https://scholars.lib.ntu.edu.tw/handle/123456789/407518
標題: | π-Conjugated Organic–Inorganic Hybrid Photoanodes: Revealing the Photochemical Behavior through In Situ X-Ray Absorption Spectroscopy | 作者: | Hsu, C.-S. Węcławski, M.K. Koszarna, B. Gryko, D.T. Chen, H.M. |
關鍵字: | heterocycles; photoanode; small-molecule semiconductor; X-ray absorption | 公開日期: | 2018 | 卷: | 24 | 期: | 69 | 起(迄)頁: | 18419-18423 | 來源出版物: | Chemistry - A European Journal | 摘要: | Small-molecule organic semiconductors exhibit great potential for the photoelectrochemical oxidation of water because of their n-type semiconductor nature and their tunable bandgaps. In this work, several head-to-tail bis-coumarins were synthesized and their photophysical properties characterized. Their characteristics as n-type semiconductors were modified by varying the electronic character of substituents at positions 1 and 7, which enabled the energy level of the LUMO and the photoinduced charge-carrier-transfer efficiency to be modulated. X-Ray absorption near-edge structure (XANES) spectroscopy confirmed that the charge transfer is a crucial factor contributing to the resulting activity of the photoanode. The photoactivity of the photoanodes towards water oxidation was revealed to be governed by both the LUMO energy level and transfer efficiency of the photoinduced charge carriers. Among the studied molecules, a bis-coumarin with benzothiophenyl substituents showed the greatest potential as light absorber for photoelectrochemical water oxidation. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407518 | DOI: | 10.1002/chem.201804829 | SDG/關鍵字: | Charge carriers; Charge transfer; Electrochemistry; Molecules; Oxidation; X ray absorption; X ray absorption near edge structure spectroscopy; Heterocycles; In-situ X-ray absorption spectroscopy; Photo-anodes; Photo-electrochemical oxidations; Photoelectrochemical water oxidation; Photoinduced charge carriers; Small molecules; Small-molecule organic semiconductor; Energy efficiency |
顯示於: | 化學系 |
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