التفاصيل البيبلوغرافية
| العنوان: |
Scanning Photoelectrochemical Microscopic Study in Photoinduced Electron Transfer of Supramolecular Sensitizers-TiO2 Thin Films Systems. |
| Alternate Title: |
通过扫描光电化学显微镜研究超分子光敏剂-二氧化钛薄膜系统的光诱导电子转移. (Chinese) |
| المؤلفون: |
Sheng-Ya Zhang, Min Yao, Ze Wang, Tian-Jiao Liu, Rong-Fang Zhang, Hui-Qin Ye, Yan-Jun Feng, Xiao-Quan Lu |
| المصدر: |
Journal of Electrochemistry; 2023, Vol. 29 Issue 6, p1-12, 12p |
| مصطلحات موضوعية: |
TITANIUM dioxide, THIN films, PHOTOINDUCED electron transfer, PHOTOELECTROCHEMICAL cells, MICROSCOPY |
| Abstract (English): |
Crafting charge transfer channels at titanium dioxide (TiO2) based photoanodes remain a pressing bottleneck in solar-to-chemical conversion technology. Despite the tremendous attempts, TiO2 as the promising photoanode material still suffers from sluggish charge transport kinetics. Herein, we propose an assembly strategy that involves the axial coordination grafting metalloporphyrin-based photosensitizer molecules (MP) onto the surface-modified TiO2 nanorods (NRs) photoanode, forming the composite MP/TiO2 NRs photoelectrode. As expected, the resulted unique MPB/TiO2 NRs photoelectrode displays significantly improved photocurrent density as compared to TiO2 NRs alone and MPA/TiO2 NRs photoelectrode. Scanning photoelectrochemical microscopy (SPECM) and intensity modulated photocurrent spectroscopy (IMPS) were employed to systematically evaluate the continuous photoinduced electron transfer (PET) dynamics for MP/TiO2 NRs photoelectrode. According to the data fitting, it is found that the photoelectron transfer rate (keff) constant for the MPB/TiO2 NRs is about 2.6 times higher than that for the pure TiO2 NRs under light irradiation. The high kinetic constant for the MPB/TiO2 NRs was ascribed to that the conjugated molecules MPB of D-A structure can effectively accelerate intramolecular electrons transfer as well as promote electrons taking part in the reduction reaction of I3- to I- in the novel charge transfer channel. The results demonstrated in this study are expected to shed some light on investigating the mechanism in the charge transfer process of artificial photosynthesis and constructing efficient photoelectrodes. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
在基于TiO2的光阳极上枝接电荷转移通道仍然是太阳能到化学转换技术的一个迫切瓶颈。尽管进行了大量的尝试，但TiO2作为有前途的光阳极材料仍然受到电荷传输动力学迟缓的影响。因此，一种组装策略涉及将金属卟啉基光敏剂分子（MP）轴向配位嫁接到表面改性的TiO2纳米棒（TiO2 NRs）光阳极上，形成复合MP/TiO2 NRs光电极。正如预期的那样，与单独的TiO2 NR和MPA/TiO2 NRs光电极相比，所得到的独特的MPB/TiO2 NRs光电极具有明显提高的光电流密度。采用扫描光电化学显微镜（SPECM）和强度调制光电流光谱（IMPS）系统地评估了MP/TiO2 NRs光电极的连续光激发电子转移（PET）动力学信息。通过数据拟合发现，在光照条件下，MPB/TiO2 NRs的光电子转移速率（keff）常数比纯TiO2 NRs高2.6倍左右。MPB/TiO2 NRs的高动力学常数是由于D-A结构的共轭分子MPB可以有效地加速分子内电子转移，以及促进电子在新型电荷转移通道中参与I3-到I-的还原反应。本研究展示的结果有望为研究人工光合作用电荷转移过程的机制和构建高效的光电极提供一些启发。 [ABSTRACT FROM AUTHOR] |
|
Copyright of Journal of Electrochemistry is the property of Journal of Electrochemistry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Complementary Index |
