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MM: Fachverband Metall- und Materialphysik

MM 65: Nanomaterials - II

MM 65.3: Vortrag

Donnerstag, 19. März 2020, 18:00–18:15, IFW D

Defect and interlayer engineering in transition metal dichalcogenides for enhancing potassium storage — •Yuhan Wu, Chenglin Zhang, and Yong Lei — Institut für Physik & IMN MacroNano, Technische Universität Ilmenau, 98693, Ilmenau, Germany

The role of the defect and interlayer engineering in two-dimensional transition metal dichalcogenides is explored for potassium storage. Molybdenum disulfide was selected as an example; the expanded interlayer spacing and defects in the basal planes are used as the anode of potassium-ion battery with voltage window of 0.5*2.5 V, which ensure the intercalation reaction rather than a conversion reaction takes place to store K-ions in the van der Waals gaps. In comparison to the defect-free counterpart with pristine interlayer spacing, the MoS2 nanoflowers showed enhanced potassium storage performance. Kinetic analysis verifies that the K-ion diffusion coefficient and surface charge storage are both enhanced. The collective effects of expanded interlayer spacing and additionally exposed edges induced by the in-plane defects enable facile potassium ion intercalation, rapid potassium ion transport and promoted surface K-ion adsorption at the same time.