Photoelectric Conversion System Composed of Gene-Recombined Photosystem I and Platinum Nanoparticle Nanosheet
Photoelectric Conversion System Composed of Gene-Recombined Photosystem I and Platinum Nanoparticle Nanosheet
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基因重组光系统I与铂纳米颗粒纳米片组成的光电转换系统
DOI：
10.1021/acs.langmuir.0c00647
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Nishihara Hiroshi
中科院分区：
文献类型：
--
作者：
Zhu Wenchao;Salles Raphal;Miyachi Mariko;Yamanoi Yoshinori;Tomo Tatsuya;Takahashi Hiromi;Nishihara Hiroshi
光合作用是自然界中最重要的过程之一，它由两个主要的光反应中心组成，称为光系统I和光系统II。光系统I（PSI）的高量子产率使其在生物电子学应用中具有吸引力。然而，天然PSI（N-PSI）一旦被制造成器件就失去其稳健的光化学性质。这种性能下降的原因是难以控制PSI的取向。由于PSI的最佳取向，光激发电子可以容易地到达电极，产生良好的光电转换效率。我们开发了一种新的光电极，通过集成一个新设计的基因重组PSI（G-PSI）与铂纳米粒子（PtNPs）的基板上使用一个简单的堆叠方法，它可以控制PSI在电极上的取向。通过偏振光的吸收光谱证实了附着的G-PSI朝向基底的目标取向。与N-PSI修饰的电极相比，在680 nm照射下观察到G-PSI连接的电极的内量子产率（IQY）增加约2倍。此外，由于静电相互作用，检测到细胞色素（Cytc）在G-PSI上堆积的IQY增加了4倍，表明Cytc成功地保护了电子传递途径。
Photosynthesis is one of the most vital processes in nature, which consists of two main photoreaction centers called photosystem I and photosystem II. The high quantum yield of photosystem I (PSI) makes it attractive for bioelectronic applications. However, the native PSI (N-PSI) loses its robust photochemical properties once fabricated into devices. This property degradation results from the difficulty in controlling the orientation of PSI. With the optimal orientation of PSI, photoexcited electrons can easily reach the electrode, yielding good photoelectric conversion efficiency. We developed a novel photoelectrode by integrating a newly designed gene-recombined PSI (G-PSI) with platinum nanoparticles (PtNPs) on substrates using a simple stacking method, which can control the orientation of PSI on the electrode. The target orientation of the attached G-PSI toward the substrate was confirmed by the absorption spectra of polarized light. An approximately 2-fold increase in the internal quantum yield (IQY) was observed for the G-PSI-attached electrode under 680 nm irradiation compared with that of the N-PSI-modified electrode. In addition, a 4-fold enhancement of the IQY was detected for cytochromec(Cytc) stacking on the G-PSI because of the electrostatic interaction, suggesting that Cytcsuccessfully secured the electron-transfer pathway.