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Dopant-enhanced sodium and potassium-ion adsorption and diffusion in two-dimensional titanium disulfide
- Source :
- Journal of Applied Physics. 133:064302
- Publication Year :
- 2023
- Publisher :
- AIP Publishing, 2023.
-
Abstract
- Two-dimensional (2D) titanium disulfide (TiS[Formula: see text]) is the lightest transition-metal dichalcogenide (TMD). It exhibits relatively better adsorption and diffusion of sodium (Na) and potassium (K) ions than other TMDs, such as MoS[Formula: see text] (molybdenum disulfide) and ReS[Formula: see text] (rhenium disulfide), making it a promising anode material for alkali-ion batteries. Previous studies have found that doping significantly enhances the adsorption and diffusion capabilities of 2D TMDs. For the first time, this work reports the adsorption of Na and K ions on doped TiS[Formula: see text] monolayers using first-principles calculations, where the Ti atom is substituted by 3d-transition metals, including iron (Fe), cobalt (Co), nickel (Ni), and copper (Cu). Metal-atom doping induces remarkably stronger binding of alkali ions on the surface of TiS[Formula: see text], with adsorption energies ranging from [Formula: see text]2.07 to [Formula: see text]2.48 eV for Na and [Formula: see text]2.59 to [Formula: see text]3.00 eV for K. The diffusion barrier energies for alkali ions decrease in the proximity of the doping site and increase as the ions travel away from the doping site for Fe-, Co-, and Ni-doped TiS[Formula: see text]. The average open circuit voltage increases dramatically when Na ions are adsorbed on Fe-doped TiS[Formula: see text] (by 62%) and Co-doped TiS[Formula: see text] (by 61%), while K ions result in a moderate improvement of 9% and 8%, respectively. These findings suggest that metal-atom doping considerably improves the electrochemical properties of 2D TiS[Formula: see text], potentially enabling its use as anode materials in Na- and K-ion batteries.
- Subjects :
- General Physics and Astronomy
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 133
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........7ad5c8049e7b78a82dae61ccf27fa799