Abstract
Photocatalytic H2 evolution under a wide visible spectral range is a challenging issue. In this work, we report the synthesis of a novel organic dyad consisting of an indoline–rhodanine π-conjugation with a strong absorption in the green region and a chlorophyll derivative with intense absorbance in the purple and red regions. This synthetic dyad (Dyad) was employed as a photosensitizer in the TiO2-based system for photocatalytic H2 evolution with Pt as the assisting catalyst and ascorbic acid (AA) as the sacrificial reagent. The Dyad-sensitized Pt/TiO2 photocatalyst exhibited a maximum turnover number (TON) of 1044 after 6 h of continuous light irradiation (λ > 400 nm). In comparison, under the same conditions, the TONs of photocatalytic systems based on sole counterpart chlorophyll (Chl) or indoline dye (Ind) were merely 267 or 301, respectively. Moreover, the apparent quantum yield of Dyad/Pt/TiO2 (1.27%) is much higher than those of Chl/Pt/TiO2 (0.37%) and Ind/Pt/TiO2 (0.20%) under 420 nm monochromati...
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