不对称的化学潜力激活的纳米界面电场,用于高效的氧化还原流电池
Xiangyang Zhang1,2, Xiaolin Ye1, Agnes Valencia2
1Shenzhen Key Laboratory of New Lithium-ion Batteries and Mesoporous Materials, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
ACS nano
|October 20, 2023
概括
研究人员使用二元Mo2C-Mo2N开发了纳米界面电场,用于全氧化还原流电池 (VRFB). 这提高了往返效率和电池寿命,超过了传统的催化剂.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 全氧化还原流电池 (VRFB) 需要高效的催化剂来提高能源效率和寿命.
- 目前的催化剂在封闭的微环境中面临着内在活动和可访问性的限制.
- 同时提高VRFB的往返效率和电池寿命仍然是一个重大挑战.
研究的目的:
- 为VRFBs设计具有卓越内在活动和可访问性的活跃站点.
- 研究纳米界面电场在增强电化学动力学中的作用.
- 开发一种新的催化剂系统,以提高VRFB性能.
主要方法:
- 二元Mo2C-Mo2N子网格的制造,显示纳米界面电场.
- 使用理论计算来理解异质接口上的电荷动态.
- 进行内在活动测试以评估催化剂性能.
- 用新型催化剂系统组装和测试VRFB.
主要成果:
- 由于不对称的化学潜力,二进制Mo2C-Mo2N子网格产生了类似加速器的电场 (E-field).
- 理论和实验数据证实了增强的离子吸附和电荷转移动力学.
- 该VRFB实现了77.7%的高能效,并保持了在300 mA cm-2.2下1000个循环.
- 性能超过了使用传统单一催化剂的VRFB.
结论:
- 来自二元Mo2C-Mo2N的纳米界面电场有效地提高了VRFB的性能.
- 工程活动场所表现出卓越的内在活动和可访问性.
- 这种方法为推进VRFB技术提供了一个有前途的战略,以实现高效和长期的储能.
相关概念视频
Voltaic/Galvanic Cells
57.4K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.4K
Batteries and Fuel Cells
27.6K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.6K
Voltammetry: Factors Affecting Measurements
162
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
162
Ladder Diagrams: Redox Equilibria
462
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
462
Electrolysis
26.6K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.6K
Standard Electrode Potentials
44.1K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
44.1K


