在使用银聚氧金属集的电极架构中探索和开发可逆氧反应的策略
Jian Chuan Ye1, Jia Jia Chen2, Ru Ming Yuan1
1Department of Chemistry, College of Chemistry and Chemical Engineering, Collaborative Innovation Centre of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University , Xiamen, Fujian 361005, China.
Journal of the American Chemical Society
|February 10, 2018
概括
这项研究引入了用于硫电池的新型Ag ((I) 替代Keggin催化剂. 催化剂稳定了多硫化物,使得硫的利用率高,电池性能优异.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- -硫 (Li-S) 电池具有较高的理论能量密度,但受到多硫化物转移的影响.
- 稳定聚硫化物对于提高Li-S电池性能和循环寿命至关重要.
研究的目的:
- 调查使用双功能的Ag (I) 替代Keggin聚氧金属酸盐 (AgPOM) 作为稳定Li2Sn部分的催化剂.
- 探索AgPOM在硫基电极中促进可逆氧化还原反应的催化活性.
主要方法:
- 用Ag ((I) 替代的Keggin催化剂K3[H3AgIW11O39) 的合成和表征.
- 对AgPOM集群上Li2Sn部分的吸附进行光谱研究.
- 密度函数理论 (DFT) 的计算,以合理化Ag ((I) 和硫种之间的相互作用.
- 使用AgPOM的Li-S电池电极的制造和电化学测试.
主要成果:
- 通过强烈的吸附,AgPOM有效地稳定了Li2Sn部分,Ag(I) 作为易斯酸位点.
- DFT计算证实了AgPOM上硫种的增强吸附.
- 使用AgPOM的电极实现了94%的高硫利用率和1580mAhg-1的度容量.
- 复合电极在高频率下表现出稳定的循环性能 (1°C时为1050 mAh g-1,在2°C时为810 mAh g-1).
结论:
- 通过稳定聚硫化物,AgPOM催化剂显著提高了Li-S电池的性能.
- 作为易斯酸和基本催化剂的AgPOM的双功能性是其有效性的关键.
- 这种方法可以实现高活性硫含量和高面积硫负载,从而产生稳定和高性能Li-S电池.
相关概念视频
Redox Reactions
59.0K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
59.0K
Redox Reactions
1.2K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
1.2K
Balancing Redox Equations
62.6K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
62.6K
Standard Electrode Potentials
50.6K
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...
50.6K
Types of Chemical Reactions: Exchange and Reversible
12.1K
An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released.
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
12.1K
Chemical Reactions in Aqueous Solutions
72.7K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
72.7K


