异质结
纳米片
材料科学
密度泛函理论
电场
阳极
原子轨道
电子
相(物质)
X射线吸收精细结构
储能
吸收(声学)
纳米技术
光电子学
化学工程
化学物理
电极
化学
复合材料
物理化学
物理
热力学
计算化学
量子力学
功率(物理)
有机化学
光谱学
工程类
作者
Hui Peng,Wenxing Miao,Jingtian Zeng,Zihao Wang,Chenhui Yan,Guofu Ma,Ziqiang Lei
标识
DOI:10.1002/advs.202417288
摘要
1T-MoS2 is considered an attractive energy storage material due to its large layer spacing and excellent electrical conductivity. Unfortunately, 1T-MoS2 is difficult to synthesize directly due to the substability, which limits its development and application. Electron-filling engineering of Mo 4d orbitals is the core idea to induce an efficient conversion of 2H to 1T phase. Based on this theory, a homogeneous CuS@MoS2 heterogeneous nanosheet is successfully constructed based on electron-rich CuS as an electron donor. Both density functional theory (DFT) and X-ray absorption fine structure analysis (XAFS) illustrate that part of the electrons from Cu at the heterogeneous interface are transferred to Mo, which triggers the reorganization of Mo 4d orbitals and the formation of a strong built-in electric field at the interface, and induces an irreversible phase transition from 2H to 1T in MoS2. Based on its structural features, CuS@MoS2 heterogeneous nanosheets have a high first discharge capacity of 725 mAh g-1 at 0.1 A g-1, excellent rate performance (466.73 mAh g-1 at 10 A g-1), and long cycle stability (506.03 mAh g-1 after 3200 cycles at 5 A g-1). This work provides new perspectives for the development of high-performance sodium storage anode materials based on 1T-rich MoS2.
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