期刊
CHEMICAL ENGINEERING JOURNAL
卷 451, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138508
关键词
Sodium ion batteries; 2D-2D hybrid; MXene@Co9S8/CoMo2S4; In-situ etching and ion exchange; Ex-situ XRD and XPS
The 2D-2D MXene@Co9S8/CoMo2S4 heterostructure was successfully prepared through in-situ etching and ion exchange methods, improving the electrochemical performance of SIBs. The MXene flakes effectively suppressed the aggregation of nanosheets, increasing reactive sites and promoting charge transfer during the charge/discharge process.
2D-2D MXene@Co9S8/CoMo2S4 heterostructure has been successfully prepared by anchoring Co9S8/CoMo2S4 nanosheets on few-layered MXene through In-situ etching and ion exchange methods, as well as the subsequent sulfidation processes. MXene flakes used as substrate can effectively suppress the aggregation of Co9S8/CoMo2S4 nanosheets, which further increase reactive sites, ensure the full contact/infiltration of electrolyte, as well as promote charge transfer to improve the reversibility of redox reactions. Besides, this hierarchical structure of 2D -2D MXene@Co9S8/CoMo2S4 hybrids can provide buffer space for the volume expansion of electrode materials during the discharge/charge process. When applied as anode for SIBs, the hierarchical hybrids present superior electrochemical performances with outstanding rate capability (172 mAh/g at 5.0 A/g) and cycling stability (196 mAh/g at 1.0 A/g after 350 cycles), which were further demonstrated by the Ex-situ XRD and XPS results. This work provides an effective way to prepare heterostructure hybrid by combining MXene with binary metal sul-fides with unexpected performance in SIBs and may develop hybrid electrode materials for further application in commercial SIBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据