Starburst Triarylamine Donor-Based Metal-Free Photosensitizers for Photocatalytic Hydrogen Production from Water

Abstract

Three metal-free molecular photosensitizers (S1-S3) featuring a starburst triarylamine donor moiety have been synthesized. They show attractive photocatalytic performance in visible light-driven H production from water in their platinized TiO composites. A remarkable H turnover number (TON) of 10 200 (48 h) was achieved in an S1-anchored system.

Panchromatic Sensitization with ZnII Porphyrin‐Based Photosensitizers for Light‐Driven Hydrogen Production

“…Comparisons of the UV/Vis spectra in tetrahydrofuran (THF) solutions of ZnP‐dyad, YD2‐ o ‐C8, and Bodipy‐dye before and after sonication in the presence of platinized TiO 2 , were used to determine the extent of binding of the PS onto the TiO 2 particles (the corresponding spectra are displayed in Figures S20–S24.) The relatively low dye‐loading values (≈40–70 %) as compared to the previous reports were probably owing to the larger molecular size of PSs in this study. In short, the H 2 generation experiments were conducted in aqueous solutions at pH 4.0, with AA (0.5 m ) serving as the hole scavenger.…”

Photocatalytic H2 Production from Water by Metal‐free Dye‐sensitized TiO2 Semiconductors: The Role and Development Process of Organic Sensitizers

“…[58] Such starburst metal-free dyes were applied in DSPs by PoÀ Yu Ho et al for the first time. [59] Three TPA-based dyes S1, S2 and S3 with N-hexyl carbazole group modified on their TPA donors were synthesized ( Figure 25 and Table 1, No. [63][64][65].…”

“…A) Structures of starburst dyes S1-3 and B) corresponding H 2 evolution plots. Reproduced from Ref [59]…”

Organic Dyes based on Tetraaryl‐1,4‐dihydropyrrolo‐[3,2‐b]pyrroles for Photovoltaic and Photocatalysis Applications with the Suppressed Electron Recombination

“…[6] Also, the triphenylamine-based organic dyes show attractive photocatalytic performance in light-driven H 2 production from water with remarkable H 2 turnover number (TON) of 10 200 (48 h). [7] However,w hen the nitrogena tom is incorporated into cyclics as ap art of some electron donors, such as carbazole, indoline, phenothiazine, and so on, just moderate performance can be obtained. It is mainly related to the planar structure of electron donor with extend p system, which can induce dye aggregation and aggravate electron recombination to some extent.…”

“…Until now, the most common used one is triarylamine unit, which contains nitrogen atom as the electron‐rich center, demonstrates the strong electron‐donating property and unique spatial configurations, and the highest conversion efficiency (14.3 %) of the corresponding DSC is achieved with the optimized co‐sensitized system . Also, the triphenylamine‐based organic dyes show attractive photocatalytic performance in light‐driven H 2 production from water with remarkable H 2 turnover number (TON) of 10 200 (48 h) . However, when the nitrogen atom is incorporated into cyclics as a part of some electron donors, such as carbazole, indoline, phenothiazine, and so on, just moderate performance can be obtained.…”