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相关概念视频

Electrolysis03:00

Electrolysis

26.4K
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...
26.4K
Alkali Metals03:06

Alkali Metals

19.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.3K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.5K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.8K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.8K

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优化聚硫化物用于高性能硫电池.

Wanqing Song1, Xinyi Yang1, Tao Zhang1

  • 1School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin, China.

Nature communications
|February 2, 2024
PubMed
概括

研究人员通过优化多硫化物开发了一种用于高性能硫电池的新策略. 这种方法提高了硫的利用率和电池寿命,为先进的储能解决方案铺平了道路.

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科学领域:

  • 储能 储能 储能 储能 储能 储能
  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学

背景情况:

  • 硫电池 (KSB) 提供高能量密度和低成本.
  • 在实现高硫利用率和长期循环稳定性方面仍然存在挑战.
  • 优化聚硫化中间体对于KSB的性能至关重要.

研究的目的:

  • 为高绩效的KSB制定一种新的战略.
  • 设计一种复合材料,增强多硫化的迁移和转化.
  • 改善KSB中的硫利用和循环稳定性.

主要方法:

  • 理论选用于设计一个单原子和碳化物复合材料.
  • 合成了一种具有特定连接体环境的金属有机框架.
  • 金属有机框架的热解产生了单个原子和碳化物纳米晶体.
  • 在高速率和长周期条件下评估了电化学性能.

主要成果:

  • 复合材料在聚硫化物迁移和转化方面表现出双重功能.
  • 碳化催化了多硫化的转化,而单个原子则促进了多硫化的迁移.
  • 这大大减少了绝缘硫化物积累和催化中毒.
  • 该KSB实现了89.8%的硫利用率 (1504mAh-1) 和在25°C的200个循环.
  • 在1675mAg-1时,表现出1059mAhg-1的优越速率能力.

结论:

  • 开发的战略有效地优化了高性能KSB的多硫化物.
  • 单个原子和碳化复合物增强了电化学效率和循环稳定性.
  • 这项工作为KSB的未来发展提供了一个有希望的方向.