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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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The Electron Transport Chain01:30

The Electron Transport Chain

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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
Inhibitors of the electron transport chain
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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Electron Transport Chain Components01:29

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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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工程电子辐射效应用于固态电解质中的快速Li运输.

Jiadong Shen1, Gilseob Kim1, Jong-Woan Chung1

  • 1Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea.

Advanced materials (Deerfield Beach, Fla.)
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概括

研究人员为固态电解质开发了一种新的"辐射效应"设计,提高离子电导率和金属电池的稳定性,以提高性能和安全性.

关键词:
闪光 焦力加热 加热基于的描述符.机器学习就是机器学习.辐射效应工程是指辐射效应工程.sd/pd杂交方式的混合化.

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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
  • 固态化学 固态化学

背景情况:

  • 固态电解质对于先进的金属电池至关重要,但在实现高离子导电性,转移数和接口稳定性方面面临挑战.
  • 目前的电解质设计难以平衡这些关键性质,阻碍了下一代储能技术的发展.

研究的目的:

  • 为固态电解质引入一种新的辐射效应设计原理.
  • 利用相对论效应和机器学习来发现新的电解质材料.
  • 为了设计高性能,耐热的固态电池.

主要方法:

  • 引入了一个辐射效应设计原理,涉及相对论扩张和5d轨道的旋转轨道合.
  • 开发了一种基于的描述符 (Sd),在超过10,000个材料中使用机器学习进行训练.
  • 利用机器学习引导的高通量选来识别单临床HfO.
  • 采用毫秒闪光焦勒加热来合成纳米尺寸的HfO2晶体.
  • 制造的sc-HfO2@LCB复合电解质和组装的金属袋细胞.

主要成果:

  • 在HfO2中的辐射效应工程显著降低了Li+的迁移障碍.
  • sc-HfO2电解质表现出高的Li导电性 (1.23mS cm-1在30°C) 和转移数 (tLi+=0.82在25°C).
  • 实现了广泛的电化学窗口 (4.8V),并通过Raman/XANES操作证实了更快的Li运输.
  • 在2Ah LiNi0.9Co0.05Mn0.05O2‖Li袋细胞中表现出卓越的性能,达到~472 Wh kg-1 (堆级) 并在数百个周期中保持速度能力.
  • 细胞在150°C的热板测试中幸存下来,表明增强了热弹性.

结论:

  • 辐射效应工程是设计先进固态电解质的强大策略.
  • 开发的基于HfO2的电解质为实现高性能,安全和热稳定的金属电池提供了有前途的途径.
  • 这种方法可以创建相互连接的+通路,这对于有效的离子运输至关重要.