关于扭曲变形对WSe2作为离子电池的阳极材料的影响的第一原则研究
1Zhengzhou Railway Vocational Technical College, Zhengzhou, 450052, China. xiaoweiniu60@sina.com.
Journal of molecular modeling
|June 14, 2024
概括
扭曲变形和吸附显著改变了 tungsten diselenide (WSe2) 的电子特性,将其从半导体转变为金属. 这项研究为在离子电池中增强WSe2应用提供了洞察力.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算化学的计算化学
背景情况:
- 调查了内在和 (Ca) 吸附脱化 (WSe2) 的电子特性.
- 探讨扭曲变形对WSe2的半导体和金属行为的影响.
- 检查了Ca吸附稳定性及其对WSe2电子结构的影响.
研究的目的:
- 系统地研究扭矩变形对WSe2.2电子特性的影响.
- 分析Ca吸附对WSe2.2电子和结构性质的影响.
- 为改善WSe2在离子电池中的应用提供基础.
主要方法:
- 使用Materials Studio 8.0软件进行第一原则计算.
- 一般化梯度近似法 (GGA) 与佩尔杜 - 伯克 - 恩泽霍夫 (PBE) 的功能.
- 布劳登-弗莱彻-戈德法尔布-沙诺 (BFGS) 优化算法,具有特定的能量和力趋同标准.
主要成果:
- 在WSe2空位上,Ca被稳定地吸附,在未变形系统中吸附能量最高.
- 扭曲变形导致WSe2从直接间隙半导体过渡到间接间隙半导体,最后到金属状态.
- Ca吸附降低了导电带,引入了新的状态峰值密度,并降低了WSe2.2上的Ca扩散屏障.
结论:
- 扭曲变形和Ca吸附极大地改变了WSe2的电子带结构和特性.
- 的吸附增强了WSe2导电性,并降低了扩散障碍,这表明了电池应用的潜力.
- 该研究提供了优化WSe2在储能设备中的基础数据.
相关概念视频
Torsion of Noncircular Members
135
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
135
Thin-Walled Hollow Shafts
182
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
182
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
263
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
263


