硫和波形堆叠在二维共价有机框架中提升了高级储存
Nana Li1,2, Jinhui Zhu1, Chongqing Yang3
1The Soft2D Lab, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai, 200240, China.
研究人员开发了两种用于储能的二维联共价有机框架 (c-COFs). 与平面COF-O相比,含硫c-COF (COF-S) 具有波形层显示出增强的离子可访问性和更高的容量.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 2D联共价有机框架 (c-COFs) 是储能有希望的有机电极材料.
- 在密集堆叠的c-COF中,有限的离子可访问性限制了它们的存储能力.
研究的目的:
- 设计和研究具有不同的层配置的2D c-COF,以改进能源存储.
- 阐明框架几何,离子可访问性和电化学性能之间的关系.
主要方法:
- 合成二氧化和迪桥接的二维c-COFs (COF-O和COF-S).
- 进行X射线衍射分析以确定层叠和几何.
- 电化学测试 (特定容量,循环寿命) 用于离子存储.
- 理论计算以了解离子储存机制.
主要成果:
- 由于曲的C─S─C键,COF-S表现出波浪状,波浪状的正方形平面网络,扩展层距离.
- COF-O显示密集的,完全平面的层.
- COF-S在0.5 A g-1下实现了1305 mAh g-1的优异特异容量,在5000个循环后保持80.4%.
- COF-S促进了增强的Li+可访问性和氧化还原活性,每核储存12Li+与COF-O中的8Li+相比.
结论:
- 在COF-S中波形堆叠几何学显著提高了离子可访问性和电化学性能.
- 在二维c-COF中,合硫和波纹层堆叠是调层距离和离子存储的关键因素.
- 这些发现为设计高性能储能设备的先进有机电极材料提供了洞察力.
更多相关视频
08:42Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
Published on: July 10, 2017
12:30Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
Published on: April 9, 2018
相关概念视频
Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Resonance and Hybrid Structures
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
Hybridization of Atomic Orbitals I
Ionic Bonding and Electron Transfer
Resonance
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
