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- Title
Boosting Na<sup>+</sup> Storage Ability of Bimetallic Mo<sub>x</sub>W<sub>1−x</sub>Se<sub>2</sub> with Expanded Interlayers.
- Authors
Shi, Nianxiang; Xi, Baojuan; Tian, Fang; Ma, Xiaojian; Li, Haibo; Feng, Jinkui; Xiong, Shenglin
- Abstract
In spite of the valuable advancements in the fabrication of transition‐metal selenides (TMSs)‐based hybrid structures, only single‐metal selenides have been obtained through most of the present methods. Herein, a facile room‐temperature self‐polymerization and subsequent selenization strategy is proposed for the synthesis of bimetallic MoxW1−xSe2 nanosheets with expanded interlayers decorated with N‐doped carbon‐matrix assembled flowerlike hierarchical microspheres (MoxW1−xSe2/NC). Depending on the excellent coordination ability of dopamine with metal ions, self‐formed flowerlike single precursors are harvested. The unique hybrid architecture benefits the penetration of the electrolyte, accelerates Na+ insertion/extraction kinetics, enhances electron‐transfer ability, and alleviates the volume expansion and aggregation during cycling processes. Therefore, the bimetallic MoxW1−xSe2/NC electrode delivers high reversible capacities of 264 mA h g−1 at 1 A g−1 for 700 cycles, 204.4 mA h g−1 at 4 A g−1 for 1400 cycles, and 153.3 mA h g−1 at 8 A g−1 for 2000 cycles, as well as an excellent rate capability up to 10 A g−1 with a capacity of 188.9 mA h g−1. Our study offers an effective strategy to boost sodium storage performance through elaborate structural engineering.
- Subjects
STRUCTURAL engineers; METAL ions; STORAGE; MICROSPHERES; SELENIDES
- Publication
Chemistry - A European Journal, 2020, Vol 26, Issue 43, p9580
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202000820