量子电容的突出结构依赖被酸化石墨烯介质海绵揭开了
Rui Tang1,2, Alex Aziz2,3, Wei Yu2
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, China.
Small (Weinheim an der Bergstrasse, Germany)
|December 6, 2023
概括
添加多孔碳可通过增强总电容 (Ctot) 来显著提高超级电容器的能量密度. 这项研究探讨了异原子对碳电极性能的影响,以避免伪电容延长设备寿命.
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:
- 多孔碳是超级电容器的关键电极材料.
- 在不影响设备寿命的情况下提高超级电容器的能量密度是一个关键的挑战.
- 赫尔姆霍尔茨电容 (CH) 和量子电容 (CQ) 在碳材料中贡献了总电容 (Ctot).
研究的目的:
- 系统地研究异质原子功能对多孔碳电极的总电容 (Ctot) 的影响.
- 了解氧气和的兴奋剂如何影响超级电容器的性能.
- 为了将异质原子度与有机电解质的电容性行为相关联.
主要方法:
- 使用模板方法合成具有受控毛孔结构的3D中孔石墨烯.
- 含有氧的功能组 (0.3-6.7重量%) 和剂 (0.1-4.5重量%) 的度各不相同.
- 在有机电解质中进行电化学表征,以测量总电容 (Ctot).
主要成果:
- 发现异原子功能是Ctot的主要决定因素.
- 循环电压计曲线呈现矩形或蝶形状,表明不同的电容机制.
- 的功能显著增强了Ctot,这归因于量子电容 (CQ) 的增加.
结论:
- 异原子兴奋剂,特别是用,是增强超级电容器能量密度的一个有前途的策略.
- 控制异原子度可以调整电容性质.
- 兴奋剂对CQ的增强为高性能超级电容提供了一条途径,而无需依赖伪电容.
相关概念视频
MOS Capacitor
798
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
798
Equivalent Capacitance
1.4K
Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
The following strategies are adopted to calculate...
The following strategies are adopted to calculate...
1.4K
Dielectric Polarization in a Capacitor
4.7K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
4.7K
Capacitor With A Dielectric
4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
Capacitors and Capacitance
7.6K
A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
When the conductors are two identical parallel plates, it is called a parallel plate capacitor. When battery terminals are...
7.6K


