https://scholars.lib.ntu.edu.tw/handle/123456789/611474
標題: | Decoupling pH dependence of flat band potential in aqueous dye-sensitized electrodes | 作者: | Yu Y. Click K.A. Chien S.-C. Sun J. Curtze A. Lin L.-C. Wu Y. LI-CHIANG LIN |
關鍵字: | Dye-sensitized solar cells;Electrodes;Electrolytes;Nickel oxide;Oxide semiconductors;Redox reactions;Aqueous dye;Band edge position;Dye molecule;Flat band potential;Mott-Schottky;PH dependence;Photo-electrochemistry;Relative energies;Phosphorus compounds | 公開日期: | 2019 | 卷: | 123 | 期: | 14 | 起(迄)頁: | 8681-8687 | 來源出版物: | Journal of Physical Chemistry C | 摘要: | When a semiconductor is in contact with an electrolyte, its flat band potential (EFB) is an important quantity for determining band edge positions in photoelectrochemistry. Oxide semiconductors generally have a EFB shift of-59 mV in aqueous solutions when the pH is increased by 1 unit as a consequence of surface deprotonation. Many of the most desirable redox reactions, such as the reduction of CO2 to HCOOH, or water to H2, also show the same dependence on pH due to the involvement of protons. Therefore, pH cannot be used to tune the relative energy alignment between the electrode and the electrolytes. Here, we demonstrate via Mott-Schottky measurement that sensitized NiO with a membrane-inspired design of dye molecule (BH4) can decouple the pH dependence of EFB. The EFB of BH4-sensitized NiO films shows very little to zero change as a function of pH, whereas less hydrophobic dye (P1)-sensitized NiO and the bare NiO follow the Nernst shift with respect to pH. ? 2019 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85064378568&doi=10.1021%2facs.jpcc.9b00710&partnerID=40&md5=5fd36e10689348270bd17cfde31a7198 https://scholars.lib.ntu.edu.tw/handle/123456789/611474 |
DOI: | 10.1021/acs.jpcc.9b00710 |
顯示於: | 化學工程學系 |
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