论文成果
Cationic/Anionic Vacancies Constructed in WSe<sub>2</sub> toward Enhanced Performance of Rechargeable Magnesium Batteries
- 发布时间：2024-12-24
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- 摘要：The development of appropriate cathodes has been deemed as the key for the commercial utilization of rechargeable magnesium batteries (RMBs) with a high electrochemical performance. In this work, both cationic (W) vacancies and anionic (Se) vacancies are constructed in a V-W/Se-WSe2 structure by a simple chemical vapor deposition (CVD) method, where rich Se vacancies are generated under a H-2 atmosphere, and W vacancies are established under an atmosphere of excess Se guided by absent solid solution formation theory. A series of characterization results reveal that rich W and Se vacancies would not only expose more active sites for adsorbing Mg2+ to enhancing specific capacity but also enhance ionic conductivity for facilitating Mg2+ diffusion to enhance rate capability. In addition, rich vacancies in the V-W/Se-WSe2 structure own enough space for alleviating the structural change during the Mg2+ insertion/extraction process, which is beneficial for enhancing the cycling stability. Therefore, V-W/Se-WSe2 delivers a higher specific capacity of about 140 mAh g(-1) at 50 mA g(-1), a superior rate capability of reversible specific capacity at 500 mA g(-1), and stable cycling performance with a specific capacity retention ratio of 97.6% after 2700 cycles at 1000 mA g(-1). This work provides new insights for defect engineering of cathode modification for enhancing the electrochemical performance of energy storage devices.
- 卷号：12
- 期号：37
- 是否译文：否