通过交叉链接的二"量子体"增强氧化光合作用
Thomas Gobbato1, Francesco Rigodanza2, Elisabetta Benazzi3
1Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via L. Giorgieri 1, I-34127 Trieste, Italy.
Journal of the American Chemical Society
|July 26, 2022
概括
研究人员使用工程化量子体 (QS) 模仿自然光合作用. 这种新设计显著提升了氧光电流,
科学领域:
- 人工光合作用
- 超分子化学
- 纳米材料
背景情况:
- 光系统II (PSII) 是氧气生产的天然光电解剂,但在人工系统中复制其功能具有挑战性.
- 在
- 一些
- 这种假设表明PSII可以简化为用于氧化水的光催化体.
- 之前的工作是使用烯二胺 (PBI) 和四氨酸聚甲酸盐 (Ru4POM) 开发出以PSII为灵感的量子体 (QS).
研究的目的:
- 改进PSII模拟量子体 (QS) 的工程,并改善水溶解和光电流的产生.
- 研究交叉连接的QS-TEG结构的自组装和光催化特性.
- 阐明纳米阵列架构和水化在水氧化效率中的作用.
主要方法:
- 使用综合的超分子和点击化学策略,将PBI-QS与四乙烯糖醇 (TEG) 交叉链接器相结合,创建QS-TEG结构.
- 用于光电化学测量而制造的3D逆光氧化电极.
- 使用作用光谱,催化剂质量活性,光管理,光电化学阻抗光谱 (PEIS) 和拉曼映射来分析性能.
主要成果:
- 与之前的QS相比,QS-TEG结构表现出增加的水溶解和受控的生长.
- 在模拟太阳辐射 (8.5太阳) 下,氧光电流的增强达到了34%.
- 已证明高转换频率 (TOFmax = 0.096 ± 0.005 s-1) 和氧气演变的法拉第效率 (FEO2 > 95%).
结论:
- 交联的PBI/Ru4POM纳米阵列在高效的水氧化中起着至关重要的作用.
- 纳米阵列中的水友性/疏水性域的相互作用模仿了天然的甲状腺素,增强了光催化活性.
- 工程量子体代表了人工光合作用的重大进步,接近自然系统的效率.
相关概念视频
Oxygenic Photosynthesis
169
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...
169
Photosystem II
72.4K
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...
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
72.4K
Photosystem I
64.2K
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...
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...
64.2K
Photosystems
5.0K
Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
5.0K
The Z-Scheme of Electron Transport in Photosynthesis
10.5K
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...
10.5K
Anoxygenic Photosynthesis
131
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
131

![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
