Defined Intercalation Stages from Cathodic Reduction of MoS₂ in Organic Electrolytes

Abstract

Molybdenum, Intercalation Compounds, Cathodic Reduction, Organic ElectrolytesCathodic reduction of M0S2 in DMSO electrolytes containing alkali cations A+ results in the formation of defined ternary phases A+o.i25 (DMSO) y [MoS2] 0125_ with highly mobile solvated interlayer cations. Reduction of M0S2 in DME electrolytes yields similar products. Basal spacings are dependant on solvent type and on ionic radius of A+. Further reduction of these compounds is associated with irreversible processes.

Insertion Electrode Materials for Rechargeable Lithium Batteries

“…Intercalation of lithium into MoS 2 is accompanied by a structural change from prismatic to octahedral molybdenum coordination. [12,653] Due to the low free energy of formation of the host sulfide itself, a higher degree of lithium intercalation leads to the formation of Li 2 S and Mo metal. However, a better electrode behavior with a high degree of reversibility and a continuous discharge profile was observed for amorphous MoS 2 .…”

Solvated Intercalation Compounds of Layered Chalcogenide and Oxide Bronzes

“…Cointercalation of organic solvents upon reaction of dichalcogenides with lithium metal solutions in these solvents or by cathodic reduction of MX 2 electrodes in Li + /organic electrolytes has been described for hexamethylphosphotriamide, A^-methylformamide, propylene carbonate, dimethoxyethane, and dimethyl sulfoxide (M = Ti, Mo; X = S) (8,23,45,46). It is likely that the direct cointercalation of large organic solvent molecules is frequently prevented from taking place for kinetic reasons, which is of considerable importance for the use of dichalcogenide electrodes in Li + / organic batteries (8).…”

Improved HER Catalysis through Facile, Aqueous Electrochemical Activation of Nanoscale WSe2

“…We address the former through chemical removal of surface ligands and the latter through aqueous electrochemical activation in the presence of cations (protons and alkali metal cations) at low potentials. A related electrochemical activation process leading to increased HER kinetics has been associated with intercalation of H + in MoS 2 . , Examination of the intercalation chemistry literature pertaining to TMDCs reveals extensive research on intercalating neutral molecules, charged metal ions, and even zerovalent metal ions into the van der Waals gap through either physical or electrochemical means. ,,− Intercalation of metal ions into the van der Waals gap of TMDCs is typically conducted electrochemically or using strong reducing reagents, like alkyl lithium reagents. − Here we report the facile, aqueous electrochemical activation of colloidally synthesized TMDC nanocrystals with protons and alkali metal cations without the use of high potentials, organic solvents, or prior treatment with alkyl lithium reagents.…”