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The Z-Scheme of Electron Transport in Photosynthesis01:34

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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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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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在可见光照射下用氧化物半导体光催化剂直接分裂水.

Z Zou1, J Ye, K Sayama

  • 1Photoreaction Control Research Center, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. z.zou@aist.go.jp

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|December 12, 2001
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概括
此摘要是机器生成的。

研究人员开发了新的-氧化物光催化剂,用于高效的太阳能驱动水分. 这些催化剂使用可见光产生和氧,为清洁的燃料生产提供了有前途的途径.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 光催化作用的光催化
  • 可再生能源可再生能源是可再生能源.

背景情况:

  • 太阳能提供了一种清洁的,可再生的来源,通过水分裂生产燃料.
  • 现有的光催化剂主要使用紫外线,由于太阳能利用率低,限制了实际应用.
  • 为可见光水分裂开发高效稳定的光催化剂仍然是一个重大挑战.

研究的目的:

  • 开发能够在可见光下有效地分裂水的新型光催化剂.
  • 为了研究兴奋剂对氧化物对增强光催化活性的影响.
  • 评估这些材料在生产清洁燃料方面的潜力.

主要方法:

  • 合成配的氧化物材料 (In{1-x}Ni{x}TaO{4)) 具有不同度的 (x = 0-0.2).
  • 在可见光照射下进行的光催化水分裂实验.
  • 量化气和氧气的生产和量子产量的确定.

主要成果:

  • 合成的In{1-x) Ni{x) TaO{4) 光催化剂在可见光下有效地将水分解为和氧.
  • 获得了大约0.66%的量子产量,表明显著的光催化活性.
  • 用对氧化物进行注,提高了其可见光驱动水分的性能.

结论:

  • 用添加的氧化物为可见光驱动水分裂提供了一类可行的光催化剂.
  • 这一进步更接近于实现太阳能作为清洁燃料的实际来源.
  • 对于实际应用,还需要进一步提高催化效率,例如增加表面积和表面现场修改.