Enhanced Potassium Storage Capability of Two-Dimensional Transition-Metal Chalcogenides Enabled by a Collective Strategy
نویسندگان
چکیده
Potassium-ion batteries (PIBs) have been considered as a promising alternative to lithium-ion due their merits of high safety and low cost. Two-dimensional transition-metal chalcogenides (2D TMCs) with theoretical specific capacities unique layered structures proven be amenable materials for PIB anodes. However, some intrinsic properties including severe stacking unsatisfactory conductivity restrict electrochemical performance, especially rate capability. Herein, we prepared heterostructure high-crystallized ultrathin MoSe2 nanosheet-coated multiwall carbon nanotubes investigated its view demonstrating the enhancement collective strategy K storage 2D TMCs. In such heterostructure, constructive contribution CNTs not only suppresses restacking nanosheets but also accelerates electron transport. Meanwhile, loaded on exhibit an feature, which can expose abundant active sites reaction shorten K+ diffusion length. Therefore, synergistic effect between endows resulting nanocomposite superior structural properties. Additionally, crystallinity further leads improvement performance. The composite electrode delivers high-rate 209.7 186.1 mAh g–1 at current densities 5.0 10.0 A g–1, respectively.
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ژورنال
عنوان ژورنال: ACS Applied Materials & Interfaces
سال: 2021
ISSN: ['1944-8244', '1944-8252']
DOI: https://doi.org/10.1021/acsami.1c01891