Enhanced Photogenerated Electron Transfer in a Semiartificial Photosynthesis System Based on Highly Dispersed Titanium Oxide Nanoparticles
Enhanced Photogenerated Electron Transfer in a Semiartificial Photosynthesis System Based on Highly Dispersed Titanium Oxide Nanoparticles
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基于高度分散的氧化钛纳米粒子的半人工光合作用系统中增强的光生电子转移
DOI：
10.1021/acs.jpclett.9b03740
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发表时间：
2020-03-05
影响因子：
5.7
通讯作者：
Song, Shiwei
中科院分区：
文献类型：
--
作者：
Pan, Xiaoqin;Li, Dongna;Song, Shiwei
在本研究中，构建了基于叶绿体（CLP）和二氧化钛纳米粒子（TiO2 NPs）的混合半人工光合作用系统。 TiO2/CLP 复合物还原 2,6-二氯苯酚吲哚酚 (DCPIP) 和 TiO2 还原亚甲蓝 (MB) 用于确定该混合系统中增强的光生电子转移。 TiO2/CLP 复合物的 DCPIP 还原显示出与 TiO2 的 MB 还原相同的趋势，作为 TiO2 NP 浓度的函数，表明 CLP 拦截 TiO2 中的光生电子，从而提高光合作用效率。与纯 TiO2 相比，TiO2/CLP 复合物的光致发光强度降低和激发态寿命缩短也支持电子从 TiO2 转移到 CLP。更长的可见光吸收波长和增加的价带边缘揭示了TiO2/CLP更窄的带隙，最终导致从TiO2到CLP的电子转移增强。 TiO2/CLP 复合物更高的铁氰化物还原性和增强的 ATP 形成表明电子转移链的电子转移速率加快。本研究揭示了TiO2如何与CLP相互作用，通过构建半人工光合作用系统来增强光合作用的机制。
In this study, a hybrid semiartificial photosynthesis system based on chloroplast (CLP) and titanium oxide nanoparticles (TiO2 NPs) was constructed. 2,6-Dichlorophenolindophenol (DCPIP) reduction by TiO2/CLP complex and methylene blue (MB) reduction by TiO2 were used to determine enhanced photogenerated electron transfer in this hybrid system. The DCPIP reduction by the TiO2/CLP complex showed the same trend as MB reduction by TiO2 as a function of concentration of TiO2 NPs, indicating interception of photogenerated electrons in TiO2 by CLP that leads to enhanced photosynthesis efficiency. Decreased photoluminescence intensity and shortened excited-state lifetime of the TiO2/CLP complex compared to that of pure TiO2 also support electron transfer from TiO2 to CLP. Longer visible light absorption wavelength and increasing valence band edges reveal the narrower band gap of TiO2/CLP, which finally results in the enhanced electron transfer from TiO2 to CLP. Higher ferricyanide reduction and enhanced ATP formation with the TiO2/CLP complex demonstrate the accelerated electron-transfer rate of the electron-transfer chain. This study reveals the mechanism of how TiO2 interacts with CLP to enhance the photosynthesis via constructing a semiartificial photosynthesis system.