTe 2 system, which belongs to the class of materials with the electronic spectrum con taining below the Fermi level the band of localized states with a strong temperature dependence of the band width, has been investigated experimentally. Heating of the material leads to a broadening of the band of localized states. When the top of this band crosses with the Fermi level, the effect of retrograde solubility is observed in the system; i.e., the metal precipitates to the composition ensuring the absence of increase in the Fermi energy during heating. The influence of the band of localized states on the structure of the material and its magnetic and electrical properties has been analyzed.

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Resonant photoemission at the L₃absorption edge of Mn and Ti and the electronic structure of 1T-Mn_0.2TiSe₂

Cited by 13 publications

References 40 publications

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

Interface Engineering of MXene Composite Separator for High‐Performance Li–Se and Na–Se Batteries

Localization of charge carriers in layered crystals MexTiSe2 (Me = Cr, Mn, Cu) studied by the resonant photoemission

Structure and properties of the intercalation compound Fe x TiTe2

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