Pushing the limits in photosensitizer-catalyst interaction via a short cyanide bridge for water oxidation

Ghobadi T. G. U., Ghobadi A., Demirtas M., Phul R., Yildiz E., YAĞLIOĞLU H. G., ...Daha Fazla

CELL REPORTS PHYSICAL SCIENCE, cilt.2, sa.2, 2021 (ESCI) identifier identifier

  • 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.