Pushing the limits in photosensitizer-catalyst interaction via a short cyanide bridge for water oxidation
CELL REPORTS PHYSICAL SCIENCE, cilt.2, sa.2, 2021 (ESCI, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 2 Sayı: 2
- Basım Tarihi: 2021
- Doi Numarası: 10.1016/j.xcrp.2020.100319
- Dergi Adı: CELL REPORTS PHYSICAL SCIENCE
- Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Directory of Open Access Journals
- Ankara Üniversitesi Adresli: Evet
Özet
The realization of high-performance, precious-metal-free, stable, and robust photoanodes for water oxidation is one of the bottlenecks for dye-sensitized water splitting. Herein, we integrate an organic photosensitizer, which absorbs visible light above 500 nm, with a Prussian blue (PB) network to sensitize a visible-light-absorbing semiconductor, WO3. Through comprehensive steady-state and ultrafast transient absorption studies, we show that the coupling of a photosensitizer to a catalyst through a short cyanide bridging group in a PB structure generates appropriate energy levels for an efficient charge transfer from the photosensitizer to the visible-light-absorbing semiconductor. The photoanode retains its structural integrity and high photoelectrochemical activity for at least 2 h of solar irradiation under mildly acidic conditions (pH 3), which reaches around 1.30 mA/cm(2) at 1.23 V-RHE. This work provides a simple recipe with a toolbox that can be extended to a variety of organic photosensitizers and semiconductors.