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相关概念视频

Diffusion01:12

Diffusion

222.0K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
222.0K
Diffusion01:21

Diffusion

6.7K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Ion Channels01:19

Ion Channels

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The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
91.5K
Formation of Complex Ions03:45

Formation of Complex Ions

26.3K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Ions and Ionic Charges03:27

Ions and Ionic Charges

79.5K
In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
79.5K
Common Ion Effect03:24

Common Ion Effect

47.1K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
47.1K

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Updated: Feb 14, 2026

An Efficient Sample Preparation Method to Enhance Carbohydrate Ion Signals in Matrix-assisted Laser Desorption/Ionization Mass Spectrometry
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增强的离子扩散提高了N2-to-NH3电流效率在100mA cm-2时.

Qiang Zhang1, Huamin Li1,2, Peiping Yu3

  • 1Frontiers Science Center for Transformative Molecules, State Key Laboratory of Synergistic Chem-Bio Synthesis, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China.

Science (New York, N.Y.)
|February 12, 2026
PubMed
概括
此摘要是机器生成的。

电化学氨产量通过使用一种新型的分层固体电解质介相 (SEI) 提高了,这种介相增强了离子流. 这一突破提高了氨的生产率和能源效率,以实现可持续的化学合成.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 电化学 (N2) 减少为氨 (NH3) 合成提供了一个可持续的途径,可能减少碳排放.
  • 目前的方法受到缓慢的离子溶解和扩散在固体电解质介相 (SEI) 的限制,阻碍了NH3的生产力.
  • 开发高效的SEI架构对于推进环境温度和压力NH3生产至关重要.

研究的目的:

  • 为增强离子流量设计和实施一种新的分层SEI架构.
  • 提高电化学降解为氨的效率和生产率.
  • 调查新的SEI对高电流密度NH3生产的影响.

主要方法:

  • 制造一个分层的SEI,包括具有低离子结合亲和力和高离子导电性的无机材料.
  • 在二 ((oxalato) 酸盐电解质中SEI性能的电化学表征.
  • 测量法拉第克效率,能源效率和NH3生产的长期稳定性.

主要成果:

  • 新的SEI架构使离子流量增加了两个数量级.
  • 实现了98%的法拉代克效率和21%的能量效率,用于在100 mA cm-2.2时生产NH3.
  • 经过40个小时的运行,证明了Faradaic 80%的持续效率.

结论:

  • 协调的溶解:扩散层SEI设计显著提高了离子流量,以实现高效的电化学NH3生产.
  • 这一策略使得在工业相关的电流密度下实现高性能NH3合成.
  • 开发的SEI为可持续和低碳氨制造提供了一个有希望的途径.