阳极
双金属片
石墨烯
材料科学
插层(化学)
电化学
氧化物
化学工程
纳米技术
电极
无机化学
化学
冶金
金属
工程类
物理化学
作者
Yanan Xu,Xiaofeng Liu,Hang Su,Shan Jiang,Jianmin Zhang,Dan Li
出处
期刊:Energy & environmental materials
日期:2021-06-28
卷期号:5 (2): 627-636
被引量:67
摘要
As anode materials for high‐performance sodium‐ion batteries and potassium‐ion batteries, bimetallic selenides have attracted great concern due to their relatively high electrical conductivity and electrochemical activity. However, the formidable challenge in the reaction process is the large volume change, leading to the structural collapse of material, and eventually the decline in electrochemical performance. Herein, a composite of hierarchical CoSe 2 –MoSe 2 tubes anchored on reduced graphene oxide nanosheets (CoSe 2 –MoSe 2 /rGO) is designed by an in situ hydrothermal selenization treatment. Benefiting from the synergistic effects between CoSe 2 and MoSe 2 , unique hierarchical structure, and effective reduced graphene oxide coating, the CoSe 2 –MoSe 2 /rGO exhibited improved reaction kinetics and structural stability, and thus good electrochemical properties. A combination mechanism of intercalation and conversion of CoSe 2 –MoSe 2 /rGO by forming Na x CoSe 2 and Mo 15 Se 19 as intermediate states is put forward on the basis of in situ and ex situ XRD analyses.
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