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相关概念视频

Photosystem I01:27

Photosystem I

62.8K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

10.2K
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...
10.2K
Photosystem II01:22

Photosystem II

71.0K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
71.0K
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

31
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
31
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.9K

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相关实验视频

Updated: Jul 15, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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基于有机金属化物罗夫斯基特的光电化学模块系统用于可扩展的无助太阳能水分系统.

Hojoong Choi1, Sehun Seo2,3,4, Chang Jae Yoon5

  • 1School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 27, 2023
PubMed
概括

研究人员为有机金属化物矿 (OHP) 光电化学系统开发了一种可扩展的模块化设计. 这种方法克服了扩大OHP光电的挑战,以实现高效的太阳能分水应用.

关键词:
模块 模块 模块 模块 模块 模块有机金属化物洛夫斯基特光电化学水分离器的使用可扩展的可扩展的可扩展.无助的太阳能水分离器

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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相关实验视频

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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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科学领域:

  • 材料科学 材料科学 材料科学
  • 可再生能源可再生能源是可再生能源.
  • 电化学 电化学 电化学

背景情况:

  • 有机金属化物矿 (OHPs) 在光电化学 (PEC) 应用中显示出前景.
  • 扩大基于OHP的PEC系统用于太阳能分水面临着阻力损失和缺陷等挑战.

研究的目的:

  • 为基于OHP的PEC系统提出一个可扩展的设计.
  • 解决阻碍OHP光电极在大型系统中的实际应用的障碍.

主要方法:

  • 优化OHP光电极的模块化.
  • 一个16光电极OHP PEC模块的构造.
  • 在自然阳光下测试PEC性能,没有外部偏差.

主要成果:

  • 在优化的OHP光电极中实现了高太阳能转换效率10.4%.
  • 模块化OHP PEC系统表现出最佳性能,避免了扩展障碍.
  • 从16电极模块在自然阳光下产生11.52mA的光电流,没有外部偏差.

结论:

  • 模块化设计成功实现了无助太阳能分水.
  • 这种方法为设计可扩展的OHP基于PEC系统的商业化提供了洞察力.